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Att 1 - RFI Amended SWMP
Attachment 1 Amended SWMP Response to Council’s Further Advice – Request for a Change to the Conditions specified within the Decision Notice (Minor Change) 5 Pearl Street & 54 Elm Street, Cooroy 4563 QLD Lot 2 on RP64750 & Lot 2 RP153798 Cooroy Villas PTY LTD (ACN: 86 668 393 182) 20th March 2024
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Page 2
Our Ref: 23098/WB
Your Ref: MCU21/0117.01
Monday, 18 March 2024
Noosa Council
PO Box 141
TEWANTIN QLD 4565
Attention: Andrew Gaffney
RE: Information Request Response
Proposed Townhouse Development at No 5 Pearl Street, Cooroy
In reply to the information request issued by Noosa Council on 11 March 2024, we provide the
following information and response:
Item 1: Provide a revised SMP that incorporates a rainfall intensity increase of 20% and sea
level rise of 800mm to allow for climate change impacts in accordance with AO2.4 and
corresponding Performance Outcome 2 of the Water Quality and Drainage Code.
Response: Refer to the updated Site Based Stormwater Management Plan (23098 – SBSMP – Rev
3) which incorporates a detention tank volume increase of 20% from 27.5kL to a
maximum storage volume of 33.0kL to account for the provision of climate change in
accordance with Noosa Shire Council’s Water Quality and Drainage Code, as
requested.
As the subject site and proposed infrastructure is not in a tidal/flood risk area, it is
expected that the 800mm to allow for sea level rise is irrelevant in this instance.
Item 2: Provide a revised SMP that analyses a more appropriate rainfall data source for the
development site. It is noted that the previous SMP prepared by RECOR used station
40059 Cooroy Composite.
Response: Refer to the updated Site Based Stormwater Management Plan (23098 – SBSMP – Rev
3) incorporating the rainfall station 40059 Cooroy Composite, as requested.
Please contact me if you have any further queries on (07) 3369 8411.
Yours faithfully,
MORGAN CONSULTING ENGINEERS PTY LTD
Henry Morgan MIEAust CPEng RPEQ 11950
Enclosed: 23098 – SBSMP – Rev 3
D:\JOBS\23-Jobs\23098 - 5 Pearl Street, Cooroy\Civil\Correspondence\Letters\23098_RFI Reponse.docx
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SITE BASED STORMWATER
MANAGEMENT PLAN
PROPOSED TOWNHOUSE DEVELOPMENT AT
5 PEARL STREET
COOROY
Prepared for
Altum Property Group
Attention: Rob McCready
Document Reference
23098 - SBSMP/3
Record of Issue:
Issue Status Author Date Checked Date Authorised Date
18 Sep 19 Sep Henry Morgan 20 Sep
0 For Review Rick Cui Darren Yuen
2023 2023 RPEQ 11950 2023
26 Sep 28 Sep Henry Morgan 29 Sep
1 For Approval Rick Cui Darren Yuen
2023 2023 RPEQ 11950 2023
17 Jan 17 Jan Henry Morgan 17 Jan
2 For Approval Rick Cui Winston Boon
2024 2024 RPEQ 11950 2024
18 Mar Henry Morgan 18 Mar Henry Morgan 18 Mar
3 For Approval Winston Boon
2024 RPEQ 11950 2024 RPEQ 11950 2024
This investigation and report has been authorised by Mr Henry Morgan, a Director of Morgan
Consulting Engineers Pty Ltd.
Henry J Morgan RPEQ 11950 Monday, 18 March 2024
D:\JOBS\23-Jobs\23098 - 5 Pearl Street, Cooroy\Civil\Reports\SBSMP\Current\23098 - SBSMP - Rev 3.docx
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23098 - SBSMP/3
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Table of Contents
1 INTRODUCTION ............................................................................................ 3
2 EXISTING SITE.............................................................................................. 4
2.1 The Site ................................................................................................ 4
2.2 Surrounding Area ...................................................................................... 4
3 PROPOSED DEVELOPMENT ............................................................................... 5
4 EXISTING DRAINAGE PATTERNS ......................................................................... 6
4.1 Existing Infrastructure ............................................................................... 6
4.2 Existing Drainage Patterns ........................................................................... 7
4.3 Lawful Point of Discharge............................................................................ 7
5 STORMWATER QUANTITY................................................................................. 8
5.1 Rational Method Assessment ........................................................................ 8
5.1.1 Design Storms ....................................................................................8
5.1.2 Rainfall Intensity ................................................................................8
5.1.3 Times of Concentration .........................................................................8
5.1.4 Runoff Coefficients ..............................................................................8
5.1.5 Peak Flows ........................................................................................9
5.2 Proposed Development Drainage ................................................................... 9
5.3 XPSTORM Modelling ................................................................................... 9
5.3.1 Intensity Frequency Distribution ..............................................................9
5.3.2 Initial and Continuing Losses ................................................................. 10
5.3.3 On-site Detention.............................................................................. 10
5.3.4 Comparison of Peak Flows at Lawful Point of Discharge ................................. 10
6 STORMWATER QUALITY ................................................................................ 12
6.1 State Planning Policy Assessment ................................................................ 12
6.2 Construction Phase ................................................................................. 12
6.3 Operational Phase .................................................................................. 14
6.3.1 Sources of Contaminants ..................................................................... 14
6.3.2 Proposed Treatment Train ................................................................... 15
6.3.3 Pollutant Export Modelling ................................................................... 15
6.3.4 MUSIC Modelling Parameters ................................................................. 15
6.3.5 MUSIC Modelling Results ...................................................................... 16
7 FLOODING ................................................................................................ 18
8 CONCLUSION ............................................................................................. 19
Appendix A DETAILED SITE SURVEY ........................................................................ 20
Appendix B PROPOSED DEVELOPMENT PLANS ............................................................ 21
Appendix C NSC INTERACTIVE MAPPING PLANS .......................................................... 22
Appendix D NSC WATER QUALITY AND DRAINAGE CODE ................................................ 23
Appendix E RATIONAL METHOD CALCULATIONS ......................................................... 24
Appendix F CONCEPT SITE LEVELS AND DRAINAGE PLANS .............................................. 25
Appendix G BOM IFD ......................................................................................... 26
Appendix H XPSTORM PRE DEVELOPMENT RESULTS ..................................................... 27
Appendix I XPSTORM POST DEVELOPMENT RESULTS .................................................... 28
Appendix J XPSTORM POST DEVELOPMENT MITIGATED RESULTS ...................................... 29
Appendix K STORMWATER QUALITY OPERATION AND MAINTENANCE GUIDELINES .................. 30
Appendix L NSC FLOOD HAZARD OVERLAY MAP .......................................................... 31
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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1 INTRODUCTION
This Site Based Stormwater Management Plan (SBSMP) has been prepared for the Proposed
Townhouse Development at 5 Pearl Street, Cooroy.
This SBSMP has been prepared to investigate the effects the development will have on stormwater
quantity and quality.
The objective of this SBSMP is to ensure that there is no adverse impact by the development on
the environmental value of the receiving waters during the construction and operational phases
of the development. This SBSMP will also provide recommendations to ensure that the post-
development peak outflow conditions are not greater than the pre-development peak outflow
conditions.
In order to achieve this objective, this SBSMP:
1. Describes the environmental setting of the development site and precinct;
2. Describes the nature of the proposed development as it relates to stormwater quality;
3. Calculates the peak flows for both pre and post-development conditions;
4. Calculates the detention volume if required to achieve the pre-development outflow in the
post-development state; and
5. Identifies potential sources of contaminants and describes the management techniques
designed to be employed on the site to achieve the water quality objectives.
The proposed development has been assessed against the following guidelines and planning
documents:
1. State Planning Policy 2017 (SPP 2017);
2. Urban Stormwater Quality Planning Guidelines 2010;
3. The Queensland Urban Drainage Manual (QUDM); and
4. Noosa Shire Council Plan 2020;
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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2 EXISTING SITE
2.1 The Site
The subject site, comprised of Lot 2 on RP153798 and Lot 2 on RP64750 is approximately 2,274m2
(0.2274ha) in area. The site is currently occupied by two existing residential dwellings, with
associated sheds and garages. Trees and shrubs are scattered throughout the subject site.
The subject site generally slopes from the southwest (with an approximate height of 107.41m AHD)
towards the northeast (with an approximate height of 105.2m AHD). Existing access to the subject
site is currently provided from Pearl Street and Elm Street.
Refer to Figure 2.1 for a Locality Plan and Appendix A for the Detailed Site Survey.
N
Sapphire Street
Subject Site
Elm Street
Kauri Street
Pearl Street
Figure 2.1 – Locality Plan of Site and Surrounding Area
2.2 Surrounding Area
The site is located within the limits of the NSC region and is classified as Medium Density Residential
Zone. The site is surrounded by residential properties to the north and east and commercial
properties to the west and south. Cooroy Creek lies further west and Cooroy Train Station lies
further south west.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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3 PROPOSED DEVELOPMENT
The Proposed Townhouse Development primarily involves:
1. Three buildings containing a mix of two and three-bed units;
2. Carparking spaces for residents and visitors;
3. Vehicular access via Pearl Street, south of the site; and
4. Dedicated landscaping and planting throughout the site.
Refer to Appendix B for the Proposed Development Plans.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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4 EXISTING DRAINAGE PATTERNS
4.1 Existing Infrastructure
Data obtained from the NSC Interactive Mapping plans and detailed site survey indicate the
following existing drainage infrastructure:
1. Swale drain traversing the northern verge of Pearl Street, south of the site;
2. Swale drain traversing the eastern verge of Elm Street, west of the site;
3. A 300mm dia. to 600mm dia. stormwater line traversing the southern verge of Pearl Street,
south of the site; and
4. A 1350mm dia. to 1800mm dia. stormwater line traversing the eastern boundary of 11 Pearl
Street, east of the site.
Refer to Figure 4.1 for the existing stormwater infrastructure and drainage patterns and Appendix
C for the Noosa Council Interactive Mapping Plans.
N
Subject Site
Ø 1350
Elm Street
Ø 375
Ø 1800
Legend
Pearl Street
Sheet Flow Path
Stormwater Line Ø 300
Stormwater Pit Ø 600 Ø 750
Swale Drain
Headwall
Figure 4.1 – Existing Drainage Paths & Infrastructure
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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4.2 Existing Drainage Patterns
Following an assessment of the existing site conditions and drainage infrastructure we can confirm
that the site has the following drainage patterns:
Roofwater Runoff
1. Roofwater runoff from the site is discharged onto the ground where it sheet flows to the
Environmental Management and Conservation Area, northeast of the site.
Surface Runoff
1. Surface runoff from the site sheet flows to the Environmental Management and
Conservation Area, northeast of the site.
External Catchment
1. There is an external ground catchment contributing runoff from 52 Elm Street, southwest
of the site, which sheet flows through the site to the Environmental Management and
Conservation Area, northeast of the site.
It is noted that all sheet flow traversing across the site becomes concentrated along the eastern
boundary of the site due to an existing bund along this boundary that was constructed as part of
7 Pearl Street. Concentrated flow along this boundary is directed to the Environmental
Management and Conservation Area, northeast of the site.
Refer to Figure 4.1 for a drainage schematic and Appendix A for the detailed site survey plan.
4.3 Lawful Point of Discharge
If the proposed development maintains pre-development flow conditions, the lawful point of
discharge (LPD) is the existing Environmental Management and Conservation Area, northeast of
the site.
In consideration of the site characteristics, surrounding topology and stormwater drainage
infrastructure, the aforementioned proposed lawful point of discharge is considered to be
compliant with the criteria for lawful point of discharge outlined in Section 3.9.1. of QUDM 2017
as per below:
i) The location of the proposed discharge point is under the lawful control of the local
government or other statutory authority from whom permission to discharge has been
received.
ii) The post development discharge will not cause an actionable nuisance, nor environmental
or property damage, as the existing flow characteristics and drainage patterns will be
maintained for the proposed development.
iii) Authority to discharge over affected properties will not be required as the proposed
drainage patterns does not impact surrounding properties adjacent to and downstream of
the subject site.
Refer to Section 5 outlining the Stormwater Quantity aspects of this site and Appendix D for the
Water Quality and Drainage Code.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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5 STORMWATER QUANTITY
A roof and allotment drainage system is to be designed to comply with:
1. AS/NZS 3500.3:2015 - Plumbing and Drainage Part 3: Stormwater Drainage;
2. The Queensland Urban Drainage Manual (QUDM), and;
3. The Noosa Council Engineering Design Standards – Road, drainage and earthworks.
5.1 Rational Method Assessment
The Rational Method has been used to calculate the peak discharges from the site under the
existing (pre-development) and proposed (post-development) conditions.
5.1.1 Design Storms
As defined in the BRC Planning Scheme Policies the following design storms were adopted:
1. Minor Drainage System: 10 year ARI statistical flood (Q10 storm);
2. Major Drainage System: 100 year ARI statistical flood (Q100 storm).
5.1.2 Rainfall Intensity
Rainfall intensities for this study were obtained from the Australian Bureau of Meteorology.
5.1.3 Times of Concentration
Times of concentration (tc) were calculated as defined in the QUDM. Refer to Table 5-1 for the
adopted tc’s and Appendix E for tc calculations.
Table 5-1 – Adopted tc values
Pre development Post development
tc (mins) tc (mins)
10 5.5
5.1.4 Runoff Coefficients
The 10 year runoff coefficient’s (C10) were determined as defined in the QUDM. Refer to Table 5-2
below for the adopted C10 values.
Table 5-2 – Adopted C10 Values
Property State C10
Pre-development 0.75
Post-development 0.85
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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5.1.5 Peak Flows
Refer to Table 5-3 for a summary of the predicted minor and major discharge rates for pre and
post development conditions and Appendix E for the Rational Method calculations.
Table 5-3 – Pre and Post Development Peak Flows
Property State Q1 (m3/s) Q2 (m3/s) Q5 (m3/s) Q10 (m3/s) Q20 (m3/s) Q50 (m3/s) Q100 (m3/s)
Pre development 0.037 0.044 0.066 0.081 0.097 0.122 0.140
Post development 0.051 0.073 0.110 0.132 0.156 0.194 0.218
As shown in Table 5-3, an increase in impervious surface areas will consequently increase
stormwater runoff peak flow rates from the proposed development.
Hence, it is proposed to utilise a series of on-site above ground detention tanks to mitigate the
stormwater runoff of the proposed development prior to discharging to the Lawful Point of
Discharge, northeast of the site.
Refer to Appendix E for the Rational Method Calculations, Appendix F for the Concept Site Levels
and Drainage Plans and Section 6 for the Stormwater Quality Management Plan.
5.2 Proposed Development Drainage
The proposed development drainage intent is as follows (refer to Appendix F for the Concept Site
Levels and Drainage Plan):
Development Catchment:
1. Runoff from the roof catchments will flow via downpipes to aboveground detention tanks
combined with rainwater reuse for mitigation prior to discharging to the lawful point of
discharge, northeast of the site.
2. Runoff from the ground catchment will be directed to the bioretention basin and level
spreader located in the north eastern corner of the site prior to discharging to the lawful
point of discharge, northeast of the site.
External Catchment:
1. Runoff from the external ground catchment, southwest of the site, will be collected by a
positive drainage system and directed to the lawful point of discharge, northeast of the
site.
Refer to Appendix F for the Concept Site Levels and Drainage Plans.
5.3 XPSTORM Modelling
5.3.1 Intensity Frequency Distribution
The IFD data and temporal patterns used for the XPSTORM modelling has been obtained from the
Bureau of Meteorology for the following coordinates:
• Latitude -26.4181
• Longitude 152.9128
Refer to Appendix G for a copy of the BOM IFD data table.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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5.3.2 Initial and Continuing Losses
Initial and continuing losses were approximated based on calibrating the pre-development flows
within XPSTORM to be comparable with Rational Method results. Refer to Table 5-4 below for the
adopted initial and continuing losses.
Table 5-4 – Adopted Initial and Continuing Losses
Designation Initial Loss Continuing Loss
Impervious Areas 0.0 0.0
Pervious Areas 10.0 2.6
5.3.3 On-site Detention
In order for the post-development stormwater discharge conditions to match the pre-development
conditions, it is proposed to incorporate a series of on-site above ground detention tanks with a
maximum storage volume of 27.5kL. The detention tanks will be located adjacent to each roof
catchment within the site.
The proposed OSD tanks will typically have the following properties:
• Available detention depth above reuse component = 1.420 m;
• Low flow orifice diameter = 0.070 m;
• High flow pipe diameter = 0.150 m;
• High flow pipe elevation above reuse component = 1.135 m;
• Total required detention volume = 23.5 kL; and
• Total provided detention volume = 27.5 kL.
The detention tanks will be designed to contain all flows up to a Q20 storm event from the roof
catchment and will mitigate flows at or less than pre-development for all flows up to a Q100 storm
event.
Refer to Appendix F for the Concept Siteworks and Drainage Plan which details the proposed on-
site detention system.
5.3.4 Comparison of Peak Flows at Lawful Point of Discharge
The pre-development and post-development mitigated peak mean/median flow rates were
compared for the catchment and are shown in Table 5-5 below.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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Table 5-5 - Comparison of Peak Flows
XPSTORM XPSTORM XPSTORM XPSTORM
XPSTORM Total
Post-development Post-development Post-development Total Post-
ARI Pre-development
Flows into Tanks Bypass Flows (Un - Flows from Tanks development Flows
(years) Flows (Catchment)
3 (Un -Mitigated) Mitigated) (Mitigated) (Mitigated)
(m /s)
(m3/s) (m3/s) (m3/s) (m3/s)
1 0.040 0.038 0.021 0.019 0.040
2 0.047 0.043 0.024 0.021 0.046
5 0.069 0.057 0.036 0.026 0.062
10 0.083 0.064 0.043 0.029 0.072
20 0.095 0.073 0.050 0.039 0.089
50 0.117 0.084 0.070 0.039 0.109
100 0.132 0.092 0.086 0.039 0.125
As can be seen, the XPSTORM pre-development results are comparable to Rational Method for all
storm events, as they are generally within 10% to the Rational Method results. Therefore, the results
show that a reasonable validation in peak flows has been achieved from the XPSTORM model when
compared to Rational Method and is considered acceptable in assessing for mitigation of post
development flows.
Subsequently, the XPSTORM hydraulic modelling results have demonstrated that the proposed
mitigation implemented will maintain pre-development flows (or less) for all design storms at the
LPD located northeast of the subject site.
To address the Water Quality and Drainage Code Performance Outcome PO2 design allowance for
climate change impacts, it is recommended that the OSD storage volume be increased by 20%, from
an initial capacity of 27.5kL to a revised capacity of 37.5kL, to address climate change
considerations. This adjustment to the proposed maximum tank volume for the proposed
development is deemed to be an acceptable outcome to address AO2.4.
The modified OSD tanks will now have the following properties:
• Available detention depth above reuse component = 1.820 m;
• Low flow orifice diameter = 0.070 m;
• High flow pipe diameter = 0.150 m;
• High flow pipe elevation above reuse component = 1.640 m;
• Total required detention volume = 28.20 kL (23.5 kL + 20%); and
• Total provided detention volume = 37.5 kL (5 x 7.5kL).
Refer to Appendix H for the pre-development XPSTORM results, Appendix I for the post-
development XPSTORM results and Appendix J for the XPSTORM post-development mitigated
results.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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6 STORMWATER QUALITY
The following section of the report will outline the potential contaminants and proposed solutions
to be incorporated during the construction and operational phases of the proposed development.
6.1 State Planning Policy Assessment
The purpose of this sub section is to determine if State Planning Policy (SPP 2017) stormwater
quality requirements, as set out by the Department of Environment and Resource Management, will
be triggered for this development. Refer to Table 6-1 for the State Planning Policy Checklist for
stormwater quality.
Table 6-1 – State Planning Policy Checklist
Material Change of Use (MCU) Y/N?
MCU for an urban purpose that involves premises ≥ 2500m 2 N
AND
Will result in 6 or more dwellings
Y
OR
Will result in impervious area greater than 25% of the net developable area.
Y
The development has been assessed against the latest State Planning Policy 2017 (SPP 2017). The
proposed development will entail the material change of use for urban purposes, which will involve
a land less than 2,500m2. Consequently, State Planning Policy 2017 (SPP 2017) is not triggered.
However, in accordance with Performance Outcome PO6 outlined in the Water Quality and
Drainage Code (Noosa Plan 2020), all stormwater runoff is treated to achieve maximum removal
of nutrients, gross pollutants and suspended solids as determined by cost to efficiency ratios.
Hence, tertiary stormwater quality treatment is warranted for this development in accordance
with the requirements of Noosa Shire Council.
6.2 Construction Phase
Sediment generated during the construction phase shall be dealt with in accordance with an
Erosion and Sediment Control Plan and kept on site during the construction phase.
Erosion and Sediment Control (ESC) Measures such as silt fences, diversion drains, drainage
structure protection and dust control (clearing) will be implemented. Silt fences are to be erected
along the boundary of the site and around the construction area. These fences are to be cleaned
by the contractor when the capacity is reduced by 25%. Where possible, disturbance to the existing
surface is to be limited to the immediate work area. The existing ground cover is not to be stripped
until the contractor is ready for earthworks to begin.
Stockpiles and construction materials are not permitted to be stored within the road reserve and
should be contained using silt fences. Diversion drains are to be provided at upstream catchments
to reduce flows to earthworks areas. In any areas where flows could enter adjacent properties
temporary stabilisation is to be provided.
All ESC measures are to be provided as soon as earthworks have commenced and staged to suit
construction. The contractor is responsible for this action. A temporary construction exit is to be
located at each entry point to the site and will be determined based on the stage of works being
completed. The contractor is to ensure all dust tracked onto surrounding roads is immediately swept
to remove silt/dust.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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All new stormwater pits are to be protected from sediment infiltration by wrapping new pits and
grates in geofabric or covering appropriately with timber board. Silt fences are to remain in place
during the maintenance period until the site is established (80% ground cover).
Potential sources of contaminants identified for the construction phase of the development are
outlined in Table 6-2 together with proposed stormwater quality improvement devices,
management and maintenance procedures.
Table 6-2 - Potential Contaminants and Proposed Treatments
Proposed Treatment
Management /
Pollutant Potential Source Device and Maintenance
Maintenance Procedures
Procedure
Sediment & Excavated material, fill Provision of sediment and Sand filled filter socks.
Eroded material, exposed silt barriers to the site Removal of excess
material ground, stockpiles of drainage entry and exit sand/silt build-up at
material. points. regular intervals and
after every storm.
Dust Stockpiles of material, Covering the material or Coverage of material
exposed ground. wetting it down at with plastic, geotextile,
regular intervals. surface binding agents or
regular watering.
Litter Refuse generated by Construction waste is to Industrial bin is to be
staff. be cleaned off the site provided within the
area and disposed of into construction area - to be
an industrial bin then emptied on at least a
removed by a refuse weekly basis.
collection contractor.
Concrete Washing of concrete Provision of a closed area Liquids to be removed by
trucks/tools to remove onsite for washing off of a waste collection
wet/unused concrete. concrete slurries. contractor. Solids to be
placed into a refuse bin.
Surfactants Washing down operations No cleaning of vehicles Monitoring & prevention
(detergents) on hardstand area using will be permitted on site.
detergents.
Chemical Typically this may occur Where spills occur, the A temporary containment
(Paints, due to spillage of containment area is to area. This is to be
thinners etc.) product. stop escape. The impermeable and of a
material is to be treated size to permit
(as required) and mixing/transfer, and
removed and cleaned by with a storage volume of
a licensed contractor. twice the largest
Minor spillage outside container used.
this area shall be cleaned Treatment of spills is to
up with cloths and occur on site. No
disposed of to waste via discharge of treated
the industrial bin. water to the stormwater
system is to occur
without council approval.
Incidents are to be
reported to the EPA.
Wastewater Spillage from the A licensed contractor No leakage is to be
relocation of the existing shall remove any residue permitted to enter the
sewerage reticulation. sewage from unused groundwater or discharge
pipes and contaminated to the stormwater
soils are to be disposed system.
of via the industrial bin.
Site Based Stormwater Management Plan
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6.3 Operational Phase
Water quality objectives (WQO’s) for South East Queensland as set out in State Planning Policy 2017
(SPP 2017) should be achieved by identifying and adopting best practise techniques in accordance
with the abovementioned guidelines. Refer to Table 6-3 for the target WQO’s.
Table 6-3 – Minimum Mean Annual Load Reductions
Minimum Mean Annual
Contaminant
Load Reductions
Total Suspended Solids (TSS) ≥ 80%
Total Phosphorus (TP) ≥ 60%
Total Nitrogen (TN) ≥ 45%
Gross Pollutants (GP) ≥ 90%
6.3.1 Sources of Contaminants
Potential sources of contaminants and stormwater quality improvement devices identified for the
operational phase of the development are outlined in Table 6-4.
Table 6-4 - Sources of Contaminants
Pollutant
Target Pollutant Type Acceptable Treatment Examples
Size
Primary Screening of gross Litter baskets, swales, buffer strips,
>5000um
Pollutants pollutants GPT’s, underground detention
Sedimentation of
Secondary 125um -
coarse to medium Swales, sedimentation basins, ponds
Pollutants 5000um
sediment
Underground detention, constructed
Enhanced
10um – wetland macrophyte zones, other bio
sedimentation of fine
125um technologies, proprietary tertiary
particulates
stormwater treatment dvices
Tertiary Adhesion and filtration Constructed wetland macrophyte zones,
0.45um –
Pollutants of very fine / colloidal other bio technologies, proprietary
10um
sediment tertiary stormwater treatment dvices
Biological uptake of Constructed wetland macrophyte zones,
<0.45um
dissolved particles other bio technologies
Site Based Stormwater Management Plan
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6.3.2 Proposed Treatment Train
The proposed treatment train has been modelled using the following methodology:
Proposed Development Catchment
1. Roofwater from the proposed roof catchments will flow via downpipes to above ground
rainwater tanks for treatment with overflow to an internal drainage network.
2. Surface runoff from the proposed ground catchment will be directed to an end of line
bioretention basin for treatment, which is located in the north eastern corner of the site.
All runoff described above will then discharge to the legal point of discharge. The Concept Site
Levels and Drainage Plans of the proposed internal drainage network detailing the treatment train
assets are included in Appendix F. Refer to Table 6-5 for details of the proposed treatment train
assets.
Table 6-5 - Proposed Treatment Assets
Treatment Treatment
Description
Level Asset
Rainwater Reuse
Total of 12.5kL located adjacent to each proposed
Primary/ Tanks (Landscape
building, irrigating an area of 627m2 and servicing
Secondary Irrigation, Toilets
toilets and laundry for all units.
and Laundry)
Primary/ • 10m2 Total Filter Area
Secondary/ Bioretention Basin • 0.4m Filter Media Depth
Tertiary • 0.1m Extended Detention Depth
Refer to Appendix K for the Stormwater Quality Operational Management and Maintenance
Guidelines.
6.3.3 Pollutant Export Modelling
Following the definition of water quality objectives for the site and an assessment of the treatment
options suitable for the development, the most appropriate treatment scheme for the site was
identified. The impact of the stormwater management strategy on the quality of stormwater runoff
discharged from the site has been assessed using the pollutant export model, Model for Urban
Stormwater Improvement Conceptualisation (MUSIC).
6.3.4 MUSIC Modelling Parameters
The MUSIC model was set up in accordance with the Water-By-Design MUSIC Modelling Guidelines
for South East Queensland to the parameters listed in Table 6-6. Refer to Figure 6.1 for source
node areas in the proposed development area.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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Page 16
Table 6-6 – MUSIC Parameters
Parameter Data Used
Rainfall Data 40059 Cooroy Composite 1973 to 1983
Modelling Timestep 6 minutes
Routing No routing drain links were adopted
Table 6-7 – Catchment Runoff Generation Parameters
Parameter Residential Catchment
Rainfall Threshold 1
Soil Storage Capacity (mm) 18
Initial Storage Capacity (% capacity) 10
Field Capacity (mm) 80
Infiltration Capacity Coefficient a 243
Infiltration Capacity Coefficient b 0.6
Initial Depth (mm) 50
Daily Recharge Rate (%) 0
Daily Baseflow Rate (%) 31
Daily Deep Seepage Rate (%) 0
6.3.5 MUSIC Modelling Results
Refer to Figure 6.1 for a print screen schematic of the MUSIC model for the proposed development
and Figure 6.2 for the annual pollutant loads that will be discharged from the site for the proposed
development.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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23098 - SBSMP/3
Page 17
Figure 6.1 - MUSIC Model Print Screen Schematic
Figure 6.2 - MUSIC Modelling Results
The modelling results show that the pollutant reduction objectives are met for all contaminants
given in Section 6.
Should operational requirements change, this plan is required to be amended to suit. Substantial
changes may require resubmission to the local authority. Following completion of construction, this
plan is to be incorporated into the total-site management practices.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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7 FLOODING
Information from the Noosa Shire Council Flood Hazard Overlay Map confirms that the site is
unaffected by flooding and inundation. As the subject site and proposed infrastructure is not in a
tidal/flood risk area, it is expected that the 800mm to allow for sea level rise is irrelevant in this
instance.
Refer to Appendix L for the NSC Flood Planning Control Property Report.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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Page 19
8 CONCLUSION
The Proposed Townhouse Development at 5 Pearl Street, Cooroy has been assessed for its impact
on the quantity and quality of stormwater drainage.
The lawful point of discharge is the existing Environmental Management and Conservation Area,
northeast of the site.
On-site detention (OSD) is warranted for the proposed development. The Water Quality and
Drainage Code Performance Outcome PO2 design allowance for climate change impacts has also
been addressed.
Sediment generated during the construction phase shall be dealt with in accordance with an
Erosion and Sediment Control Plan to be kept on site during the construction phase.
The proposed development requires tertiary stormwater quality treatment in accordance with the
requirements of Noosa Shire Council. Rainwater reuse and bioretention end-of-line treatment will
be incorporated into the proposed development to meet the prescribed water quality objectives.
The subject site is unaffected by flooding.
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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23098 - SBSMP/3
Page 20
APPENDIX A
DETAILED SITE SURVEY
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
Page 23
Skyline Surveyors
Suite 11C
Brightwater Corporate Centre PHONE
07 5493 4877
69 Attenuata Drive
MOUNTAIN CREEK QLD 4557
E: [email protected]
W: www.skysurv.com.au
Page 24
23098 - SBSMP/3
Page 21
APPENDIX B
PROPOSED DEVELOPMENT PLANS
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
Page 25
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23098 - SBSMP/3
Page 22
APPENDIX C
NSC INTERACTIVE MAPPING PLANS
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
Page 27
Noosa Shire Council does not warrant the accuracy of information in this publication and any person using or relying upon such information does so on the basis that Noosa Shire Council shall bear no responsibility or liability 20/09/2023
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Page 23
APPENDIX D
NSC WATER QUALITY AND DRAINAGE CODE
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
Page 29
Water Quality and Drainage Code
Noosa Council Plan July 2020
Performance and Acceptable Outcomes Table
Version: 2020
Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
Stormwater Drainage Design
PO1 AO1 RO1
The development and its stormwater A stormwater management plan is prepared The proposal complies. Refer to the
management system is planned and consistent with PSP6 Engineering Design Site Based Stormwater Management
designed having regard to: Standards - Roads, drainage and earthworks. Plan (SBSMP) report prepared by
(a) the natural features of the site; MCE.
(b) the need to avoid impacts and potential
risks to ecologically important areas;
(c) the likely effectiveness of erosion and
sediment control and stormwater ✓
drainage measures during rainfall
events during and post construction;
and
(d) the need to protect environmental
values and water quality of receiving
waters both during and post
construction
PO2 AO2.1 RO2.1
Stormwater drainage infrastructure is Stormwater drainage planning, design and The proposal complies. All stormwater
planned, designed and construction is in accordance with PSP6 design will comply with the PSP6
Engineering Design Standards –
constructed to:
(a) incorporate allowance for increased
Engineering Design Standards - Roads,
drainage and earthworks and the latest version
✓ Roads, drainage and earthworks and
flood risk and tidal inundation through of the Queensland Urban Drainage Design the latest version of the Queensland
pipework as a result of cilmate change Manual. Urban Drainage Design Manual.
and sea level rise; AO2.2 RO2.2
(b) ensure the development is adequately The stormwater drainage system connects to a Refer to the SBSMP prepared by
drained; and lawful point of discharge in accordance with ✓ MCE for the lawful point of discharge.
(c) ensure stormwater is managed and PSP6 Engineering Design Standards - Roads,
lawfully discharged without altering drainage and earthworks
stormwater drainage characteristics AO2.3 RO2.3
external to the site. Stormwater flows discharging from the The proposal complies. Above ground
development are demonstrated to be ✓ detention tanks will be utilised to
consistent with pre-development mitigate flows prior to discharge to the
characteristics. legal point of discharge. Refer to the
SBSMP prepared by MCE.
1
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Performance and Acceptable Outcomes Table
Version: 2020
Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
AO2.4 RO2.4
Development provides for the management of The proposal complies. The
stormwater to incorporate appropriate development provides for the
allowance for climate change impacts
(including rainfall intensity and sea level rise),
✓ management of stormwater to
incorporate appropriate allowance for
in accordance with PSP6 Engineering Design climate change impacts in accordance
Standards – Roads, Drainage and Earthworks. with PSP6. Refer to the SBSMP
prepared by MCE.
PO3 AO3.1
Stormwater drainage infrastructure conveys Stormwater drainage infrastructure meets the
run-off in a manner that allows roads to desired standards of service for roads
deliver desired standards of service functionality set out in PSP6 Engineering N/A
appropriate to the local conditions and local Design Standards - Roads, Drainage and
stormwater drainage characteristics. Earthworks.
PO4 AO4.1 RO4.1
Stormwater infrastructure is compatible with The location, design and construction of Refer to RO2.1.
existing infrastructure, allows for easy stormwater drainage structures is in
access for the ongoing maintenance by
Council, is cost effective across its design
accordance with PSP6 Engineering Design
Standards - Roads, drainage and earthworks.
✓
life
AO4.2
Where infrastructure is located on private land
an easement is dedicated over the
infrastructure in accordance with PSP6 N/A
Engineering Design Standards - Roads,
drainage and earthworks.
AO4.3 RO4.3
Any alterations or repairs to infrastructure as a The proposal complies.
result of the development are made at no cost ✓
to Council.
AO4.4 RO4.4
Development avoids stormwater inflow and The proposal complies. Stormwater
infiltration to the sewer infrastructure network. ✓ will be designed to avoid inflow and
infiltration into the sewer infrastructure
network.
1
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Performance and Acceptable Outcomes Table
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Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
AO4.5 RO4.5
Stormwater infrastructure is designed to The proposal complies.
minimise maintenance costs and the ✓
requirement for specialized equipment for
maintenance techniques.
PO5 AO5.1
Stormwater drainage infrastructure is Stormwater drainage infrastructure avoids
aligned to avoid crossing waterways, crossing waterways, wetlands drainage lines N/A
wetlands, drainage lines and ecological and ecologically important areas or follows the
important areas, or where it is demonstrated edge of existing disturbed areas.
this is unavoidable, disturbed areas are AO5.2
reinstated and revegetated upon completion Stormwater drainage infrastructure avoids
of works. crossing waterways, wetlands drainage lines N/A
and ecologically important areas or follows the
edge of existing disturbed areas.
AO5.3
Temporary vehicular crossings of waterways
must be designed and constructed to be N/A
consistent with the current International
Erosion Control Association Best Practice
Book Series.
Stormwater quality and protection of receiving waters
PO6 AO6.1 RO6.1
Development is located, designed, Stormwater runoff discharging into High The proposal complies.
constructed and operated to protect and Ecological Value waters as a result of
enhance environmental values and water
quality of waterways, wetlands, lakes,
development causes no increase in gross
pollutants, total suspended solids, total
✓
ground waters and drainage systems. phosphorous or total nitrogen compared to
a pre-development scenario.
Editor’s note: Environmental values of
waters and water quality objectives are AND
prescribed in Schedule 1 of the AO6.2 RO6.2
Environmental Protection (Water) Policy All stormwater runoff is treated to achieve The proposal complies. A bio-
2009 and are identified on the State maximum removal of nutrients, gross retention system will be incorporated
Planning Policy Interactive Mapping System pollutants and suspended solids as determined into the drainage design to achieve
1
Solution: ✓ Acceptable Solution Page 3 of 10
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Water Quality and Drainage Code
Noosa Council Plan July 2020
Performance and Acceptable Outcomes Table
Version: 2020
Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
by cost to efficiency ratios. (e.g. bioretention the target pollutant reduction loads.
basins must be sized to Refer to the SBSMP prepared by
achieve at least 80% reduction in total MCE.
suspended solids, 60% reduction in total
phosphorous, 45% reduction in total nitrogen
✓
and 90% reduction in gross pollutants >5mm)
OR
AO6.3
Developments achieve a minimum 3 drop
rating consistent with the Water by Design
Living Waterways Scoring Guide (Healthy
Land and Water).
Editor’s note— PSP6 Engineering Design N/A
Standards - Roads, Drainage and Earthworks
provides guidance on stormwater design and
modelling requirements
PO7 AO7.1 RO7.1
Water quality treatment systems use natural Water quality treatment systems are designed The proposal complies.
processes and to be integrated into the landscape consistent
materials, whenever possible, and are with the technical design guideline published
integrated into development by Healthy Land and Water Water by Design
to enhance biodiversity and landscape for the ✓
benefits feature. (eg. For Bioretention Basins:
Bioretention Technical Design Guidelines
(October 2014) and for Wetland Systems the
Wetland Technical Design Guideline (May
2017).
PO8 AO8.1
Water quality treatment infrastructure to be Detailed life cycle costing is provided for the
N/A
dedicated as public assets are proven to be entire treatment train system including
suitable for its use and of a cost replacement costs of asset parts.
effective and efficient standard AO8.2
Treatment systems dedicated as public assets
1
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Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
are designed to minimise maintenance,
renewal and adaption costs and the
N/A
requirement for specialised equipment,
material or maintenance
techniques.
AO8.3
Vegetated stormwater management systems
to be dedicated as public assets are
established and maintained during the
maintenance period to ensure optimal N/A
vegetated growth and that the functional
elements of the system achieve the design
function at the end of the maintenance period.
PO9 AO9.1 RO9.1
Treatment systems are designed to Free draining inlets and outlets are provided to The proposal complies. The proposal
eliminate or minimise health, safety and ensure that waters do not pond for more than ✓ stormwater treatment system will be
aesthetic hazards, including risks associated 24 hours. designed to be free draining.
with insect breeding, odour and public AO9.2 RO9.2
safety. Developments are designed to eliminate The proposal complies. Retaining
retaining walls in excess of 0.8m for any water ✓ walls do not exceed 0.8m.
quality treatment device.
Hydraulic and Waterway Stability
PO10 AO10 RO10
Development prevents increased bed and The development is designed to: The proposal complies. Refer to the
bank erosion and (a) limit the peak 1 year ARI event discharge SBSMP prepared by MCE.
sedimentation in receiving waterways by within the receiving waterway to the pre-
avoiding changes in low development peak 1 year discharge;
rate, peak flow run-off and flow duration. (b) maximise pervious areas by using
pervious alternatives for otherwise
impervious areas wherever possible;
(c) provide for capture and reuse of
stormwater for non-potable purposes for
gardening, toilet flushing, laundry and hot
water supply uses; ✓
(d) incorporate appropriate detention features;
1
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Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
and
(e) incorporate natural channel design
principles.
Editor’s note: The Sustainable Building
Design Code includes requirements for
stormwater capture and reuse.
PO11 AO11.1
Water sensitive urban design principles are The design and construction of a natural
applied to achieve multifunctional design of channel or natural channel rehabilitation works
waterways, wetlands and drainage lines that are in accordance with the Natural Channel N/A
provide for: Design Guidelines (Brisbane City Council)
(a) stormwater conveyance that uses having regard to local topography, geology and
natural channel design; geomorphology.
(b) protection of landscape features and AO11.2
ecological important areas including Landscape features, plant species and habitat
terrestrial and aquatic habitat; types used in stormwater conveyance N/A
(c) aesthetic and passive recreation channels are complementary to the local
values; context and natural waterways
(d) flood management and conveyance of AO11.3
external catchment stormwater through Bank and bed stability and planting densities
the development; result in a stable channel over the long term N/A
(e) landscaping that incorporates local and minimal potential for pest plant species.
native species; and
AO11.4
(f) bed and bank stability
Water Sensitive Design measures are
incorporated into the development, as detailed
in the document Water Sensitive Designs
small improvements, new ideas, concepts and N/A
sketch designs for stormwater filtration
systems (Healthy Waterways Water by
Design).
AO11.5
Floodplain management is designed in
accordance with the Framework for the
Integration of Flood and Stormwater N/A
Management into Open Space published by
1
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Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
Healthy Waterways Water by Design (version
current at the time of development
application).
PO12 AO12.1
Development protects in-stream ecology by Where run-off from or within the site passes
maintaining pre development low flow through or drains to natural channels,
discharge regimes and maintaining fish waterways or wetlands, development protects
passages. in steam ecology by maintaining pre-
development low flow discharge regimes in N/A
accordance with the frequent flow
management objectives in PSP6 Engineering
Design Standards - Roads, drainage and
earthworks
AO12.2
Instream structures such as roads, bridges,
culverts, and other stormwater infrastructure N/A
do not cause barriers to fish passage and
facilitate the movement of terrestrial and
aquatic fauna along waterway corridors
AO12.3
Benthic substrate retains a continuous grade
with the direction of flow consistent with the N/A
natural bed profile.
PO13 AO13.1
Development is designed and constructed to The location and form of stormwater discharge
maintain surface and ground water balances points do not alter the pre-development N/A
that sustain the environmental values of hydrology of receiving surface water or
water dependent ecosystems, including groundwater.
downstream aquatic, riparian, wetland and AO13.2
terrestrial ecosystems. Developments located on groundwater
recharge or discharge areas are designed and
managed in accordance with a groundwater
recharge and discharge management plan
prepared by a suitably
experienced and qualified groundwater
hydrologist. The groundwater recharge or
1
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Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
discharge must demonstrate that the N/A
development does not affect groundwater
balances beyond the property boundaries
Editor's Note— PSP6 Engineering Design
Standards - Roads, drainage and earthworks
provides guidance on prepare a groundwater
recharge and discharge plan.
Construction and establishment of stormwater management systems
PO14 AO14.1 RO14.1
Construction methods provide for An erosion and sediment control plan prepared An Erosion and Sedimentation Control
appropriate controls to avoid entry and in accordance with the International Erosion Plan shall be prepared (prior to
transport of litter, sediment, and associated Control Association Best Practice Books commencement of construction) and
prescribed water contaminants into receiving demonstrates that the capture and release of maintained for the management of the
waters. stormwater achieves the design objectives sediment laden stormwater during the
listed in Table A: Construction phase – construction phase in accordance with
Editor's note— Water contaminants are stormwater management design objectives IECAs Best Practice guidelines.
prescribed in the of the State Planning Policy (Appendix 2). ✓
Environmental Protection Act 1994
Editor’s note— PSP6 Engineering Design
Standards - Roads, drainage and earthworks
provides guidance on requirements for
preparing an Erosion Management Plan.
AO14.2 RO14.2
Construction works are designed and Unnecessary disturbance to soil shall
managed to restrict the extent of clearing and be avoided and soil surfaces shall
soil exposure to the minimum necessary for
access, and safe construction at any one time
✓ remain stabilized.
AO14.3 RO14.3
For buildings: The proposal complies. Refer to
(a) upstream runoff is diverted around the RO14.1.
construction site;
(b) sediment barriers are provided downslope
of disturbed areas to prevent sediment
washing into gutters, drains and
1
Solution: ✓ Acceptable Solution Page 8 of 10
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Performance and Acceptable Outcomes Table
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Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
waterways , wetlands or drainage lines
either on or off the site; and
(c) temporary or permanent downpipes are ✓
connected to the stormwater system
before laying the roof; or
(d) localised erosion is avoided by directing
flow from downpipes over non-erosive
areas.
AO14.4 RO14.4
Chemical flocculants used as part of an The proposal complies. Refer to
erosion and sediment control plan do not harm ✓ RO14.1.
the environmental values within receiving
waters.
AO14.5 RO14.4
Appropriately sized litter containment areas, The proposal complies. Refer to
with provision for sorting recyclables are ✓ RO14.1.
provided for the type of litter expected to be
generated onsite.
Wastewater management and effluent disposal
PO15 AO15
Development does not discharge Wastewater (non-sewage) generated from the
wastewater unless it can be demonstrated to development is collected and contained on-
not compromise environmental values of site, and is;
waters and water quality objectives. (a) lawfully disposed to sewer; or
(b) transferred off-site for treatment/disposal
Editor’s Note—Environmental values of to an appropriately
waters and water quality objectives are licenced facility;
prescribed in Schedule 1 of the (c) reused on-site in a closed-cycle irrigation
Environmental Protection (Water) Policy scheme, industrial processes, washing or
2009. cleaning or other purpose; or N/A
(d) treated to meet the drinking water supply
environmental values prior to release.
Editor’s Note—The Plumbing and Drainage
Act 2003 sets out requirements for wastewater
1
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Performance Outcomes Acceptable Outcomes Solution1 Comments Council Use
management.
PO16 AO16
On-site effluent treatment and disposal An onsite effluent system and disposal area is:
systems are designed, constructed and (a) not located on a slope greater than 1 in
managed to not compromise the (10%);
environmental values of waters and water (b) not located at or below the 1% annual
quality objectives. exceedance probability (AEP flood event);
(c) not located within a riparian buffer area
mapped on a Biodiversity, Waterways and
Wetlands Overlay Map; and
(d) setback 400 metres minimum from the full
supply level of Lake Macdonald.
Editor’s Note—The Plumbing and Drainage
Act 2003 sets out requirements for on-site N/A
effluent treatment and disposal. The
Queensland Plumbing and Wastewater Code
and associated
guidelines are used to confirm the suitability of
each site to accommodate an on-site
sewerage facility; or where a centrally located
group collection treatment system is proposed,
confirmation as to the suitability of the
designated site to accommodate the onsite
sewerage facility. Additionally, where the
combined total peak design capacity of effluent
treatment is less than 21 equivalent persons,
the design of the system achieves a low to
medium risk classification in accordance with
Seqwater’s Land Use Risk Tool for onsite
sewerage facilities
1
Solution: ✓ Acceptable Solution Page 10 of 10
A/S Alternative Solution \\mcedc01\DATA\JOBS\23-Jobs\23098 - 5 Pearl Street, Cooroy\Civil\Reports\SBSMP\Working\Appendices\NSC Water Quality and Drainage Code 2020.docx
N/A Not applicable to this proposal Job: 23098
Rev: 1
Site Address: 5 Pearl Street, Cooroy 18/03/2024
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23098 - SBSMP/3
Page 24
APPENDIX E
RATIONAL METHOD CALCULATIONS
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
Page 40
Rational Method Peak Flow Calculations
Job No: 23098 MORGAN CONSULTING
Job Type: Proposed Townhouse Development ENGINEERS PTY LTD
Address: 5 Pearl Street, Cooroy 1 GREAT GEORGE STREET
Council: NSC PADDINGTON QLD 4064
IFD Data: 26.4125 (S),152.9125 (E) Minor Storm: Q10 Designed: RC
1
I10 70mm/hr Major Storm: Q100 Checked: HM
Pre Development Post Development
Time of Concentration
Standard Inlet Time Standard Inlet Time
Standard Inlet Time mins Standard Inlet Time 5 mins
Sheet Flow (Friends Equation)
Sheet flow length (L) 64 m Pipe Flow
roughness (n) 0.03 short grass Flow distance 68.26 m Pipe
Fall of NSL 2.21 m Fall of channel m
Slope of Surface (S) 3.5 % Flow Velocity 2.5 m/s
total 10.0 mins total 0.5 mins
Concentrated Overland Flow Concentrated Overland Flow
Flow distance 0 m Flow distance m
velocity 0.7 m/s velocity 0.7 m/s
mins 0.0 mins mins 0.0 mins
Surface type multiplier 3.0 Surface type multiplier 4.0
total 0.0 mins total 0.0 mins
Total tc 10.0 mins Total tc 5.5 mins
Runoff Volume Calculations
Name Area (ha) tc fi C10 Name Area (ha) tc fi C10
0.227 0.24 0.75 0.227 0.74 0.85
Total 0.227 10.0 0.75 Total 0.227 5.5 0.85
Frequency Frequency
ARI Cy Iy Qy ARI Cy Iy Qy
Factor A (Ha) Factor A (Ha)
(years) (Fy*C10) (mm/h) (m3/s) (years) (Fy*C10) (mm/h) (m3/s)
(Fy) (Fy)
3 mth 0.018 3 mth 0.025
1 0.800 0.599 97 0.227 0.037 1 0.800 0.679 118 0.227 0.051
2 0.850 0.636 132 0.227 0.053 2 0.850 0.721 159 0.227 0.073
5 0.950 0.711 148 0.227 0.066 5 0.950 0.806 216 0.227 0.110
10 1.000 0.749 172 0.227 0.081 10 1.000 0.848 247 0.227 0.132
20 1.050 0.786 196 0.227 0.097 20 1.050 0.891 277 0.227 0.156
50 1.150 0.861 225 0.227 0.122 50 1.150 0.975 316 0.227 0.194
100 1.200 0.898 247 0.227 0.140 100 1.200 1.000 345 0.227 0.218
Page 1 of 1 19/03/2024
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23098 - SBSMP/3
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APPENDIX F
CONCEPT SITE LEVELS AND DRAINAGE PLANS
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
Page 42
P: (07) 3369 8411
F: (07) 3369 1893
E : [email protected]
© Morgan Consulting Engineers
This drawing is not to be copied,
retai ned or used without the
permission of the copyright holder.
1 GREAT GEORGE STREET
PADDINGTON Q LD 4 0 6 4
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23098 - SBSMP/3
Page 26
Appendix G
BOM IFD
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
Page 44
Copyright Commonwealth of Australia 2016 Bureau of Meteorology (ABN 92 637 533 532) IFD Design Rainfall Intensity (mm/h) 29-Aug-23 Issued: Location La5 Pearl Stre Cooroy Requested Latitude Nearest gri Latitude Duration 1 min 2 min 3 min 4 min 5 min 10 min 15 min 20 min 25 min 30 min 45 min 1 hour 1.5 hour 2 hour 3 hour 4.5 hour 6 hour 9 hour 12 hour 18 hour 24 hour 30 hour 36 hour 48 hour 72 hour 96 hour 120 hour 144 hour 168 hour Duration in UO BWN PR 10 15 20 25 30 45 60 90 120 180 270 360 540 720 1080 1440 1800 2160 2880 4320 5760 7200 8640 10080 63.20% 165 141 132 126 120 97.3 82.3 71.8 64 58 46 38.7 30.2 25.3 19.8 15.4 13 10.2 8.54 6.63 5.51 4.75 4.19 3.42 2.53 2.04 1.71 1.49 1.33 -26.4181 Longitude 26.4125 (S)Longitude 152.9125 (E) 50% 186 159 149 142 135 110 92.9 81 72.2 65.4 51.9 43.8 34.3 28.8 22.6 17.7 15 11.8 9.95 7.78 6.48 5.6 4.95 4.04 2.99 2.4 2.02 1.75 1.56 152.9128 Annual Exceedance Probability (AEP) 20% 250 216 203 192 183 148 125 109 97.1 88.1 70.3 59.5 47 39.8 31.5 25.1 21.4 17.1 14.6 11.5 9.7 8.43 7.48 6.15 4.58 3.67 3.08 2.66 2.35 10% 293 256 239 226 215 172 145 127 113 103 82.6 70.2 55.8 47.4 37.8 30.3 26 20.9 17.9 14.2 12 10.5 9.35 7.72 5.78 4.64 3.89 3.36 2.97 5% 333 295 275 259 245 196 165 144 129 117 94.5 80.7 64.4 55 44.1 35.5 30.5 24.7 21.2 17 14.4 12.6 11.3 9.37 7.06 5.69 4.78 4.12 3.63 2% 385 348 323 303 285 225 190 166 149 136 110 94.5 76.1 65.3 52.7 42.7 36.8 29.9 25.8 20.8 17.7 15.6 14 11.7 8.86 7.17 6.02 5.19 4.55 1% 424 390 360 336 315 247 208 182 164 150 122 105 85.1 73.3 59.4 48.3 41.8 34 29.4 23.8 20.4 18 16.2 13.6 10.4 8.41 7.06 6.08 5.32
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23098 - SBSMP/3
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Appendix H
XPSTORM PRE DEVELOPMENT RESULTS
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
Page 46
INNOVYZE ENSEMBLE STATISTICS UTILITY (c) Innovyze 2020 Summary information: 6 Total No. of Ensembles: 70 7 No. of Storms per ensemble: 10 8 No. of AEP Bands: 7 9 Object Name: PRE DEV 0 Result type: Max Flow 2 13. Results: AEP: 1% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_lpcet_10min 0.1185 0.1298 0.1190 0.1360 0.1333 0.1350 0.1313 0.1241 0.1419 0.1261 0.1295 0.0072 0.1306 ECN_lpet_15min 0.1348 0.1321 0.1117 0.1088 0.1389 0.1312 0.1150 0.1634 0.1349 0.1129 0.1284 0.0159 0.1316 ECN_lpet_1_Shr 0.0784 0.0907 0.0973 0.0849 0.0970 0.0953 0.0918 0.1159 0.0863 0.0954 0.0933 0.0095 0.0935 ECN_lp¢et_lhr 0.1408 0.1162 0.0919 0.1013 0.0744 0.1143 0.0801 0.0970 0.0977 0.0946 0.1008 0.0181 0.0974 ECN_lpet_20min 0.1151 0.1564 0.1151 0.1043 0.1115 0.1229 0.1108 0.1142 0.1174 0.1305 0.1198 0.0139 0.1151 ECN_lpet_25min 0.1070 0.1586 0.1205 0.1194 0.1263 0.1105 0.1031 0.1261 0.1137 0.1351 0.1220 0.0153 0.1199 ECN_lpcet_2hr 0.1013 0.0832 0.0774 0.0915 0.0919 0.0850 0.0655 0.0693 0.0786 0.0977 0.0841 0.0111 0.0841 ECN_lpet_30min 0.1154 0.1222 0.1506 0.0962 0.1127 0.1413 0.1092 0.1128 0.1205 0.1096 0.1191 0.0152 0.1141 ECN_lpcet_3hr 0.0813 0.0795 0.0936 0.0702 0.0523 0.0785 0.0539 0.0956 0.0470 0.1029 0.0755 0.0184 0.0790 ECN_lpet_45min 0.1506 0.1395 0.0950 0.1252 0.1098 0.0919 0.0983 0.1364 0.0791 0.1153 0.1141 0.0222 0.1126 CRITICAL DURATION : The critical duration for the 1% AEP is the ensemble ECN_lpct_15min. The median pattern for this ensemble is storm 2 (storm name : ECN_Ipct_15min_2). The pattern with the greatest <Max Flow> for this ensemble is storm 8 (storm name : ECN_lpct_15min_8). AEP: 10% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_10pet_10min 0.0723 0.0737 0.0687 0.0742 0.0806 0.0759 0.0784 0.0795 0.0739 0.0774 0.0755 0.0034 0.0751 ECN_10pet_15min 0.0713 0.0746 0.0798 0.0862 0.0845 0.0798 0.0748 0.0821 0.0999 0.0979 0.0831 0.0090 0.0810 ECN_10pet_1_Shr 0.0791 0.0509 0.0738 0.0736 0.0589 0.0645 0.0536 0.0522 0.0466 0.0630 0.0616 0.0105 0.0609 ECN_10pet_1hr 0.0856 0.0644 0.0629 0.0572 0.0691 0.0686 0.0695 0.0690 0.0596 0.0931 0.0699 0.0106 0.0688 ECN_10pet_20min 0.0649 0.0718 0.0798 0.0905 0.0879 0.0818 0.0760 0.1052 0.1067 0.0690 0.0834 0.0136 0.0808 ECN_10pet_25min 0.0724 0.1054 0.0608 0.0631 0.0596 0.1039 0.0746 0.0760 0.0808 0.0959 0.0793 0.0162 0.0753 ECN_10pet_2hr 0.0666 0.0442 0.0582 0.0843 0.0589 0.0557 0.0621 0.0460 0.0638 0.0609 0.0601 0.0106 0.0599 ECN_10pet_30min 0.0551 0.0876 0.0952 0.0690 0.0624 0.0813 0.0961 0.0812 0.0842 0.0873 0.0800 0.0129 0.0828 ECN_10pet_3hr 0.0722 0.0464 0.0451 0.0621 0.0540 0.0347 0.0507 0.0390 0.0457 0.0455 0.0495 0.0104 0.0461 ECN_10pet_45min 0.0765 0.0771 0.0860 0.0663 0.0685 0.0679 0.0656 0.0528 0.0937 0.0863 0.0741 0.0116 0.0725 CRITICAL DURATION : The critical duration for the 10% AEP is the ensemble ECN_10pct_30min. The median pattern for this ensemble is storm 9 (storm name : ECN_10pct_30min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 7 (Storm name : ECN_10pct_30min_7). AEP: 2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_2pet_10min 0.1060 0.1160 0.1064 0.1214 0.1191 0.1206 0.1173 0.1110 0.1264 0.1033 0.1147 0.0073 0.1166 ECN_2pet_15min 0.1202 0.1163 0.1001 0.0984 0.1258 0.1176 0.1044 0.1447 0.1222 0.1026 0.1152 0.0136 0.1169 ECN_2pet_1_Shr 0.0691 0.0799 0.0862 0.0710 0.0860 0.0845 0.0813 0.1019 0.0765 0.0845 0.0821 0.0088 0.0829 ECN_2pcet_lhr 0.1255 0.1040 0.0813 0.0908 0.0665 0.1025 0.0719 0.0864 0.0875 0.0842 0.0901 0.0162 0.0869 ECN_2pet_20min 0.1042 0.1414 0.1029 0.0933 0.1012 0.1099 0.1005 0.1032 0.1061 0.1186 0.1081 0.0127 0.1037 ECN_2pet_25min 0.0967 0.1423 0.1089 0.1082 0.1127 0.1002 0.0934 0.1141 0.1021 0.1223 0.1101 0.0136 0.1085 ECN_2pcet_2hr 0.0889 0.0736 0.0684 0.0807 0.0815 0.0753 0.0580 0.0614 0.0695 0.0858 0.0743 0.0096 0.0744 ECN_2pet_30min 0.1036 0.1069 0.1359 0.0870 0.1017 0.1254 0.0989 0.1021 0.1089 0.0989 0.1069 0.0133 0.1028 ECN_2pet_3hr 0.0719 0.0703 0.0829 0.0612 0.0463 0.0695 0.0473 0.0846 0.0416 0.0911 0.0667 0.0164 0.0699 ECN_2pet_45min 0.1347 0.1244 0.0851 0.1125 0.0988 0.0816 0.0885 0.1217 0.0710 0.1030 0.1021 0.0198 0.1009 CRITICAL DURATION : The critical duration for the 2% AEP is the ensemble ECN_2pct_15min. The median pattern for this ensemble is storm 6 (storm name : ECN_2pct_15min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 8 (storm name : ECN_2pct_15min_8). AEP: 20% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median
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ECN_20pet_10min 0.0590 0.0567 0.0567 0.0622 0.0554 0.0576 0.0570 0.0619 0.0536 0.0596 0.0580 0.0026 0.0573 ECN_20pet_15min 0.0577 0.0580 0.0623 0.0655 0.0652 0.0670 0.0692 0.0725 0.0782 0.0820 0.0678 0.0076 0.0662 ECN_20pet_1_Shr 0.0510 0.0683 0.0664 0.0404 0.0695 0.0350 0.0448 0.0557 0.0708 0.0572 0.0559 0.0122 0.0564 ECN_20pet_lhr 0.0811 0.0492 0.0573 0.0662 0.0679 0.0646 0.0452 0.0461 0.0700 0.0572 0.0605 0.0110 0.0610 ECN_20pet_20min 0.0569 0.0625 0.0556 0.0672 0.0646 0.0608 0.0741 0.0625 0.0774 0.0882 0.0670 0.0096 0.0636 ECN_20pet_25min 0.0643 0.0625 0.0515 0.0537 0.0624 0.0667 0.0745 0.0659 0.0889 0.0794 0.0670 0.0107 0.0651 ECN_20pet_2hr 0.0502 0.0487 0.0498 0.0457 0.0574 0.0421 0.0760 0.0694 0.0413 0.0455 0.0526 0.0110 0.0492 ECN_20pcet_30min 0.0901 0.0563 0.0518 0.0540 0.0623 0.0694 0.0734 0.0818 0.0692 0.0735 0.0682 0.0117 0.0693 ECN_20pet_3hr 0.0490 0.0560 0.0681 0.0439 0.0365 0.0318 0.0366 0.0290 0.0362 0.0424 0.0429 0.0113 0.0395 ECN_20pet_45min 0.0617 0.0615 0.0515 0.0663 0.0654 0.0529 0.0485 0.0528 0.0728 0.0705 0.0604 0.0081 0.0616 CRITICAL DURATION : The critical duration for the 20% AEP is the ensemble ECN_20pct_30min. The median pattern for this ensemble is storm 6 (storm name : ECN_20pct_30min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 1 (storm name : ECN_20pct_30min_1). REP: 5% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_5pet_10min 0.0954 0.0967 0.0916 0.0866 0.0944 0.0890 0.1010 0.0932 0.0970 0.0988 0.0944 0.0042 0.0949 ECN_5pet_15min 0.0820 0.0867 0.0910 0.1018 0.1000 0.0913 0.0862 0.0962 0.1197 0.1168 0.0972 0.0121 0.0938 ECN_5pet_1_5hr 0.0929 0.0623 0.0863 0.0867 0.0716 0.0751 0.0631 0.0678 0.0544 0.0738 0.0734 0.0116 0.0727 ECN_5pcet_lhr 0.0995 0.0765 0.0733 0.0669 0.0805 0.0801 0.0808 0.0799 0.0697 0.1081 0.0815 0.0122 0.0800 ECN_5pet_20min 0.0859 0.0824 0.0923 0.1040 0.1053 0.0939 0.0868 0.1220 0.1240 0.0786 0.0975 0.0151 0.0931 ECN_5pet_25min 0.0827 0.1212 0.0721 0.0740 0.0803 0.1207 0.0852 0.0873 0.0932 0.1097 0.0926 0.0173 0.0863 ECN_5pcet_2hr 0.0783 0.0519 0.0683 0.0987 0.0695 0.0715 0.0729 0.0540 0.0744 0.0728 0.0712 0.0123 0.0722 ECN_5pet_30min 0.0679 0.1016 0.1107 0.0795 0.0725 0.0935 0.1108 0.0938 0.0970 0.1002 0.0927 0.0142 0.0954 ECN_5pcet_3hr 0.0850 0.0546 0.0590 0.0728 0.0634 0.0408 0.0596 0.0458 0.0537 0.0534 0.0588 0.0121 0.0568 ECN_5pet_45min 0.0888 0.0906 0.1010 0.0764 0.0792 0.0853 0.0761 0.0620 0.1081 0.0999 0.0867 0.0132 0.0871 CRITICAL DURATION : The critical duration for the 5% AEP is the ensemble ECN_Spct_30min. The median pattern for this ensemble is storm 9 (storm name : ECN_Spct_30min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 7 (storm name : ECN_Spct_30min_7). AEP: 50% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_50pet_10min 0.0298 0.0333 0.0333 0.0368 0.0335 0.0352 0.0336 0.0328 0.0309 0.0304 0.0329 0.0020 0.0333 ECN_50pet_15min 0.0387 0.0380 0.0415 0.0400 0.0393 0.0430 0.0446 0.0444 0.0458 0.0497 0.0425 0.0035 0.0422 ECN_50pet_1_Shr 0.0347 0.0483 0.0449 0.0288 0.0490 0.0249 0.0315 0.0396 0.0498 0.0410 0.0393 0.0085 0.0403 ECN_50pet_1hr 0.0533 0.0338 0.0392 0.0399 0.0483 0.0467 0.0316 0.0326 0.0498 0.0411 0.0416 0.0072 0.0405 ECN_50pet_20min 0.0412 0.0417 0.0379 0.0460 0.0408 0.0434 0.0433 0.0422 0.0520 0.0584 0.0447 0.0058 0.0427 ECN_50pet_25min 0.0407 0.0422 0.0364 0.0375 0.0448 0.0419 0.0475 0.0478 0.0617 0.0563 0.0457 0.0076 0.0435 ECN_50pet_2hr 0.0348 0.0336 0.0321 0.0323 0.0411 0.0292 0.0530 0.0452 0.0288 0.0324 0.0363 0.0074 0.0330 ECN_50pet_30min 0.0641 0.0347 0.0337 0.0389 0.0452 0.0400 0.0520 0.0530 0.0490 0.0508 0.0461 0.0090 0.0471 ECN_50pet_3hr 0.0346 0.0394 0.0482 0.0268 0.0256 0.0221 0.0254 0.0202 0.0254 0.0300 0.0298 0.0082 0.0262 ECN_50pet_45min 0.0373 0.0365 0.0336 0.0456 0.0455 0.0363 0.0342 0.0383 0.0525 0.0505 0.0410 0.0065 0.0378 CRITICAL DURATION : The critical duration for the 50% AEP is the ensemble ECN_50pct_30min. The median pattern for this ensemble is storm 9 (storm name : ECN_SOpct_30min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 1 (storm name : ECN_50pct_30min_1). REP: 63.2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_63pct_10min 0.0258 0.0240 0.0240 0.0318 0.0249 0.0261 0.0243 0.0284 0.0218 0.0262 0.0257 0.0026 0.0253 ECN_63pcet_15min 0.0300 0.0330 0.0321 0.0317 0.0339 0.0331 0.0347 0.0350 0.0395 0.0398 0.0343 0.0030 0.0335 ECN_63pet_1_Shr 0.0281 0.0419 0.0379 0.0251 0.0426 0.0216 0.0273 0.0340 0.0437 0.0360 0.0338 0.0075 0.0350 ECN_63pet_lhr 0.0436 0.0281 0.0322 0.0313 0.0415 0.0403 0.0276 0.0280 0.0433 0.0358 0.0352 0.0062 0.0340 ECN_63pet_20min 0.0350 0.0323 0.0322 0.0399 0.0356 0.0370 0.0343 0.0368 0.0449 0.0487 0.0377 0.0051 0.0362 ECN_63pcet_25min 0.0356 0.0369 0.0319 0.0315 0.0393 0.0365 0.0410 0.0415 0.0525 0.0472 0.0394 0.0062 0.0381 ECN_63pet_2hr 0.0288 0.0284 0.0257 0.0281 0.0360 0.0252 0.0448 0.0328 0.0250 0.0283 0.0303 0.0058 0.0284 ECN_63pcet_30min 0.0554 0.0305 0.0295 0.0338 0.0393 0.0321 0.0443 0.0413 0.0419 0.0418 0.0390 0.0074 0.0403 ECN_63pet_3hr 0.0300 0.0340 0.0420 0.0203 0.0223 0.0191 0.0219 0.0175 0.0220 0.0261 0.0255 0.0073 0.0221 ECN_63pcet_45min 0.0299 0.0297 0.0268 0.0383 0.0387 0.0304 0.0299 0.0337 0.0460 0.0442 0.0347 0.0063 0.0320 CRITICAL DURATION : The critical duration for the 63.2% AEP is the ensemble ECN_63pct_30min. The median pattern for this ensemble is storm 8 (storm name : ECN_63pct_30min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 1 (Storm name : ECN_63pct_30min_1).
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23098 - SBSMP/3
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Appendix I
XPSTORM POST DEVELOPMENT RESULTS
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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Summary information: INNOVYZE ENSEMBLE STATISTICS UTILITY (c) Innovyze 2020 6 Total No. of Ensembles: 70 7 No. of Storms per ensemble: 10 No. of AEP Bands: 7 Object Name: Result type: 13 Results: POST DEV GROUND Max Flow AEP: 1% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_lpcet_10min 0.0561 0.0636 0.0565 0.0677 0.0659 0.0670 0.0646 0.0599 0.0747 0.0589 0.0635 0.0055 0.0641 ECN_lpet_15min 0.0713 0.0660 0.0542 0.0544 0.0697 0.0670 0.0580 0.0845 0.0705 0.0567 0.0652 0.0091 0.0665 ECN_lpet_1_Shr 0.0427 0.0491 0.0504 0.0428 0.0513 0.0494 0.0473 0.0567 0.0456 0.0496 0.0485 0.0040 0.0493 ECN_lp¢et_lhr 0.0743 0.0616 0.0480 0.0534 0.0381 0.0590 0.0420 0.0482 0.0508 0.0496 0.0525 0.0099 0.0502 ECN_lpet_20min 0.0631 0.0826 0.0554 0.0500 0.0572 0.0616 0.0546 0.0578 0.0571 0.0667 0.0606 0.0086 0.0575 ECN_lpet_25min 0.0587 0.0825 0.0592 0.0619 0.0654 0.0563 0.0549 0.0656 0.0557 0.0703 0.0630 0.0080 0.0605 ECN_lpcet_2hr 0.0515 0.0435 0.0420 0.0479 0.0474 0.0452 0.0343 0.0359 0.0408 0.0537 0.0442 0.0059 0.0444 ECN_lpet_30min 0.0609 0.0634 0.0788 0.0514 0.0557 0.0744 0.0567 0.0597 0.0644 0.0576 0.0623 0.0081 0.0603 ECN_lpcet_3hr 0.0421 0.0411 0.0484 0.0356 0.0274 0.0406 0.0275 0.0495 0.0246 0.0534 0.0390 0.0095 0.0409 ECN_lpet_45min 0.0794 0.0738 0.0515 0.0630 0.0563 0.0480 0.0518 0.0668 0.0405 0.0587 0.0590 0.0114 0.0575 CRITICAL DURATION : The critical duration for the 1% AEP is the ensemble ECN_lpct_15min. The median pattern for this ensemble is storm 6 (storm name : ECN_Ipct_15min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 8 (storm name : ECN_lpct_15min_8). AEP: 10% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_10pet_10min 0.0375 0.0384 0.0354 0.0384 0.0430 0.0399 0.0445 0.0423 0.0386 0.0462 0.0404 0.0033 0.0393 ECN_10pet_15min 0.0376 0.0368 0.0423 0.0411 0.0421 0.0401 0.0384 0.0391 0.0520 0.0501 0.0420 0.0049 0.0406 ECN_10pet_1_Shr 0.0412 0.0262 0.0387 0.0347 0.0294 0.0330 0.0275 0.0265 0.0251 0.0345 0.0317 0.0053 0.0312 ECN_10pet_1hr 0.0470 0.0352 0.0312 0.0382 0.0347 0.0344 0.0354 0.0359 0.0300 0.0515 0.0373 0.0064 0.0353 ECN_10pet_20min 0.0368 0.0347 0.0392 0.0461 0.0437 0.0412 0.0399 0.0528 0.0545 0.0373 0.0426 0.0064 0.0406 ECN_10pet_25min 0.0380 0.0549 0.0339 0.0333 0.0343 0.0524 0.0378 0.0375 0.0415 0.0477 0.0411 0.0074 0.0379 ECN_10pet_2hr 0.0350 0.0238 0.0306 0.0451 0.0329 0.0325 0.0372 0.0246 0.0327 0.0340 0.0328 0.0057 0.0328 ECN_10pet_30min 0.0288 0.0421 0.0574 0.0352 0.0325 0.0417 0.0493 0.0414 0.0419 0.0453 0.0416 0.0078 0.0418 ECN_10pet_3hr 0.0372 0.0240 0.0232 0.0323 0.0281 0.0182 0.0262 0.0203 0.0238 0.0237 0.0257 0.0053 0.0239 ECN_10pet_45min 0.0424 0.0373 0.0415 0.0350 0.0361 0.0351 0.0354 0.0272 0.0483 0.0473 0.0386 0.0061 0.0367 CRITICAL DURATION : The critical duration for the 10% AEP is the ensemble ECN_10pct_30min. The median pattern for this ensemble is storm 9 (storm name : ECN_10pct_30min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 3 (Storm name : ECN_10pct_30min_3). AEP: 2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_2pet_10min 0.0504 0.0571 0.0507 0.0608 0.0592 0.0602 0.0580 0.0537 0.0672 0.0499 0.0567 0.0053 0.0575 ECN_2pet_15min 0.0642 0.0570 0.0493 0.0494 0.0630 0.0592 0.0526 0.0745 0.0638 0.0514 0.0584 0.0077 0.0581 ECN_2pet_1_Shr 0.0377 0.0435 0.0445 0.0359 0.0455 0.0438 0.0418 0.0497 0.0405 0.0440 0.0427 0.0037 0.0437 ECN_2pcet_lhr 0.0665 0.0552 0.0421 0.0477 0.0342 0.0528 0.0377 0.0424 0.0455 0.0442 0.0468 0.0089 0.0449 ECN_2pet_20min 0.0571 0.0748 0.0498 0.0451 0.0518 0.0544 0.0493 0.0521 0.0516 0.0605 0.0547 0.0078 0.0520 ECN_2pet_25min 0.0529 0.0737 0.0532 0.0560 0.0587 0.0511 0.0498 0.0591 0.0501 0.0636 0.0568 0.0071 0.0546 ECN_2pcet_2hr 0.0454 0.0383 0.0373 0.0424 0.0420 0.0401 0.0304 0.0318 0.0361 0.0475 0.0391 0.0052 0.0392 ECN_2pet_30min 0.0549 0.0551 0.0712 0.0465 0.0501 0.0667 0.0514 0.0541 0.0583 0.0518 0.0560 0.0072 0.0545 ECN_2pet_3hr 0.0372 0.0363 0.0428 0.0309 0.0242 0.0359 0.0240 0.0437 0.0217 0.0472 0.0344 0.0085 0.0361 ECN_2pet_45min 0.0712 0.0656 0.0463 0.0565 0.0506 0.0422 0.0464 0.0595 0.0365 0.0520 0.0527 0.0102 0.0513 CRITICAL DURATION : The critical duration for the 2% AEP is the ensemble ECN_2pct_15min. The median pattern for this ensemble is storm 6 (storm name : ECN_2pct_15min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 8 (storm name : ECN_2pct_15min_8). AEP: 20% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median
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ECN_20pet_10min 0.0310 0.0302 0.0302 0.0380 0.0317 0.0331 0.0300 0.0358 0.0322 0.0314 0.0323 0.0025 0.0315 ECN_20pet_15min 0.0300 0.0341 0.0312 0.0326 0.0309 0.0323 0.0340 0.0363 0.0405 0.0437 0.0346 0.0042 0.0333 ECN_20pet_1_Shr 0.0271 0.0363 0.0337 0.0216 0.0350 0.0188 0.0227 0.0295 0.0373 0.0297 0.0292 0.0062 0.0296 ECN_20pet_lhr 0.0419 0.0252 0.0291 0.0334 0.0371 0.0353 0.0259 0.0247 0.0356 0.0300 0.0318 0.0055 0.0317 ECN_20pet_20min 0.0302 0.0312 0.0266 0.0335 0.0312 0.0311 0.0384 0.0303 0.0369 0.0465 0.0336 0.0054 0.0312 ECN_20pet_25min 0.0311 0.0303 0.0293 0.0283 0.0371 0.0328 0.0371 0.0347 0.0454 0.0391 0.0345 0.0050 0.0337 ECN_20pet_2hr 0.0255 0.0279 0.0241 0.0239 0.0300 0.0220 0.0399 0.0426 0.0220 0.0237 0.0282 0.0070 0.0248 ECN_20pcet_30min 0.0466 0.0267 0.0264 0.0315 0.0318 0.0358 0.0410 0.0400 0.0359 0.0386 0.0354 0.0061 0.0359 ECN_20pet_3hr 0.0255 0.0292 0.0354 0.0220 0.0191 0.0165 0.0188 0.0151 0.0188 0.0222 0.0223 0.0059 0.0205 ECN_20pet_45min 0.0318 0.0314 0.0262 0.0336 0.0345 0.0277 0.0247 0.0284 0.0366 0.0370 0.0312 0.0041 0.0316 CRITICAL DURATION : The critical duration for the 20% AEP is the ensemble ECN_20pct_30min. The median pattern for this ensemble is storm 9 (storm name : ECN_20pct_30min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 1 (storm name : ECN_20pct_30min_1). REP: 5% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_5pet_10min 0.0469 0.0478 0.0443 0.0438 0.0497 0.0462 0.0540 0.0489 0.0480 0.0555 0.0485 0.0036 0.0479 ECN_5pet_15min 0.0426 0.0418 0.0483 0.0490 0.0503 0.0460 0.0442 0.0465 0.0618 0.0595 0.0490 0.0064 0.0474 ECN_5pet_1_5hr 0.0481 0.0307 0.0452 0.0410 0.0344 0.0384 0.0322 0.0332 0.0291 0.0402 0.0373 0.0060 0.0364 ECN_5pcet_lhr 0.0543 0.0419 0.0363 0.0440 0.0409 0.0401 0.0413 0.0416 0.0351 0.0595 0.0435 0.0073 0.0415 ECN_5pet_20min 0.0453 0.0400 0.0454 0.0534 0.0523 0.0477 0.0457 0.0617 0.0638 0.0426 0.0498 0.0075 0.0467 ECN_5pet_25min 0.0435 0.0633 0.0387 0.0385 0.0391 0.0612 0.0434 0.0431 0.0479 0.0549 0.0474 0.0088 0.0434 ECN_5pcet_2hr 0.0411 0.0278 0.0359 0.0526 0.0384 0.0397 0.0435 0.0287 0.0382 0.0401 0.0386 0.0067 0.0391 ECN_5pet_30min 0.0356 0.0489 0.0659 0.0402 0.0372 0.0481 0.0570 0.0479 0.0485 0.0519 0.0481 0.0087 0.0483 ECN_5pcet_3hr 0.0437 0.0283 0.0293 0.0379 0.0330 0.0214 0.0309 0.0239 0.0280 0.0278 0.0304 0.0062 0.0288 ECN_5pet_45min 0.0492 0.0436 0.0492 0.0403 0.0416 0.0423 0.0408 0.0313 0.0558 0.0545 0.0449 0.0070 0.0430 CRITICAL DURATION : The critical duration for the 5% AEP is the ensemble ECN_Spct_30min. The median pattern for this ensemble is storm 9 (storm name : ECN_Spct_30min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 3 (storm name : ECN_Spct_30min_3). AEP: 50% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_50pet_10min 0.0211 0.0222 0.0222 0.0258 0.0215 0.0225 0.0220 0.0230 0.0237 0.0208 0.0225 0.0014 0.0222 ECN_50pet_15min 0.0221 0.0251 0.0223 0.0205 0.0193 0.0215 0.0228 0.0235 0.0264 0.0292 0.0233 0.0028 0.0225 ECN_50pet_1_Shr 0.0180 0.0257 0.0225 0.0154 0.0248 0.0132 0.0159 0.0207 0.0264 0.0213 0.0204 0.0044 0.0210 ECN_50pet_1hr 0.0280 0.0167 0.0194 0.0214 0.0263 0.0252 0.0182 0.0173 0.0255 0.0215 0.0219 0.0039 0.0214 ECN_50pet_20min 0.0219 0.0215 0.0192 0.0223 0.0195 0.0217 0.0250 0.0204 0.0248 0.0316 0.0228 0.0035 0.0218 ECN_50pet_25min 0.0194 0.0204 0.0200 0.0193 0.0268 0.0203 0.0240 0.0248 0.0312 0.0271 0.0233 0.0039 0.0222 ECN_50pet_2hr 0.0172 0.0192 0.0155 0.0169 0.0215 0.0155 0.0274 0.0296 0.0157 0.0169 0.0196 0.0048 0.0171 ECN_50pet_30min 0.0327 0.0181 0.0175 0.0227 0.0226 0.0230 0.0289 0.0267 0.0249 0.0264 0.0244 0.0044 0.0240 ECN_50pet_3hr 0.0180 0.0202 0.0251 0.0135 0.0134 0.0115 0.0131 0.0106 0.0132 0.0158 0.0154 0.0042 0.0134 ECN_50pet_45min 0.0217 0.0199 0.0170 0.0218 0.0240 0.0185 0.0177 0.0207 0.0264 0.0266 0.0214 0.0032 0.0212 CRITICAL DURATION : The critical duration for the 50% AEP is the ensemble ECN_50pct_30min. The median pattern for this ensemble is storm 9 (storm name : ECN_SOpct_30min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 1 (storm name : ECN_50pct_30min_1). REP: 63.2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_63pct_10min 0.0185 0.0195 0.0195 0.0226 0.0177 0.0186 0.0194 0.0202 0.0208 0.0183 0.0195 0.0014 0.0195 ECN_63pcet_15min 0.0195 0.0222 0.0197 0.0181 0.0168 0.0175 0.0188 0.0195 0.0231 0.0247 0.0200 0.0024 0.0195 ECN_63pet_1_Shr 0.0148 0.0222 0.0188 0.0134 0.0216 0.0113 0.0139 0.0176 0.0230 0.0187 0.0175 0.0039 0.0181 ECN_63pet_lhr 0.0235 0.0139 0.0160 0.0178 0.0225 0.0215 0.0156 0.0152 0.0223 0.0186 0.0187 0.0033 0.0182 ECN_63pet_20min 0.0193 0.0190 0.0169 0.0194 0.0169 0.0184 0.0208 0.0178 0.0215 0.0270 0.0197 0.0028 0.0191 ECN_63pcet_25min 0.0169 0.0178 0.0166 0.0161 0.0236 0.0177 0.0209 0.0214 0.0267 0.0226 0.0200 0.0034 0.0193 ECN_63pet_2hr 0.0141 0.0162 0.0135 0.0147 0.0188 0.0135 0.0230 0.0242 0.0137 0.0148 0.0167 0.0038 0.0148 ECN_63pcet_30min 0.0282 0.0159 0.0154 0.0197 0.0194 0.0192 0.0246 0.0219 0.0213 0.0220 0.0208 0.0036 0.0205 ECN_63pet_3hr 0.0157 0.0172 0.0219 0.0105 0.0117 0.0099 0.0113 0.0092 0.0115 0.0137 0.0133 0.0037 0.0116 ECN_63pcet_45min 0.0184 0.0165 0.0139 0.0182 0.0204 0.0155 0.0153 0.0182 0.0231 0.0233 0.0183 0.0030 0.0182 CRITICAL DURATION : The critical duration for the 63.2% AEP is the ensemble ECN_63pct_30min. The median pattern for this ensemble is storm 9 (storm name : ECN_63pct_30min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 1 (Storm name : ECN_63pct_30min_1).
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INNOVYZE ENSEMBLE STATISTICS UTILITY (c) Innovyze 2020 Summary information: 6 Total No. of Ensembles: 70 7 No. of Storms per ensemble: 10 8 No. of AEP Bands: 7 9 Object Name: ROOF 1 0 Result type: Max Flow 2 13. Results: AEP: 1% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_lpcet_10min 0.0404 0.0351 0.0401 0.0332 0.0334 0.0329 0.0343 0.0377 0.0401 0.0418 0.0369 0.0033 0.0364 ECN_lpet_15min 0.0385 0.0363 0.0413 0.0389 0.0284 0.0290 0.0352 0.0401 0.0317 0.0359 0.0355 0.0043 0.0361 ECN_lpet_1_Shr 0.0200 0.0231 0.0196 0.0200 0.0230 0.0190 0.0186 0.0265 0.0185 0.0197 0.0208 0.0025 0.0198 ECN_lp¢et_lhr 0.0338 0.0265 0.0211 0.0244 0.0182 0.0230 0.0228 0.0235 0.0201 0.0229 0.0236 0.0040 0.0230 ECN_lpet_20min 0.0367 0.0380 0.0364 0.0350 0.0318 0.0297 0.0279 0.0270 0.0298 0.0272 0.0319 0.0040 0.0308 ECN_lpet_25min 0.0344 0.0378 0.0342 0.0250 0.0336 0.0249 0.0284 0.0261 0.0251 0.0281 0.0298 0.0045 0.0282 ECN_lpcet_2hr 0.0226 0.0183 0.0190 0.0211 0.0189 0.0191 0.0140 0.0146 0.0176 0.0275 0.0193 0.0037 0.0189 ECN_lpet_30min 0.0359 0.0327 0.0336 0.0234 0.0256 0.0399 0.0220 0.0242 0.0276 0.0239 0.0289 0.0059 0.0266 ECN_lpcet_3hr 0.0172 0.0171 0.0202 0.0154 0.0106 0.0168 0.0115 0.0205 0.0133 0.0218 0.0164 0.0036 0.0170 ECN_lpet_45min 0.0359 0.0342 0.0238 0.0297 0.0263 0.0211 0.0237 0.0305 0.0193 0.0232 0.0268 0.0053 0.0251 CRITICAL DURATION : The critical duration for the 1% AEP is the ensemble ECN_lpct_10min. The median pattern for this ensemble is storm 8 (storm name : ECN_1pct_10min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_lpct_10min_10). AEP: 10% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev Median ECN_10pet_10min 0.0258 0.0251 0.0274 0.0297 0.0233 0.0241 0.0258 0.0231 0.0250 0.0285 0.0258 0.0021 0.0255 ECN_10pet_15min 0.0291 0.0285 0.0287 0.0230 0.0212 0.0246 0.0231 0.0216 0.0271 0.0250 0.0252 0.0028 0.0248 ECN_10pet_1_Shr 0.0183 0.0134 0.0169 0.0212 0.0156 0.0146 0.0136 0.0183 0.0109 0.0165 0.0159 0.0028 0.0161 ECN_10pet_1hr 0.0223 0.0187 0.0203 0.0295 0.0145 0.0181 0.0147 0.0144 0.0142 0.0247 0.0191 0.0049 0.0184 ECN_10pet_20min 0.0215 0.0239 0.0177 0.0190 0.0201 0.0202 0.0185 0.0229 0.0250 0.0234 0.0212 0.0024 0.0209 ECN_10pet_25min 0.0176 0.0242 0.0263 0.0224 0.0266 0.0231 0.0224 0.0185 0.0238 0.0241 0.0229 0.0028 0.0235 ECN_10pet_2hr 0.0154 0.0104 0.0135 0.0197 0.0164 0.0199 0.0210 0.0120 0.0138 0.0189 0.0161 0.0035 0.0159 ECN_10pet_30min 0.0209 0.0225 0.0343 0.0184 0.0170 0.0177 0.0211 0.0187 0.0204 0.0181 0.0209 0.0048 0.0195 ECN_10pet_3hr 0.0156 0.0096 0.0138 0.0128 0.0111 0.0071 0.0108 0.0080 0.0094 0.0094 0.0108 0.0025 0.0102 ECN_10pet_45min 0.0268 0.0223 0.0218 0.0141 0.0153 0.0170 0.0161 0.0141 0.0196 0.0224 0.0189 0.0041 0.0183 CRITICAL DURATION : The critical duration for the 10% AEP is the ensemble ECN_10pct_10min. The median pattern for this ensemble is storm 1 (storm name : ECN_10pct_10min_1). The pattern with the greatest <Max Flow> for this ensemble is storm 4 (Storm name : ECN_10pct_10min_4). AEP: 2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_2pet_10min 0.0368 0.0320 0.0366 0.0302 0.0305 0.0299 0.0313 0.0344 0.0366 0.0381 0.0336 0.0030 0.0332 ECN_2pet_15min 0.0352 0.0331 0.0377 0.0355 0.0259 0.0265 0.0322 0.0366 0.0290 0.0328 0.0324 0.0039 0.0330 ECN_2pet_1_Shr 0.0178 0.0206 0.0175 0.0178 0.0205 0.0169 0.0166 0.0237 0.0164 0.0175 0.0185 0.0022 0.0177 ECN_2pcet_lhr 0.0304 0.0238 0.0190 0.0220 0.0164 0.0207 0.0205 0.0211 0.0181 0.0207 0.0213 0.0036 0.0207 ECN_2pet_20min 0.0336 0.0346 0.0332 0.0319 0.0291 0.0272 0.0255 0.0246 0.0271 0.0248 0.0292 0.0037 0.0281 ECN_2pet_25min 0.0313 0.0344 0.0311 0.0228 0.0306 0.0227 0.0258 0.0238 0.0228 0.0256 0.0271 0.0041 0.0257 ECN_2pcet_2hr 0.0202 0.0163 0.0170 0.0189 0.0168 0.0171 0.0125 0.0130 0.0157 0.0245 0.0172 0.0033 0.0169 ECN_2pet_30min 0.0326 0.0297 0.0305 0.0213 0.0232 0.0363 0.0199 0.0220 0.0251 0.0217 0.0262 0.0054 0.0241 ECN_2pet_3hr 0.0153 0.0152 0.0180 0.0137 0.0094 0.0150 0.0102 0.0183 0.0118 0.0194 0.0146 0.0032 0.0151 ECN_2pet_45min 0.0325 0.0309 0.0215 0.0268 0.0238 0.0190 0.0214 0.0276 0.0175 0.0210 0.0242 0.0048 0.0226 CRITICAL DURATION : The critical duration for the 2% AEP is the ensemble ECN_2pct_10min. The median pattern for this ensemble is storm 8 (storm name : ECN_2pct_10min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_2pct_10min_10). AEP: 20% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median
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ECN_20pet_10min 0.0225 0.0236 0.0236 0.0237 0.0205 0.0196 0.0234 0.0209 0.0251 0.0222 0.0225 0.0016 0.0230 ECN_20pet_15min 0.0235 0.0265 0.0237 0.0219 0.0183 0.0173 0.0164 0.0177 0.0209 0.0239 0.0210 0.0033 0.0214 ECN_20pet_1_Shr 0.0120 0.0163 0.0163 0.0092 0.0167 0.0135 0.0103 0.0124 0.0170 0.0128 0.0137 0.0027 0.0132 ECN_20pet_lhr 0.0199 0.0114 0.0149 0.0158 0.0178 0.0158 0.0136 0.0119 0.0160 0.0127 0.0150 0.0025 0.0153 ECN_20pet_20min 0.0233 0.0230 0.0207 0.0167 0.0166 0.0210 0.0198 0.0168 0.0209 0.0237 0.0202 0.0026 0.0208 ECN_20pet_25min 0.0166 0.0168 0.0184 0.0177 0.0204 0.0187 0.0157 0.0145 0.0198 0.0202 0.0179 0.0019 0.0180 ECN_20pet_2hr 0.0107 0.0145 0.0122 0.0096 0.0151 0.0129 0.0172 0.0287 0.0113 0.0100 0.0142 0.0053 0.0125 ECN_20pcet_30min 0.0199 0.0161 0.0190 0.0190 0.0140 0.0182 0.0207 0.0201 0.0151 0.0176 0.0180 0.0021 0.0186 ECN_20pet_3hr 0.0101 0.0114 0.0140 0.0097 0.0075 0.0069 0.0082 0.0061 0.0077 0.0093 0.0091 0.0022 0.0087 ECN_20pet_45min 0.0221 0.0156 0.0143 0.0170 0.0212 0.0116 0.0128 0.0121 0.0175 0.0162 0.0160 0.0034 0.0159 CRITICAL DURATION : The critical duration for the 20% AEP is the ensemble ECN_20pct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_20pct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_20pct_10min_9). REP: 5% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_5pet_10min 0.0292 0.0285 0.0311 0.0336 0.0266 0.0273 0.0293 0.0262 0.0283 0.0323 0.0292 0.0023 0.0288 ECN_5pet_15min 0.0328 0.0322 0.0323 0.0260 0.0239 0.0278 0.0261 0.0245 0.0306 0.0283 0.0284 0.0032 0.0280 ECN_5pet_1_5hr 0.0211 0.0155 0.0195 0.0244 0.0180 0.0169 0.0157 0.0211 0.0126 0.0191 0.0184 0.0032 0.0185 ECN_5pcet_lhr 0.0256 0.0215 0.0233 0.0338 0.0167 0.0207 0.0169 0.0166 0.0163 0.0284 0.0220 0.0056 0.0211 ECN_5pet_20min 0.0245 0.0270 0.0201 0.0216 0.0228 0.0230 0.0209 0.0261 0.0284 0.0265 0.0241 0.0027 0.0238 ECN_5pet_25min 0.0200 0.0275 0.0299 0.0255 0.0302 0.0263 0.0254 0.0211 0.0270 0.0274 0.0260 0.0031 0.0266 ECN_5pcet_2hr 0.0179 0.0121 0.0157 0.0228 0.0190 0.0230 0.0243 0.0139 0.0160 0.0219 0.0186 0.0040 0.0184 ECN_5pet_30min 0.0238 0.0255 0.0390 0.0210 0.0194 0.0202 0.0240 0.0213 0.0232 0.0206 0.0238 0.0054 0.0222 ECN_5pcet_3hr 0.0182 0.0112 0.0160 0.0149 0.0130 0.0082 0.0126 0.0094 0.0110 0.0110 0.0126 0.0029 0.0119 ECN_5pet_45min 0.0306 0.0254 0.0249 0.0162 0.0175 0.0195 0.0185 0.0161 0.0225 0.0257 0.0217 0.0046 0.0210 CRITICAL DURATION : The critical duration for the 5% AEP is the ensemble ECN_S5pct_l0min. The median pattern for this ensemble is storm 1 (storm name : ECN_Spct_10min_1). The pattern with the greatest <Max Flow> for this ensemble is storm 4 (storm name : ECN_Spct_10min_4). AEP: 50% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_50pet_10min 0.0168 0.0177 0.0177 0.0178 0.0154 0.0147 0.0176 0.0156 0.0188 0.0166 0.0169 0.0012 0.0172 ECN_50pet_15min 0.0176 0.0198 0.0177 0.0164 0.0137 0.0128 0.0123 0.0132 0.0155 0.0178 0.0157 0.0024 0.0160 ECN_50pet_1_Shr 0.0088 0.0119 0.0119 0.0067 0.0122 0.0099 0.0075 0.0091 0.0125 0.0094 0.0100 0.0020 0.0096 ECN_50pet_1hr 0.0147 0.0084 0.0109 0.0117 0.0131 0.0116 0.0100 0.0088 0.0118 0.0094 0.0110 0.0019 0.0113 ECN_50pet_20min 0.0174 0.0172 0.0155 0.0125 0.0124 0.0157 0.0147 0.0126 0.0156 0.0177 0.0151 0.0019 0.0155 ECN_50pet_25min 0.0124 0.0126 0.0137 0.0132 0.0152 0.0140 0.0117 0.0108 0.0147 0.0150 0.0133 0.0014 0.0135 ECN_50pet_2hr 0.0077 0.0105 0.0088 0.0069 0.0110 0.0094 0.0124 0.0209 0.0082 0.0072 0.0103 0.0039 0.0091 ECN_50pet_30min 0.0148 0.0120 0.0142 0.0142 0.0103 0.0135 0.0154 0.0149 0.0112 0.0131 0.0134 0.0016 0.0138 ECN_50pet_3hr 0.0073 0.0082 0.0100 0.0069 0.0054 0.0049 0.0059 0.0044 0.0055 0.0067 0.0065 0.0016 0.0063 ECN_50pet_45min 0.0164 0.0115 0.0106 0.0126 0.0157 0.0086 0.0095 0.0089 0.0130 0.0120 0.0119 0.0025 0.0117 CRITICAL DURATION : The critical duration for the 50% AEP is the ensemble ECN_50pct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_5Qpct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_50pct_10min_9). REP: 63.2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_63pct_10min 0.0149 0.0157 0.0157 0.0158 0.0136 0.0130 0.0156 0.0139 0.0167 0.0148 0.0150 0.0011 0.0153 ECN_63pcet_15min 0.0156 0.0177 0.0158 0.0146 0.0122 0.0114 0.0109 0.0118 0.0138 0.0158 0.0140 0.0022 0.0142 ECN_63pet_1_Shr 0.0077 0.0105 0.0106 0.0059 0.0108 0.0088 0.0066 0.0080 0.0110 0.0083 0.0088 0.0017 0.0085 ECN_63pet_lhr 0.0130 0.0075 0.0097 0.0103 0.0116 0.0103 0.0089 0.0078 0.0105 0.0083 0.0098 0.0016 0.0100 ECN_63pet_20min 0.0155 0.0153 0.0137 0.0111 0.0110 0.0139 0.0130 0.0111 0.0138 0.0157 0.0134 0.0017 0.0138 ECN_63pcet_25min 0.0110 0.0112 0.0122 0.0117 0.0135 0.0124 0.0104 0.0096 0.0131 0.0134 0.0118 0.0012 0.0120 ECN_63pet_2hr 0.0068 0.0093 0.0078 0.0061 0.0097 0.0083 0.0109 0.0185 0.0073 0.0064 0.0091 0.0034 0.0080 ECN_63pcet_30min 0.0131 0.0106 0.0126 0.0126 0.0092 0.0120 0.0136 0.0132 0.0099 0.0116 0.0119 0.0014 0.0123 ECN_63pet_3hr 0.0064 0.0071 0.0088 0.0061 0.0047 0.0043 0.0052 0.0038 0.0048 0.0058 0.0057 0.0014 0.0055 ECN_63pcet_45min 0.0146 0.0102 0.0094 0.0111 0.0140 0.0076 0.0084 0.0079 0.0115 0.0107 0.0105 0.0023 0.0104 CRITICAL DURATION : The critical duration for the 63.2% AEP is the ensemble ECN_63pct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_63pct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (Storm name : ECN_63pct_10min_9).
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INNOVYZE ENSEMBLE STATISTICS UTILITY (c) Innovyze 2020 Summary information: 6 Total No. of Ensembles: 70 7 No. of Storms per ensemble: 10 8 No. of AEP Bands: 7 9 Object Name: ROOF 2 0 Result type: Max Flow 2 13. Results: AEP: 1% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_lpcet_10min 0.0255 0.0221 0.0253 0.0212 0.0211 0.0210 0.0217 0.0238 0.0254 0.0263 0.0233 0.0020 0.0230 ECN_lpet_15min 0.0244 0.0229 0.0260 0.0245 0.0181 0.0183 0.0222 0.0255 0.0200 0.0227 0.0225 0.0027 0.0228 ECN_lpet_1_Shr 0.0127 0.0146 0.0125 0.0127 0.0145 0.0121 0.0118 0.0168 0.0117 0.0125 0.0132 0.0015 0.0126 ECN_lp¢et_lhr 0.0214 0.0168 0.0134 0.0156 0.0116 0.0146 0.0144 0.0149 0.0128 0.0145 0.0150 0.0025 0.0146 ECN_lpet_20min 0.0232 0.0241 0.0229 0.0221 0.0201 0.0188 0.0176 0.0170 0.0191 0.0173 0.0202 0.0025 0.0196 ECN_lpet_25min 0.0217 0.0240 0.0216 0.0159 0.0214 0.0157 0.0179 0.0166 0.0159 0.0178 0.0188 0.0029 0.0179 ECN_lpcet_2hr 0.0144 0.0116 0.0121 0.0134 0.0120 0.0121 0.0089 0.0093 0.0111 0.0174 0.0122 0.0023 0.0120 ECN_lpet_30min 0.0226 0.0208 0.0213 0.0148 0.0164 0.0253 0.0140 0.0154 0.0176 0.0152 0.0183 0.0037 0.0170 ECN_lpcet_3hr 0.0109 0.0108 0.0128 0.0098 0.0067 0.0107 0.0073 0.0130 0.0084 0.0138 0.0104 0.0023 0.0107 ECN_lpet_45min 0.0228 0.0217 0.0151 0.0188 0.0167 0.0134 0.0152 0.0193 0.0122 0.0148 0.0170 0.0033 0.0159 CRITICAL DURATION : The critical duration for the 1% AEP is the ensemble ECN_lpct_10min. The median pattern for this ensemble is storm 8 (storm name : ECN_1pct_10min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_lpct_10min_10). AEP: 10% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev Median ECN_10pet_10min 0.0163 0.0159 0.0173 0.0187 0.0149 0.0152 0.0163 0.0148 0.0158 0.0180 0.0163 0.0013 0.0161 ECN_10pet_15min 0.0183 0.0180 0.0181 0.0145 0.0134 0.0155 0.0146 0.0137 0.0172 0.0159 0.0159 0.0018 0.0157 ECN_10pet_1_Shr 0.0116 0.0085 0.0107 0.0134 0.0099 0.0093 0.0086 0.0116 0.0069 0.0105 0.0101 0.0018 0.0102 ECN_10pet_1hr 0.0141 0.0119 0.0128 0.0186 0.0092 0.0114 0.0094 0.0092 0.0090 0.0157 0.0121 0.0031 0.0117 ECN_10pet_20min 0.0138 0.0151 0.0113 0.0121 0.0128 0.0129 0.0117 0.0146 0.0158 0.0147 0.0135 0.0015 0.0133 ECN_10pet_25min 0.0111 0.0153 0.0166 0.0142 0.0168 0.0147 0.0142 0.0118 0.0150 0.0153 0.0145 0.0017 0.0148 ECN_10pet_2hr 0.0098 0.0066 0.0086 0.0125 0.0104 0.0126 0.0133 0.0076 0.0087 0.0119 0.0102 0.0022 0.0101 ECN_10pet_30min 0.0132 0.0142 0.0216 0.0117 0.0109 0.0113 0.0134 0.0119 0.0129 0.0115 0.0133 0.0030 0.0124 ECN_10pet_3hr 0.0099 0.0061 0.0087 0.0081 0.0070 0.0045 0.0069 0.0051 0.0060 0.0060 0.0068 0.0016 0.0065 ECN_10pet_45min 0.0169 0.0141 0.0138 0.0090 0.0097 0.0109 0.0102 0.0089 0.0125 0.0142 0.0120 0.0026 0.0117 CRITICAL DURATION : The critical duration for the 10% AEP is the ensemble ECN_10pct_10min. The median pattern for this ensemble is storm 1 (storm name : ECN_10pct_10min_1). The pattern with the greatest <Max Flow> for this ensemble is storm 4 (Storm name : ECN_10pct_10min_4). AEP: 2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_2pet_10min 0.0232 0.0202 0.0231 0.0193 0.0192 0.0191 0.0198 0.0217 0.0231 0.0240 0.0213 0.0019 0.0209 ECN_2pet_15min 0.0222 0.0209 0.0238 0.0224 0.0165 0.0167 0.0203 0.0232 0.0183 0.0207 0.0205 0.0025 0.0208 ECN_2pet_1_Shr 0.0113 0.0130 0.0111 0.0113 0.0130 0.0108 0.0105 0.0150 0.0105 0.0111 0.0118 0.0014 0.0112 ECN_2pcet_lhr 0.0193 0.0151 0.0121 0.0140 0.0104 0.0132 0.0130 0.0134 0.0115 0.0131 0.0135 0.0023 0.0131 ECN_2pet_20min 0.0212 0.0220 0.0209 0.0201 0.0183 0.0171 0.0161 0.0155 0.0174 0.0158 0.0184 0.0023 0.0178 ECN_2pet_25min 0.0198 0.0218 0.0197 0.0145 0.0194 0.0143 0.0163 0.0151 0.0144 0.0162 0.0172 0.0026 0.0163 ECN_2pcet_2hr 0.0128 0.0104 0.0108 0.0120 0.0107 0.0108 0.0079 0.0083 0.0099 0.0155 0.0109 0.0021 0.0107 ECN_2pet_30min 0.0206 0.0189 0.0194 0.0135 0.0148 0.0230 0.0127 0.0140 0.0160 0.0138 0.0167 0.0034 0.0154 ECN_2pet_3hr 0.0097 0.0096 0.0114 0.0087 0.0059 0.0095 0.0065 0.0116 0.0075 0.0123 0.0093 0.0020 0.0095 ECN_2pet_45min 0.0206 0.0196 0.0136 0.0170 0.0151 0.0121 0.0137 0.0175 0.0111 0.0133 0.0153 0.0030 0.0144 CRITICAL DURATION : The critical duration for the 2% AEP is the ensemble ECN_2pct_10min. The median pattern for this ensemble is storm 8 (storm name : ECN_2pct_10min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_2pct_10min_10). AEP: 20% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median
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ECN_20pet_10min 0.0142 0.0149 0.0149 0.0150 0.0129 0.0125 0.0148 0.0133 0.0158 0.0140 0.0142 0.0010 0.0145 ECN_20pet_15min 0.0148 0.0167 0.0149 0.0138 0.0116 0.0111 0.0105 0.0112 0.0133 0.0152 0.0133 0.0020 0.0135 ECN_20pet_1_Shr 0.0076 0.0104 0.0103 0.0058 0.0106 0.0085 0.0065 0.0079 0.0108 0.0081 0.0087 0.0017 0.0083 ECN_20pet_lhr 0.0126 0.0073 0.0095 0.0100 0.0113 0.0100 0.0086 0.0075 0.0101 0.0081 0.0095 0.0016 0.0098 ECN_20pet_20min 0.0147 0.0145 0.0130 0.0106 0.0105 0.0132 0.0126 0.0106 0.0133 0.0150 0.0128 0.0016 0.0131 ECN_20pet_25min 0.0105 0.0107 0.0116 0.0113 0.0129 0.0118 0.0100 0.0092 0.0125 0.0128 0.0113 0.0012 0.0115 ECN_20pet_2hr 0.0068 0.0092 0.0078 0.0061 0.0095 0.0082 0.0109 0.0181 0.0072 0.0063 0.0090 0.0034 0.0080 ECN_20pcet_30min 0.0126 0.0103 0.0120 0.0120 0.0089 0.0116 0.0131 0.0127 0.0096 0.0112 0.0114 0.0013 0.0118 ECN_20pet_3hr 0.0064 0.0073 0.0089 0.0061 0.0048 0.0044 0.0052 0.0039 0.0049 0.0059 0.0058 0.0014 0.0055 ECN_20pet_45min 0.0140 0.0099 0.0090 0.0108 0.0133 0.0074 0.0082 0.0077 0.0111 0.0103 0.0102 0.0021 0.0101 CRITICAL DURATION : The critical duration for the 20% AEP is the ensemble ECN_20pct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_20pct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_20pct_10min_9). REP: 5% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median * | ECN_5pet_10min 0.0184 0.0180 0.0196 0.0212 0.0170 0.0172 0.0185 0.0168 0.0179 0.0204 0.0185 0.0014 0.0182 | ECN_5pet_15min 0.0207 0.0203 0.0204 0.0164 0.0151 0.0175 0.0165 0.0156 0.0195 0.0180 0.0180 0.0020 0.0177 | ECN_5pet_1_5hr 0.0133 0.0098 0.0124 0.0154 0.0114 0.0107 0.0100 0.0133 0.0080 0.0121 0.0117 0.0020 0.0118 | ECN_5pcet_lhr 0.0162 0.0136 0.0147 0.0213 0.0106 0.0131 0.0108 0.0105 0.0104 0.0180 0.0139 0.0035 0.0134 | ECN_5pet_20min 0.0157 0.0171 0.0128 0.0137 0.0145 0.0146 0.0132 0.0165 0.0180 0.0167 0.0153 0.0017 0.0152 | ECN_5pet_25min 0.0126 0.0174 0.0188 0.0161 0.0191 0.0167 0.0161 0.0134 0.0170 0.0173 0.0164 0.0020 0.0168 | ECN_5pcet_2hr 0.0114 0.0077 0.0100 0.0145 0.0120 0.0146 0.0153 0.0088 0.0101 0.0138 0.0118 0.0025 0.0117 | ECN_5pet_30min 0.0150 0.0162 0.0246 0.0134 0.0124 0.0129 0.0152 0.0135 0.0147 0.0131 0.0151 0.0034 0.0141 | ECN_5pcet_3hr 0.0116 0.0071 0.0101 0.0095 0.0082 0.0052 0.0080 0.0060 0.0070 0.0070 0.0080 0.0018 0.0076 | ECN_5pet_45min 0.0193 0.0161 0.0158 0.0103 0.0111 0.0125 0.0117 0.0102 0.0143 0.0163 0.0137 0.0029 0.0134 * | CRITICAL DURATION : The critical duration for the 5% AEP is the ensemble ECN_Spct_1l0min. | The median pattern for this ensemble is storm 1 (storm name : ECN_5pct_10min_1). | The pattern with the greatest <Max Flow> for this ensemble is storm 4 (storm name : ECN_5pct_l0min_4). lig * 119 120 121 AEP: 50% - Max Flow (m*3/s) 122 * 123 | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median * | ECN_50pet_10min 0.0106 0.0112 0.0111 0.0112 0.0097 0.0093 0.0111 0.0099 0.0118 0.0105 0.0106 0.0008 0.0109 | ECN_50pet_15min 0.0111 0.0125 0.0112 0.0103 0.0086 0.0082 0.0078 0.0084 0.0099 0.0113 0.0099 0.0015 0.0101 | ECN_50pet_1_Shr 0.0056 0.0076 0.0075 0.0043 0.0078 0.0063 0.0048 0.0058 0.0079 0.0059 0.0063 0.0012 0.0061 | ECN_50pet_1hr 0.0093 0.0054 0.0070 0.0074 0.0083 0.0074 0.0063 0.0056 0.0075 0.0059 0.0070 0.0012 0.0072 | ECN_50pet_20min 0.0110 0.0108 0.0098 0.0079 0.0079 0.0099 0.0094 0.0079 0.0099 0.0112 0.0096 0.0012 0.0098 | ECN_50pet_25min 0.0078 0.0079 0.0087 0.0083 0.0096 0.0088 0.0074 0.0069 0.0093 0.0095 0.0084 0.0009 0.0085 | ECN_50pet_2hr 0.0049 0.0067 0.0056 0.0044 0.0069 0.0059 0.0079 0.0132 0.0052 0.0046 0.0065 0.0025 0.0058 | ECN_50pet_30min 0.0094 0.0076 0.0089 0.0090 0.0066 0.0086 0.0097 0.0095 0.0071 0.0083 0.0085 0.0010 0.0088 | ECN_50pet_3hr 0.0046 0.0052 0.0064 0.0044 0.0034 0.0031 0.0037 0.0028 0.0035 0.0042 0.0041 0.0010 0.0040 | ECN_50pet_45min 0.0104 0.0073 0.0067 0.0080 0.0099 0.0054 0.0060 0.0057 0.0082 0.0076 0.0075 0.0016 0.0075 * | CRITICAL DURATION : The critical duration for the 50% AEP is the ensemble ECN_50pct_l0min. | The median pattern for this ensemble is storm 7 (storm name : ECN_SOpct_10min_7). | The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_50pct_10min_9). * REP: 63.2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev Median ECN_63pct_10min 0.0094 0.0099 0.0099 0.0100 0.0086 0.0082 0.0098 0.0088 0.0105 0.0093 0.0094 0.0007 0.0096 ECN_63pcet_15min 0.0099 0.0111 0.0100 0.0092 0.0077 0.0073 0.0069 0.0074 0.0088 0.0100 0.0088 0.0014 0.0090 ECN_63pet_1_Shr 0.0049 0.0067 0.0067 0.0038 0.0069 0.0055 0.0042 0.0051 0.0070 0.0052 0.0056 0.0011 0.0054 ECN_63pet_lhr 0.0082 0.0047 0.0061 0.0065 0.0074 0.0065 0.0056 0.0049 0.0066 0.0053 0.0062 0.0010 0.0063 ECN_63pet_20min 0.0098 0.0096 0.0087 0.0070 0.0070 0.0088 0.0083 0.0070 0.0088 0.0100 0.0085 0.0011 0.0087 ECN_63pcet_25min 0.0070 0.0071 0.0077 0.0074 0.0086 0.0078 0.0066 0.0061 0.0083 0.0085 0.0075 0.0008 0.0076 ECN_63pet_2hr 0.0043 0.0059 0.0049 0.0039 0.0061 0.0052 0.0070 0.0116 0.0046 0.0040 0.0058 0.0022 0.0051 ECN_63pcet_30min 0.0083 0.0067 0.0080 0.0080 0.0058 0.0076 0.0086 0.0084 0.0063 0.0074 0.0075 0.0009 0.0078 ECN_63pet_3hr 0.0040 0.0045 0.0056 0.0039 0.0030 0.0028 0.0033 0.0024 0.0031 0.0037 0.0036 0.0009 0.0035 ECN_63pcet_45min 0.0092 0.0065 0.0060 0.0071 0.0088 0.0048 0.0054 0.0050 0.0073 0.0068 0.0067 0.0014 0.0066 CRITICAL DURATION : The critical duration for the 63.2% AEP is the ensemble ECN_63pct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_63pct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_63pct_10min_9).
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INNOVYZE ENSEMBLE STATISTICS UTILITY (c) Innovyze 2020 Summary information: 6 Total No. of Ensembles: 70 7 No. of Storms per ensemble: 10 8 No. of AEP Bands: 7 9 Object Name: ROOF 3 0 Result type: Max Flow 2 13. Results: AEP: 1% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_lpcet_10min 0.0348 0.0302 0.0346 0.0287 0.0288 0.0284 0.0296 0.0325 0.0346 0.0360 0.0318 0.0028 0.0313 ECN_lpet_15min 0.0332 0.0312 0.0355 0.0335 0.0245 0.0249 0.0303 0.0346 0.0273 0.0309 0.0306 0.0037 0.0311 ECN_lpet_1_Shr 0.0172 0.0199 0.0169 0.0172 0.0198 0.0164 0.0160 0.0229 0.0159 0.0170 0.0179 0.0021 0.0171 ECN_lp¢et_lhr 0.0291 0.0228 0.0182 0.0211 0.0157 0.0198 0.0196 0.0203 0.0174 0.0198 0.0204 0.0035 0.0198 ECN_lpet_20min 0.0316 0.0328 0.0313 0.0301 0.0274 0.0256 0.0240 0.0232 0.0258 0.0235 0.0275 0.0034 0.0266 ECN_lpet_25min 0.0296 0.0326 0.0295 0.0216 0.0290 0.0215 0.0244 0.0226 0.0216 0.0242 0.0257 0.0039 0.0243 ECN_lpcet_2hr 0.0195 0.0158 0.0164 0.0182 0.0163 0.0165 0.0121 0.0126 0.0152 0.0237 0.0166 0.0032 0.0163 ECN_lpet_30min 0.0309 0.0283 0.0290 0.0202 0.0221 0.0344 0.0190 0.0209 0.0239 0.0206 0.0249 0.0050 0.0230 ECN_lpcet_3hr 0.0148 0.0147 0.0174 0.0133 0.0091 0.0145 0.0099 0.0177 0.0115 0.0188 0.0142 0.0031 0.0146 ECN_lpet_45min 0.0310 0.0295 0.0205 0.0256 0.0227 0.0182 0.0205 0.0263 0.0167 0.0200 0.0231 0.0046 0.0216 CRITICAL DURATION : The critical duration for the 1% AEP is the ensemble ECN_lpct_10min. The median pattern for this ensemble is storm 8 (storm name : ECN_1pct_10min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_lpct_10min_10). AEP: 10% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev Median ECN_10pet_10min 0.0222 0.0217 0.0236 0.0256 0.0202 0.0208 0.0223 0.0200 0.0215 0.0245 0.0222 0.0018 0.0219 ECN_10pet_15min 0.0250 0.0246 0.0247 0.0198 0.0182 0.0212 0.0199 0.0187 0.0234 0.0216 0.0217 0.0024 0.0214 ECN_10pet_1_Shr 0.0157 0.0116 0.0146 0.0182 0.0135 0.0126 0.0118 0.0158 0.0094 0.0143 0.0138 0.0024 0.0139 ECN_10pet_1hr 0.0192 0.0162 0.0175 0.0254 0.0125 0.0156 0.0127 0.0124 0.0123 0.0213 0.0165 0.0042 0.0159 ECN_10pet_20min 0.0186 0.0205 0.0152 0.0164 0.0173 0.0175 0.0159 0.0198 0.0215 0.0201 0.0183 0.0020 0.0180 ECN_10pet_25min 0.0152 0.0208 0.0227 0.0193 0.0229 0.0200 0.0193 0.0160 0.0205 0.0208 0.0197 0.0024 0.0202 ECN_10pet_2hr 0.0133 0.0090 0.0117 0.0170 0.0141 0.0171 0.0181 0.0103 0.0119 0.0163 0.0139 0.0030 0.0137 ECN_10pet_30min 0.0180 0.0194 0.0295 0.0159 0.0147 0.0153 0.0182 0.0161 0.0176 0.0156 0.0180 0.0041 0.0169 ECN_10pet_3hr 0.0135 0.0083 0.0119 0.0110 0.0096 0.0061 0.0093 0.0069 0.0081 0.0081 0.0093 0.0022 0.0088 ECN_10pet_45min 0.0231 0.0192 0.0188 0.0122 0.0132 0.0147 0.0139 0.0122 0.0169 0.0193 0.0163 0.0035 0.0158 CRITICAL DURATION : The critical duration for the 10% AEP is the ensemble ECN_10pct_10min. The median pattern for this ensemble is storm 1 (storm name : ECN_10pct_10min_1). The pattern with the greatest <Max Flow> for this ensemble is storm 4 (Storm name : ECN_10pct_10min_4). AEP: 2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_2pet_10min 0.0317 0.0276 0.0315 0.0261 0.0262 0.0259 0.0270 0.0296 0.0315 0.0328 0.0290 0.0026 0.0286 ECN_2pet_15min 0.0303 0.0285 0.0325 0.0306 0.0224 0.0228 0.0277 0.0316 0.0250 0.0282 0.0280 0.0034 0.0284 ECN_2pet_1_Shr 0.0154 0.0177 0.0151 0.0154 0.0177 0.0146 0.0143 0.0204 0.0142 0.0151 0.0160 0.0019 0.0152 ECN_2pcet_lhr 0.0263 0.0206 0.0164 0.0190 0.0142 0.0179 0.0177 0.0182 0.0157 0.0178 0.0184 0.0031 0.0178 ECN_2pet_20min 0.0289 0.0299 0.0286 0.0275 0.0250 0.0234 0.0219 0.0212 0.0235 0.0214 0.0251 0.0032 0.0242 ECN_2pet_25min 0.0270 0.0297 0.0268 0.0197 0.0264 0.0196 0.0223 0.0205 0.0197 0.0221 0.0234 0.0036 0.0222 ECN_2pcet_2hr 0.0174 0.0141 0.0146 0.0163 0.0145 0.0147 0.0108 0.0112 0.0136 0.0212 0.0148 0.0028 0.0146 ECN_2pet_30min 0.0281 0.0257 0.0263 0.0184 0.0201 0.0313 0.0172 0.0190 0.0217 0.0187 0.0226 0.0046 0.0209 ECN_2pet_3hr 0.0132 0.0131 0.0155 0.0118 0.0081 0.0129 0.0088 0.0157 0.0102 0.0167 0.0126 0.0028 0.0130 ECN_2pet_45min 0.0280 0.0267 0.0186 0.0231 0.0205 0.0164 0.0185 0.0238 0.0150 0.0181 0.0209 0.0041 0.0195 CRITICAL DURATION : The critical duration for the 2% AEP is the ensemble ECN_2pct_10min. The median pattern for this ensemble is storm 8 (storm name : ECN_2pct_10min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_2pct_10min_10). AEP: 20% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median
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ECN_20pet_10min 0.0194 0.0203 0.0203 0.0205 0.0177 0.0169 0.0202 0.0180 0.0216 0.0191 0.0194 0.0014 0.0198 ECN_20pet_15min 0.0202 0.0228 0.0204 0.0188 0.0158 0.0150 0.0141 0.0152 0.0180 0.0206 0.0181 0.0028 0.0184 ECN_20pet_1_Shr 0.0103 0.0141 0.0140 0.0079 0.0144 0.0116 0.0089 0.0107 0.0147 0.0111 0.0118 0.0023 0.0113 ECN_20pet_lhr 0.0172 0.0099 0.0129 0.0136 0.0154 0.0136 0.0117 0.0103 0.0138 0.0110 0.0129 0.0022 0.0132 ECN_20pet_20min 0.0201 0.0198 0.0178 0.0144 0.0143 0.0181 0.0171 0.0145 0.0180 0.0205 0.0175 0.0022 0.0179 ECN_20pet_25min 0.0143 0.0145 0.0158 0.0152 0.0176 0.0161 0.0136 0.0125 0.0170 0.0174 0.0154 0.0016 0.0155 ECN_20pet_2hr 0.0092 0.0125 0.0105 0.0083 0.0130 0.0111 0.0148 0.0247 0.0098 0.0086 0.0123 0.0046 0.0108 ECN_20pcet_30min 0.0171 0.0139 0.0164 0.0164 0.0121 0.0157 0.0178 0.0173 0.0130 0.0152 0.0155 0.0018 0.0160 ECN_20pet_3hr 0.0088 0.0099 0.0121 0.0083 0.0065 0.0060 0.0071 0.0053 0.0066 0.0080 0.0078 0.0019 0.0075 ECN_20pet_45min 0.0191 0.0135 0.0123 0.0147 0.0182 0.0100 0.0111 0.0104 0.0151 0.0140 0.0138 0.0029 0.0137 CRITICAL DURATION : The critical duration for the 20% AEP is the ensemble ECN_20pct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_20pct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_20pct_10min_9). REP: 5% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_5pet_10min 0.0251 0.0245 0.0268 0.0290 0.0230 0.0235 0.0252 0.0227 0.0244 0.0278 0.0252 0.0020 0.0248 ECN_5pet_15min 0.0282 0.0277 0.0279 0.0224 0.0206 0.0239 0.0225 0.0211 0.0264 0.0244 0.0245 0.0027 0.0242 ECN_5pet_1_5hr 0.0181 0.0134 0.0169 0.0210 0.0155 0.0146 0.0136 0.0182 0.0109 0.0164 0.0159 0.0028 0.0160 ECN_5pcet_lhr 0.0220 0.0186 0.0201 0.0291 0.0144 0.0179 0.0146 0.0143 0.0141 0.0245 0.0190 0.0048 0.0182 ECN_5pet_20min 0.0212 0.0233 0.0174 0.0186 0.0197 0.0198 0.0180 0.0225 0.0245 0.0228 0.0208 0.0023 0.0205 ECN_5pet_25min 0.0172 0.0237 0.0257 0.0219 0.0260 0.0227 0.0219 0.0182 0.0232 0.0236 0.0224 0.0027 0.0230 ECN_5pcet_2hr 0.0154 0.0104 0.0135 0.0197 0.0164 0.0198 0.0209 0.0119 0.0138 0.0188 0.0161 0.0035 0.0159 ECN_5pet_30min 0.0205 0.0220 0.0336 0.0181 0.0168 0.0175 0.0207 0.0184 0.0200 0.0178 0.0205 0.0046 0.0192 ECN_5pcet_3hr 0.0157 0.0097 0.0138 0.0129 0.0112 0.0071 0.0109 0.0081 0.0095 0.0095 0.0108 0.0025 0.0103 ECN_5pet_45min 0.0263 0.0219 0.0215 0.0139 0.0151 0.0169 0.0159 0.0139 0.0194 0.0221 0.0187 0.0040 0.0181 CRITICAL DURATION : The critical duration for the 5% AEP is the ensemble ECN_S5pct_l0min. The median pattern for this ensemble is storm 1 (storm name : ECN_Spct_10min_1). The pattern with the greatest <Max Flow> for this ensemble is storm 4 (storm name : ECN_Spct_10min_4). AEP: 50% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_50pet_10min 0.0145 0.0152 0.0152 0.0153 0.0132 0.0126 0.0151 0.0135 0.0162 0.0143 0.0145 0.0010 0.0148 ECN_50pet_15min 0.0151 0.0171 0.0153 0.0141 0.0118 0.0111 0.0106 0.0114 0.0134 0.0154 0.0135 0.0021 0.0138 ECN_50pet_1_Shr 0.0076 0.0103 0.0103 0.0058 0.0106 0.0085 0.0065 0.0078 0.0107 0.0081 0.0086 0.0017 0.0083 ECN_50pet_1hr 0.0127 0.0073 0.0094 0.0101 0.0113 0.0100 0.0086 0.0076 0.0102 0.0081 0.0095 0.0016 0.0097 ECN_50pet_20min 0.0150 0.0148 0.0133 0.0108 0.0107 0.0135 0.0127 0.0108 0.0134 0.0153 0.0130 0.0017 0.0134 ECN_50pet_25min 0.0107 0.0108 0.0118 0.0114 0.0131 0.0120 0.0101 0.0093 0.0127 0.0130 0.0115 0.0012 0.0116 ECN_50pet_2hr 0.0067 0.0091 0.0076 0.0060 0.0095 0.0081 0.0107 0.0180 0.0071 0.0062 0.0089 0.0034 0.0079 ECN_50pet_30min 0.0127 0.0103 0.0122 0.0122 0.0089 0.0117 0.0132 0.0129 0.0097 0.0113 0.0115 0.0014 0.0119 ECN_50pet_3hr 0.0063 0.0070 0.0087 0.0060 0.0047 0.0043 0.0051 0.0038 0.0047 0.0057 0.0056 0.0014 0.0054 ECN_50pet_45min 0.0142 0.0099 0.0091 0.0108 0.0135 0.0074 0.0082 0.0077 0.0112 0.0104 0.0102 0.0022 0.0101 CRITICAL DURATION : The critical duration for the 50% AEP is the ensemble ECN_50pct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_5Qpct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_50pct_10min_9). REP: 63.2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_63pct_10min 0.0129 0.0135 0.0135 0.0136 0.0117 0.0112 0.0134 0.0120 0.0143 0.0127 0.0129 0.0009 0.0131 ECN_63pcet_15min 0.0135 0.0152 0.0136 0.0126 0.0105 0.0098 0.0094 0.0102 0.0119 0.0136 0.0120 0.0019 0.0122 ECN_63pet_1_Shr 0.0067 0.0091 0.0091 0.0051 0.0093 0.0076 0.0057 0.0069 0.0095 0.0071 0.0076 0.0015 0.0073 ECN_63pet_lhr 0.0112 0.0064 0.0083 0.0089 0.0100 0.0089 0.0076 0.0067 0.0090 0.0071 0.0084 0.0014 0.0086 ECN_63pet_20min 0.0133 0.0131 0.0118 0.0095 0.0095 0.0120 0.0113 0.0096 0.0119 0.0135 0.0116 0.0015 0.0119 ECN_63pcet_25min 0.0095 0.0096 0.0105 0.0101 0.0117 0.0107 0.0090 0.0083 0.0113 0.0115 0.0102 0.0011 0.0103 ECN_63pet_2hr 0.0059 0.0080 0.0067 0.0053 0.0083 0.0071 0.0094 0.0159 0.0063 0.0055 0.0078 0.0030 0.0069 ECN_63pcet_30min 0.0113 0.0092 0.0109 0.0109 0.0079 0.0103 0.0118 0.0114 0.0086 0.0100 0.0102 0.0012 0.0106 ECN_63pet_3hr 0.0055 0.0062 0.0076 0.0052 0.0041 0.0037 0.0044 0.0033 0.0042 0.0050 0.0049 0.0012 0.0047 ECN_63pcet_45min 0.0126 0.0088 0.0081 0.0096 0.0120 0.0066 0.0073 0.0068 0.0099 0.0092 0.0091 0.0019 0.0090 CRITICAL DURATION : The critical duration for the 63.2% AEP is the ensemble ECN_63pct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_63pct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (Storm name : ECN_63pct_10min_9).
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23098 - SBSMP/3
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Appendix J
XPSTORM POST DEVELOPMENT MITIGATED RESULTS
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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Summary information: INNOVYZE ENSEMBLE STATISTICS UTILITY (c) Innovyze 2020 6 Total No. of Ensembles: 70 7 No. of Storms per ensemble: 10 No. of AEP Bands: 7 Object Name: Result type: 13 Results: Linkl_High Flow 1 Max Flow AEP: 1% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_lpcet_10min 0.0163 0.0179 0.0144 0.0194 0.0192 0.0192 0.0182 0.0161 0.0215 0.0147 0.0177 0.0022 0.0181 ECN_lpet_15min 0.0202 0.0176 0.0121 0.0107 0.0179 0.0162 0.0155 0.0240 0.0191 0.0119 0.0165 0.0039 0.0169 ECN_lpet_1_Shr 0.0013 0.0114 0.0091 0.0025 0.0104 0.0086 0.0075 0.0127 0.0077 0.0092 0.0080 0.0034 0.0088 ECN_lp¢et_lhr 0.0204 0.0151 0.0078 0.0102 0.0042 0.0125 0.0060 0.0075 0.0097 0.0093 0.0103 0.0045 0.0095 ECN_lpet_20min 0.0167 0.0232 0.0135 0.0124 0.0122 0.0135 0.0105 0.0135 0.0143 0.0155 0.0145 0.0033 0.0135 ECN_lpet_25min 0.0155 0.0229 0.0144 0.0142 0.0166 0.0122 0.0117 0.0153 0.0129 0.0174 0.0153 0.0031 0.0148 ECN_lpcet_2hr 0.0056 0.0005 0.0045 0.0090 0.0079 0.0040 0.0050 0.0095 0.0058 0.0028 0.0053 ECN_lpet_30min 0.0167 0.0150 0.0217 0.0103 0.0113 0.0214 0.0115 0.0132 0.0161 0.0127 0.0150 0.0038 0.0141 ECN_lpcet_3hr 0.0054 0.0014 0.0070 0.0006 0.0081 0.0099 0.0054 0.0034 0.0062 ECN_lpet_45min 0.0225 0.0202 0.0091 0.0141 0.0125 0.0078 0.0096 0.0174 0.0051 0.0127 0.0131 0.0053 0.0126 CRITICAL DURATION : The critical duration for the 1% AEP is the ensemble ECN_lpct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_1pct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_1pct_10min_9). AEP: 10% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_10pet_10min 0.0000 0.0000 0.0000 ECN_10pet_15min 0.0002 0.0001 0.0002 0.0000 0.0002 ECN_10pet_1_Shr 0.0000 0.0000 0.0000 ECN_10pet_1hr 0.0003 0.0037 0.0020 0.0017 0.0020 ECN_10pet_20min 0.0006 0.0001 0.0074 0.0084 0.0041 0.0038 0.0040 ECN_10pet_25min 0.0081 0.0071 0.0057 0.0070 0.0010 0.0064 ECN_10pet_2hr 0.0025 0.0025 0.0000 0.0025 ECN_10pet_30min 0.0002 0.0008 0.0037 0.0016 0.0015 0.0005 ECN_10pet_3hr 0.0036 0.0036 0.0000 0.0036 ECN_10pet_45min 0.0028 0.0028 0.0000 0.0028 CRITICAL DURATION : The critical duration for the 10% AEP is the ensemble ECN_10pct_25min. The median pattern for this ensemble is storm 2 (storm name : ECN_10pct_25min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 1 (Storm name : ECN_10pct_25min_2). AEP: 2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_2pet_10min 0.0119 0.0126 0.0099 0.0137 0.0132 0.0136 0.0129 0.0126 0.0163 0.0090 0.0126 0.0019 0.0128 ECN_2pet_15min 0.0144 0.0111 0.0078 0.0082 0.0153 0.0145 0.0096 0.0211 0.0163 0.0089 0.0127 0.0041 0.0128 ECN_2pet_1_Shr 0.0059 0.0052 0.0051 0.0047 0.0062 0.0057 0.0088 0.0060 0.0013 0.0054 ECN_2pcet_lhr 0.0178 0.0124 0.0060 0.0081 0.0023 0.0101 0.0019 0.0075 0.0018 0.0075 0.0051 0.0067 ECN_2pet_20min 0.0156 0.0203 0.0088 0.0058 0.0099 0.0107 0.0085 0.0104 0.0088 0.0128 0.0112 0.0039 0.0101 ECN_2pet_25min 0.0069 0.0202 0.0091 0.0119 0.0114 0.0092 0.0097 0.0129 0.0093 0.0149 0.0116 0.0036 0.0106 ECN_2pcet_2hr 0.0068 0.0025 0.0047 0.0021 0.0047 ECN_2pet_30min 0.0141 0.0115 0.0192 0.0084 0.0091 0.0164 0.0095 0.0110 0.0137 0.0105 0.0123 0.0033 0.0113 ECN_2pet_3hr 0.0076 0.0076 0.0000 0.0076 ECN_2pet_45min 0.0199 0.0177 0.0047 0.0111 0.0085 0.0060 0.0077 0.0143 0.0036 0.0101 0.0103 0.0052 0.0093 CRITICAL DURATION : The critical duration for the 2% AEP is the ensemble ECN_2pct_10min. The median pattern for this ensemble is storm 7 (storm name : ECN_2pct_10min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_2pct_10min_9). AEP: 20% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median
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ECN_20pet_10min 0.0000 0.0000 0.0000 ECN_20pet_15min 0.0000 0.0000 0.0000 ECN_20pet_1_5Shr 0.0000 0.0000 0.0000 ECN_20pct_lhr 0.0000 0.0000 0.0000 ECN_20pet_20min 0.0000 0.0000 0.0000 ECN_20pet_25min 0.0000 0.0000 0.0000 ECN_20pct_2hr 0.0000 0.0000 0.0000 ECN_20pet_30min 0.0000 0.0000 0.0000 ECN_20pet_3hr 0.0000 0.0000 0.0000 ECN_20pet_45min 0.0000 0.0000 0.0000 CRITICAL DURATION : The critical duration for the 20% AEP is the ensemble The median pattern for this ensemble is storm 0 (storm name : ). The pattern with the greatest <Max Flow> for this ensemble is storm 0 (storm name : ). AEP: 5% - Max Flow (m*3/s) CRITICAL DURATION : The critical duration for the 63.2% AEP is the ensemble The median pattern for this ensemble is storm 0 (storm name : ). The pattern with the greatest <Max Flow> for this ensemble is storm 0 (storm name : ). Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_5pet_10min 0.0008 0.0000 0.0004 0.0001 0.0038 0.0011 0.0014 0.0003 ECN_5pet_15min 0.0023 0.0018 0.0036 0.0086 0.0087 0.0070 0.0039 0.0068 0.0123 0.0129 0.0068 0.0037 0.0069 ECN_5pet_1_5hr 0.0019 0.0005 0.0001 0.0011 0.0008 0.0009 0.0006 0.0006 ECN_5pcet_lhr 0.0130 0.0013 0.0026 0.0143 0.0078 0.0059 0.0078 ECN_5pet_20min 0.0039 0.0047 0.0069 0.0108 0.0090 0.0064 0.0075 0.0150 0.0164 0.0059 0.0086 0.0040 0.0072 ECN_5pet_25min 0.0056 0.0159 0.0010 0.0027 0.0005 0.0149 0.0059 0.0050 0.0049 0.0101 0.0067 0.0051 0.0053 ECN_5pcet_2hr 0.0115 0.0115 0.0000 0.0115 ECN_5pet_30min 0.0010 0.0111 0.0147 0.0066 0.0034 0.0067 0.0122 0.0035 0.0070 0.0101 0.0076 0.0041 0.0069 ECN_5pcet_3hr 0.0059 0.0059 0.0000 0.0059 ECN_5pet_45min 0.0046 0.0042 0.0080 0.0055 0.0016 0.0054 0.0118 0.0129 0.0067 0.0036 0.0055 CRITICAL DURATION : The critical duration for the 5% AEP is the ensemble ECN_5pct_2hr. The median pattern for this ensemble is storm 1 (storm name : ECN_Spct_2hr_4). The pattern with the greatest <Max Flow> for this ensemble is storm 1 (storm name : ECN_Spct_2hr 4). AEP: 50% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_50pet_10min 0.0000 0.0000 0.0000 ECN_50pet_15min 0.0000 0.0000 0.0000 ECN_50pet_1_Shr 0.0000 0.0000 0.0000 ECN_5O0pet_lhr 0.0000 0.0000 0.0000 ECN_50pet_20min 0.0000 0.0000 0.0000 ECN_50pet_25min 0.0000 0.0000 0.0000 1 ECN_50pet_2hr 0.0000 0.0000 0.0000 1 ECN_S5Opet_30min 0.0000 0.0000 0.0000 13 ECN_50pet_3hr 0.0000 0.0000 0.0000 1 ECN_50pet_45min 0.0000 0.0000 0.0000 1 1 CRITICAL DURATION : The critical duration for the 50% AEP is the ensemble 1 The median pattern for this ensemble is storm 0 (storm name : ). 1 The pattern with the greatest <Max Flow> for this ensemble is storm 0 (storm name : ). 1 1 1 1 AEP: 63.2% - Max Flow (m*3/s) 1 1 Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median 1 1 ECN_63pct_10min 0.0000 0.0000 0.0000 1 ECN_63pcet_15min 0.0000 0.0000 0.0000 1 ECN_63pet_1_Shr 0.0000 0.0000 0.0000 1 ECN_63pet_lhr 0.0000 0.0000 0.0000 1 ECN_63pet_20min 0.0000 0.0000 0.0000 1 ECN_63pcet_25min 0.0000 0.0000 0.0000 1 ECN_63pet_2hr 0.0000 0.0000 0.0000 1 ECN_63pet_30min 0.0000 0.0000 0.0000 1 ECN_63pet_3hr 0.0000 0.0000 0.0000 1 ECN_63pcet_45min 0.0000 0.0000 0.0000 1 1 1 1 1 1
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INNOVYZE ENSEMBLE STATISTICS UTILITY (c) Innovyze 2020 Summary information: 6 Total No. of Ensembles: 70 7 No. of Storms per ensemble: 10 8 No. of AEP Bands: 7 9 Object Name: Linkl_Low Flow 1 0 Result type: Max Flow 2 13. Results: AEP: 1% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_lpcet_10min 0.0107 0.0105 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0105 0.0108 0.0105 0.0001 0.0104 ECN_lpet_15min 0.0105 0.0104 0.0104 0.0104 0.0104 0.0105 0.0105 0.0107 0.0105 0.0104 0.0105 0.0001 0.0105 ECN_lpet_1_Shr 0.0104 0.0104 0.0104 0.0104 0.0105 0.0105 0.0104 0.0104 0.0104 0.0104 0.0104 0.0000 0.0104 ECN_lp¢et_lhr 0.0105 0.0104 0.0104 0.0104 0.0104 0.0104 0.0105 0.0105 0.0104 0.0105 0.0104 0.0000 0.0104 ECN_lpet_20min 0.0105 0.0107 0.0104 0.0104 0.0104 0.0105 0.0104 0.0104 0.0105 0.0104 0.0105 0.0001 0.0104 ECN_lpet_25min 0.0104 0.0106 0.0104 0.0104 0.0104 0.0104 0.0106 0.0104 0.0104 0.0104 0.0105 0.0001 0.0104 ECN_lpcet_2hr 0.0104 0.0104 0.0104 0.0104 0.0104 0.0105 0.0099 0.0099 0.0104 0.0106 0.0103 0.0002 0.0104 ECN_lpet_30min 0.0105 0.0104 0.0105 0.0104 0.0104 0.0105 0.0104 0.0104 0.0110 0.0104 0.0105 0.0002 0.0104 ECN_lpcet_3hr 0.0104 0.0104 0.0104 0.0104 0.0095 0.0104 0.0087 0.0104 0.0085 0.0104 0.0099 0.0007 0.0104 ECN_lpet_45min 0.0106 0.0107 0.0104 0.0104 0.0105 0.0104 0.0104 0.0104 0.0104 0.0104 0.0105 0.0001 0.0104 CRITICAL DURATION : The critical duration for the 1% AEP is the ensemble ECN_lpct_15min. The median pattern for this ensemble is storm 7 (storm name : ECN_1pct_15min_7). The pattern with the greatest <Max Flow> for this ensemble is storm 8 (storm name : ECN_lpct_15min_8). AEP: 10% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_10pet_10min 0.0097 0.0097 0.0095 0.0095 0.0098 0.0097 0.0099 0.0097 0.0097 0.0098 0.0097 0.0001 0.0097 ECN_10pet_15min 0.0098 0.0098 0.0099 0.0103 0.0102 0.0101 0.0101 0.0102 0.0104 0.0105 0.0101 0.0002 0.0101 ECN_10pet_1_Shr 0.0096 0.0087 0.0095 0.0095 0.0095 0.0093 0.0080 0.0085 0.0082 0.0094 0.0090 0.0006 0.0093 ECN_10pet_1hr 0.0104 0.0091 0.0095 0.0092 0.0094 0.0090 0.0097 0.0095 0.0090 0.0104 0.0095 0.0005 0.0094 ECN_10pet_20min 0.0099 0.0100 0.0102 0.0104 0.0103 0.0104 0.0103 0.0104 0.0104 0.0100 0.0102 0.0002 0.0103 ECN_10pet_25min 0.0101 0.0104 0.0097 0.0098 0.0096 0.0106 0.0102 0.0103 0.0100 0.0104 0.0101 0.0003 0.0102 ECN_10pet_2hr 0.0088 0.0079 0.0082 0.0104 0.0090 0.0082 0.0086 0.0077 0.0087 0.0080 0.0086 0.0007 0.0084 ECN_10pet_30min 0.0096 0.0103 0.0104 0.0100 0.0099 0.0101 0.0104 0.0103 0.0105 0.0104 0.0102 0.0003 0.0103 ECN_10pet_3hr 0.0104 0.0078 0.0081 0.0094 0.0085 0.0066 0.0079 0.0071 0.0079 0.0082 0.0082 0.0010 0.0080 ECN_10pet_45min 0.0103 0.0101 0.0101 0.0101 0.0098 0.0103 0.0094 0.0089 0.0104 0.0103 0.0100 0.0005 0.0101 CRITICAL DURATION : The critical duration for the 10% AEP is the ensemble ECN_10pct_30min. The median pattern for this ensemble is storm 8 (storm name : ECN_10pct_30min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (Storm name : ECN_10pct_30min_9). AEP: 2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_2pet_10min 0.0106 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0106 0.0104 0.0104 0.0105 0.0001 0.0104 ECN_2pet_15min 0.0104 0.0104 0.0104 0.0104 0.0104 0.0106 0.0104 0.0105 0.0104 0.0104 0.0104 0.0001 0.0104 ECN_2pet_1_Shr 0.0099 0.0104 0.0104 0.0101 0.0104 0.0104 0.0102 0.0104 0.0104 0.0107 0.0103 0.0002 0.0104 ECN_2pcet_lhr 0.0105 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0000 0.0104 ECN_2pet_20min 0.0108 0.0105 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0105 0.0001 0.0104 ECN_2pet_25min 0.0104 0.0105 0.0104 0.0105 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0000 0.0104 ECN_2pcet_2hr 0.0103 0.0097 0.0103 0.0102 0.0107 0.0100 0.0091 0.0091 0.0104 0.0104 0.0100 0.0005 0.0102 ECN_2pet_30min 0.0104 0.0107 0.0104 0.0104 0.0105 0.0106 0.0104 0.0104 0.0104 0.0104 0.0105 0.0001 0.0104 ECN_2pet_3hr 0.0101 0.0098 0.0102 0.0095 0.0086 0.0096 0.0079 0.0103 0.0078 0.0104 0.0094 0.0009 0.0097 ECN_2pet_45min 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0105 0.0104 0.0104 0.0104 0.0104 0.0000 0.0104 CRITICAL DURATION : The critical duration for the 2% AEP is the ensemble ECN_2pct_45min. The median pattern for this ensemble is storm 3 (storm name : ECN_2pct_45min_3). The pattern with the greatest <Max Flow> for this ensemble is storm 7 (storm name : ECN_2pct_45min_7). AEP: 20% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median
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ECN_20pet_10min 0.0088 0.0088 0.0088 0.0091 0.0089 0.0090 0.0088 0.0091 0.0087 0.0088 0.0089 0.0001 0.0088 ECN_20pet_15min 0.0090 0.0089 0.0090 0.0091 0.0093 0.0093 0.0094 0.0094 0.0096 0.0097 0.0093 0.0002 0.0093 ECN_20pet_1_Shr 0.0080 0.0089 0.0093 0.0066 0.0086 0.0062 0.0069 0.0083 0.0092 0.0087 0.0081 0.0011 0.0085 ECN_20pet_lhr 0.0097 0.0082 0.0089 0.0086 0.0086 0.0090 0.0079 0.0081 0.0088 0.0089 0.0087 0.0005 0.0087 ECN_20pet_20min 0.0088 0.0090 0.0090 0.0093 0.0093 0.0092 0.0096 0.0093 0.0097 0.0097 0.0093 0.0003 0.0093 ECN_20pet_25min 0.0092 0.0093 0.0088 0.0089 0.0090 0.0094 0.0096 0.0094 0.0100 0.0098 0.0093 0.0004 0.0093 ECN_20pet_2hr 0.0083 0.0076 0.0081 0.0075 0.0089 0.0062 0.0093 0.0085 0.0066 0.0075 0.0079 0.0009 0.0078 ECN_20pcet_30min 0.0101 0.0087 0.0086 0.0086 0.0093 0.0092 0.0094 0.0096 0.0093 0.0096 0.0092 0.0005 0.0093 ECN_20pet_3hr 0.0084 0.0089 0.0100 0.0070 0.0066 0.0057 0.0058 0.0053 0.0061 0.0081 0.0072 0.0015 0.0068 ECN_20pet_45min 0.0091 0.0089 0.0083 0.0093 0.0086 0.0084 0.0084 0.0086 0.0094 0.0091 0.0088 0.0004 0.0087 CRITICAL DURATION : The critical duration for the 20% AEP is the ensemble ECN_20pct_30min. The median pattern for this ensemble is storm 9 (storm name : ECN_20pct_30min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 1 (storm name : ECN_20pct_30min_1). REP: 5% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_5pet_10min 0.0104 0.0103 0.0102 0.0102 0.0104 0.0104 0.0105 0.0104 0.0103 0.0104 0.0104 0.0001 0.0104 ECN_5pet_15min 0.0104 0.0104 0.0106 0.0104 0.0106 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0001 0.0104 ECN_5pet_1_5hr 0.0104 0.0098 0.0104 0.0104 0.0104 0.0103 0.0088 0.0094 0.0090 0.0104 0.0099 0.0006 0.0103 ECN_5pcet_lhr 0.0104 0.0101 0.0104 0.0101 0.0103 0.0101 0.0104 0.0104 0.0100 0.0105 0.0103 0.0002 0.0103 ECN_5pet_20min 0.0104 0.0106 0.0107 0.0104 0.0104 0.0105 0.0104 0.0105 0.0105 0.0104 0.0105 0.0001 0.0104 ECN_5pet_25min 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0105 0.0104 0.0000 0.0104 ECN_5pcet_2hr 0.0099 0.0087 0.0090 0.0104 0.0101 0.0090 0.0095 0.0086 0.0098 0.0088 0.0094 0.0006 0.0093 ECN_5pet_30min 0.0104 0.0106 0.0104 0.0105 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0104 0.0001 0.0104 ECN_5pcet_3hr 0.0104 0.0087 0.0088 0.0104 0.0096 0.0077 0.0089 0.0082 0.0090 0.0091 0.0091 0.0008 0.0089 ECN_5pet_45min 0.0104 0.0106 0.0104 0.0104 0.0104 0.0104 0.0103 0.0100 0.0105 0.0104 0.0104 0.0001 0.0104 CRITICAL DURATION : The critical duration for the 5% AEP is the ensemble ECN_Spct_20min. The median pattern for this ensemble is storm 8 (storm name : ECN_Spct_20min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 3 (storm name : ECN_Spct_20min_3). AEP: 50% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_50pet_10min 0.0074 0.0073 0.0073 0.0075 0.0075 0.0075 0.0073 0.0076 0.0073 0.0074 0.0074 0.0001 0.0074 ECN_50pet_15min 0.0074 0.0072 0.0076 0.0075 0.0076 0.0079 0.0080 0.0079 0.0082 0.0082 0.0077 0.0003 0.0078 ECN_50pet_1_Shr 0.0058 0.0068 0.0075 0.0052 0.0068 0.0050 0.0054 0.0061 0.0074 0.0066 0.0063 0.0008 0.0063 ECN_50pet_1hr 0.0080 0.0060 0.0072 0.0068 0.0067 0.0072 0.0057 0.0060 0.0069 0.0068 0.0067 0.0006 0.0068 ECN_50pet_20min 0.0072 0.0075 0.0072 0.0079 0.0076 0.0074 0.0081 0.0077 0.0082 0.0081 0.0077 0.0003 0.0076 ECN_50pet_25min 0.0076 0.0077 0.0070 0.0071 0.0073 0.0078 0.0080 0.0076 0.0083 0.0082 0.0076 0.0004 0.0076 ECN_50pet_2hr 0.0061 0.0055 0.0060 0.0055 0.0069 0.0052 0.0074 0.0064 0.0052 0.0055 0.0060 0.0007 0.0058 ECN_50pet_30min 0.0084 0.0069 0.0068 0.0067 0.0075 0.0077 0.0078 0.0081 0.0076 0.0078 0.0075 0.0005 0.0077 ECN_50pet_3hr 0.0060 0.0068 0.0080 0.0054 0.0050 0.0044 0.0049 0.0041 0.0050 0.0057 0.0055 0.0011 0.0052 ECN_50pet_45min 0.0076 0.0073 0.0064 0.0077 0.0066 0.0064 0.0064 0.0064 0.0075 0.0071 0.0069 0.0005 0.0069 CRITICAL DURATION : The critical duration for the 50% AEP is the ensemble ECN_50pct_15min. The median pattern for this ensemble is storm 6 (storm name : ECN_SOpct_15min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_S50pct_15min_10). REP: 63.2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_63pct_10min 0.0066 0.0063 0.0063 0.0071 0.0067 0.0068 0.0063 0.0068 0.0066 0.0066 0.0066 0.0002 0.0066 ECN_63pcet_15min 0.0066 0.0065 0.0068 0.0067 0.0068 0.0071 0.0069 0.0068 0.0074 0.0074 0.0069 0.0003 0.0068 ECN_63pet_1_Shr 0.0054 0.0059 0.0066 0.0049 0.0059 0.0044 0.0052 0.0056 0.0066 0.0058 0.0056 0.0007 0.0057 ECN_63pet_lhr 0.0071 0.0056 0.0063 0.0061 0.0060 0.0063 0.0052 0.0055 0.0061 0.0059 0.0060 0.0005 0.0060 ECN_63pet_20min 0.0065 0.0066 0.0064 0.0071 0.0068 0.0066 0.0073 0.0068 0.0072 0.0072 0.0069 0.0003 0.0068 ECN_63pcet_25min 0.0068 0.0068 0.0063 0.0064 0.0064 0.0069 0.0071 0.0068 0.0077 0.0074 0.0069 0.0004 0.0068 ECN_63pet_2hr 0.0056 0.0052 0.0056 0.0052 0.0060 0.0049 0.0065 0.0059 0.0049 0.0052 0.0055 0.0005 0.0054 ECN_63pcet_30min 0.0078 0.0063 0.0061 0.0059 0.0066 0.0069 0.0069 0.0074 0.0067 0.0068 0.0067 0.0005 0.0068 ECN_63pet_3hr 0.0054 0.0059 0.0069 0.0051 0.0045 0.0038 0.0043 0.0035 0.0043 0.0052 0.0049 0.0010 0.0048 ECN_63pcet_45min 0.0066 0.0064 0.0058 0.0068 0.0059 0.0058 0.0057 0.0057 0.0066 0.0063 0.0062 0.0004 0.0061 CRITICAL DURATION : The critical duration for the 63.2% AEP is the ensemble ECN_63pct_25min. The median pattern for this ensemble is storm 8 (storm name : ECN_63pct_25min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (Storm name : ECN_63pct_25min_9).
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INNOVYZE ENSEMBLE STATISTICS UTILITY (c) Innovyze 2020 Summary information: 6 Total No. of Ensembles: 70 7 No. of Storms per ensemble: 10 8 No. of AEP Bands: 7 9 Object Name: Link2_Low Flow 2 0 Result type: Max Flow 2 13. Results: AEP: 1% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_lpcet_10min 0.0111 0.0115 0.0111 0.0117 0.0116 0.0116 0.0115 0.0112 0.0122 0.0110 0.0115 0.0003 0.0115 ECN_lpet_15min 0.0123 0.0125 0.0110 0.0112 0.0126 0.0121 0.0115 0.0130 0.0120 0.0114 0.0120 0.0006 0.0121 ECN_lpet_1_Shr 0.0087 0.0095 0.0103 0.0092 0.0096 0.0098 0.0093 0.0105 0.0096 0.0100 0.0096 0.0005 0.0096 ECN_lp¢et_lhr 0.0116 0.0111 0.0098 0.0106 0.0087 0.0108 0.0093 0.0099 0.0101 0.0093 0.0101 0.0009 0.0100 ECN_lpet_20min 0.0113 0.0128 0.0112 0.0108 0.0111 0.0120 0.0113 0.0117 0.0117 0.0126 0.0117 0.0006 0.0115 ECN_lpet_25min 0.0108 0.0131 0.0118 0.0116 0.0120 0.0114 0.0108 0.0124 0.0113 0.0130 0.0118 0.0008 0.0117 ECN_lpcet_2hr 0.0095 0.0088 0.0084 0.0087 0.0099 0.0089 0.0079 0.0080 0.0087 0.0090 0.0088 0.0006 0.0088 ECN_lpet_30min 0.0104 0.0116 0.0132 0.0105 0.0108 0.0122 0.0110 0.0118 0.0117 0.0107 0.0114 0.0008 0.0113 ECN_lpcet_3hr 0.0087 0.0086 0.0094 0.0081 0.0066 0.0086 0.0063 0.0095 0.0063 0.0103 0.0082 0.0013 0.0086 ECN_lpet_45min 0.0127 0.0116 0.0098 0.0118 0.0107 0.0098 0.0104 0.0124 0.0092 0.0107 0.0109 0.0011 0.0107 CRITICAL DURATION : The critical duration for the 1% AEP is the ensemble ECN_lpct_15min. The median pattern for this ensemble is storm 6 (storm name : ECN_Ipct_15min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 8 (storm name : ECN_lpct_15min_8). AEP: 10% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_10pet_10min 0.0092 0.0092 0.0090 0.0090 0.0094 0.0093 0.0095 0.0094 0.0092 0.0095 0.0093 0.0002 0.0093 ECN_10pet_15min 0.0088 0.0090 0.0089 0.0095 0.0093 0.0090 0.0092 0.0092 0.0099 0.0098 0.0092 0.0004 0.0092 ECN_10pet_1_Shr 0.0082 0.0066 0.0079 0.0086 0.0073 0.0072 0.0062 0.0073 0.0055 0.0073 0.0072 0.0009 0.0073 ECN_10pet_1hr 0.0087 0.0073 0.0079 0.0084 0.0081 0.0074 0.0077 0.0080 0.0072 0.0092 0.0080 0.0006 0.0080 ECN_10pet_20min 0.0091 0.0087 0.0089 0.0093 0.0095 0.0091 0.0087 0.0097 0.0098 0.0086 0.0091 0.0004 0.0091 ECN_10pet_25min 0.0084 0.0096 0.0082 0.0086 0.0086 0.0098 0.0087 0.0087 0.0090 0.0093 0.0089 0.0005 0.0087 ECN_10pet_2hr 0.0072 0.0054 0.0069 0.0088 0.0065 0.0075 0.0069 0.0056 0.0072 0.0068 0.0069 0.0009 0.0069 ECN_10pet_30min 0.0082 0.0095 0.0094 0.0080 0.0079 0.0089 0.0092 0.0088 0.0088 0.0090 0.0088 0.0005 0.0088 ECN_10pet_3hr 0.0085 0.0056 0.0067 0.0075 0.0064 0.0044 0.0058 0.0050 0.0055 0.0055 0.0061 0.0012 0.0057 ECN_10pet_45min 0.0091 0.0088 0.0090 0.0080 0.0078 0.0082 0.0074 0.0065 0.0091 0.0087 0.0083 0.0008 0.0084 CRITICAL DURATION : The critical duration for the 10% AEP is the ensemble ECN_10pct_10min. The median pattern for this ensemble is storm 6 (storm name : ECN_10pct_10min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 7 (Storm name : ECN_10pct_10min_7). AEP: 2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_2pet_10min 0.0104 0.0106 0.0104 0.0107 0.0107 0.0107 0.0106 0.0105 0.0110 0.0103 0.0106 0.0002 0.0106 ECN_2pet_15min 0.0111 0.0111 0.0103 0.0104 0.0112 0.0109 0.0105 0.0117 0.0109 0.0105 0.0108 0.0004 0.0109 ECN_2pet_1_Shr 0.0080 0.0086 0.0093 0.0086 0.0087 0.0089 0.0087 0.0098 0.0086 0.0090 0.0088 0.0005 0.0087 ECN_2pcet_lhr 0.0106 0.0102 0.0089 0.0098 0.0081 0.0100 0.0087 0.0092 0.0093 0.0088 0.0094 0.0007 0.0092 ECN_2pet_20min 0.0105 0.0116 0.0104 0.0100 0.0103 0.0108 0.0104 0.0106 0.0107 0.0112 0.0107 0.0004 0.0105 ECN_2pet_25min 0.0100 0.0119 0.0107 0.0105 0.0107 0.0104 0.0100 0.0109 0.0105 0.0114 0.0107 0.0006 0.0106 ECN_2pcet_2hr 0.0088 0.0082 0.0080 0.0083 0.0089 0.0084 0.0069 0.0069 0.0080 0.0083 0.0081 0.0007 0.0082 ECN_2pet_30min 0.0100 0.0105 0.0119 0.0097 0.0101 0.0111 0.0102 0.0106 0.0106 0.0100 0.0105 0.0006 0.0104 ECN_2pet_3hr 0.0081 0.0081 0.0088 0.0072 0.0057 0.0080 0.0057 0.0090 0.0057 0.0094 0.0076 0.0014 0.0080 ECN_2pet_45min 0.0112 0.0107 0.0090 0.0104 0.0099 0.0089 0.0096 0.0109 0.0085 0.0100 0.0099 0.0009 0.0100 CRITICAL DURATION : The critical duration for the 2% AEP is the ensemble ECN_2pct_15min. The median pattern for this ensemble is storm 6 (storm name : ECN_2pct_15min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 8 (storm name : ECN_2pct_15min_8). AEP: 20% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median
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ECN_20pet_10min 0.0083 0.0082 0.0082 0.0088 0.0085 0.0085 0.0083 0.0086 0.0082 0.0084 0.0084 0.0002 0.0083 ECN_20pet_15min 0.0082 0.0079 0.0079 0.0081 0.0082 0.0083 0.0084 0.0084 0.0088 0.0089 0.0083 0.0003 0.0083 ECN_20pet_1_Shr 0.0058 0.0073 0.0079 0.0051 0.0075 0.0052 0.0055 0.0064 0.0079 0.0066 0.0065 0.0011 0.0065 ECN_20pet_lhr 0.0086 0.0060 0.0071 0.0077 0.0071 0.0076 0.0055 0.0059 0.0075 0.0066 0.0070 0.0009 0.0071 ECN_20pet_20min 0.0072 0.0079 0.0079 0.0081 0.0081 0.0076 0.0088 0.0080 0.0085 0.0087 0.0081 0.0005 0.0081 ECN_20pet_25min 0.0081 0.0080 0.0081 0.0080 0.0082 0.0084 0.0084 0.0078 0.0088 0.0085 0.0082 0.0003 0.0082 ECN_20pet_2hr 0.0061 0.0057 0.0064 0.0054 0.0070 0.0054 0.0082 0.0082 0.0052 0.0054 0.0063 0.0011 0.0059 ECN_20pcet_30min 0.0088 0.0075 0.0078 0.0072 0.0076 0.0085 0.0082 0.0087 0.0080 0.0081 0.0080 0.0005 0.0080 ECN_20pet_3hr 0.0058 0.0068 0.0081 0.0054 0.0047 0.0041 0.0048 0.0038 0.0047 0.0053 0.0053 0.0012 0.0050 ECN_20pet_45min 0.0083 0.0081 0.0065 0.0081 0.0070 0.0064 0.0063 0.0060 0.0080 0.0077 0.0072 0.0008 0.0074 CRITICAL DURATION : The critical duration for the 20% AEP is the ensemble ECN_20pct_10min. The median pattern for this ensemble is storm 10 (storm name : ECN_20pct_10min_10). The pattern with the greatest <Max Flow> for this ensemble is storm 4 (storm name : ECN_20pct_10min_4). REP: 5% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_5pet_10min 0.0100 0.0100 0.0098 0.0098 0.0101 0.0100 0.0103 0.0102 0.0100 0.0103 0.0101 0.0002 0.0100 ECN_5pet_15min 0.0095 0.0098 0.0096 0.0101 0.0099 0.0096 0.0100 0.0099 0.0104 0.0103 0.0099 0.0003 0.0099 ECN_5pet_1_5hr 0.0089 0.0077 0.0088 0.0095 0.0082 0.0084 0.0071 0.0083 0.0063 0.0082 0.0081 0.0009 0.0083 ECN_5pcet_lhr 0.0094 0.0084 0.0088 0.0090 0.0088 0.0083 0.0085 0.0088 0.0081 0.0101 0.0088 0.0006 0.0088 ECN_5pet_20min 0.0099 0.0095 0.0098 0.0100 0.0101 0.0098 0.0094 0.0106 0.0106 0.0093 0.0099 0.0004 0.0098 ECN_5pet_25min 0.0091 0.0105 0.0088 0.0093 0.0093 0.0105 0.0095 0.0094 0.0095 0.0103 0.0096 0.0006 0.0094 ECN_5pcet_2hr 0.0083 0.0059 0.0080 0.0097 0.0076 0.0083 0.0082 0.0061 0.0083 0.0081 0.0079 0.0011 0.0081 ECN_5pet_30min 0.0089 0.0101 0.0100 0.0087 0.0087 0.0095 0.0100 0.0094 0.0096 0.0098 0.0095 0.0005 0.0095 ECN_5pcet_3hr 0.0098 0.0065 0.0078 0.0085 0.0077 0.0051 0.0069 0.0055 0.0065 0.0064 0.0071 0.0013 0.0067 ECN_5pet_45min 0.0099 0.0098 0.0098 0.0086 0.0086 0.0089 0.0084 0.0075 0.0100 0.0093 0.0091 0.0008 0.0091 CRITICAL DURATION : The critical duration for the 5% AEP is the ensemble ECN_S5pct_l0min. The median pattern for this ensemble is storm 9 (storm name : ECN_Spct_1l0min_9). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN Spct_10min_10). AEP: 50% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_50pet_10min 0.0064 0.0063 0.0064 0.0068 0.0067 0.0068 0.0064 0.0069 0.0064 0.0065 0.0066 0.0002 0.0065 ECN_50pet_15min 0.0063 0.0061 0.0059 0.0060 0.0062 0.0064 0.0065 0.0064 0.0071 0.0071 0.0064 0.0004 0.0063 ECN_50pet_1_Shr 0.0050 0.0056 0.0057 0.0038 0.0057 0.0040 0.0044 0.0051 0.0058 0.0052 0.0050 0.0007 0.0051 ECN_50pet_1hr 0.0064 0.0050 0.0055 0.0057 0.0056 0.0055 0.0049 0.0050 0.0056 0.0052 0.0054 0.0004 0.0055 ECN_50pet_20min 0.0057 0.0059 0.0059 0.0060 0.0061 0.0056 0.0069 0.0060 0.0067 0.0068 0.0061 0.0004 0.0060 ECN_50pet_25min 0.0061 0.0060 0.0060 0.0060 0.0062 0.0063 0.0063 0.0055 0.0071 0.0066 0.0062 0.0004 0.0062 ECN_50pet_2hr 0.0048 0.0049 0.0051 0.0043 0.0051 0.0045 0.0059 0.0063 0.0040 0.0043 0.0049 0.0007 0.0049 ECN_50pet_30min 0.0070 0.0057 0.0059 0.0055 0.0055 0.0064 0.0060 0.0069 0.0057 0.0059 0.0061 0.0005 0.0059 ECN_50pet_3hr 0.0044 0.0050 0.0057 0.0041 0.0033 0.0030 0.0034 0.0027 0.0033 0.0039 0.0039 0.0009 0.0036 ECN_50pet_45min 0.0061 0.0059 0.0053 0.0059 0.0056 0.0050 0.0051 0.0050 0.0059 0.0057 0.0056 0.0004 0.0057 CRITICAL DURATION : The critical duration for the 50% AEP is the ensemble ECN_50pct_10min. The median pattern for this ensemble is storm 10 (storm name : ECN_5Opct_10min_10). The pattern with the greatest <Max Flow> for this ensemble is storm 8 (storm name : ECN_50pct_10min_8). REP: 63.2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_63pct_10min 0.0058 0.0058 0.0058 0.0065 0.0059 0.0059 0.0058 0.0061 0.0058 0.0059 0.0059 0.0002 0.0058 ECN_63pcet_15min 0.0057 0.0057 0.0055 0.0055 0.0057 0.0058 0.0057 0.0057 0.0062 0.0064 0.0058 0.0003 0.0057 ECN_63pet_1_Shr 0.0044 0.0053 0.0052 0.0031 0.0052 0.0037 0.0039 0.0047 0.0054 0.0048 0.0046 0.0007 0.0047 ECN_63pet_lhr 0.0058 0.0044 0.0052 0.0053 0.0053 0.0052 0.0042 0.0045 0.0053 0.0048 0.0050 0.0005 0.0052 ECN_63pet_20min 0.0055 0.0054 0.0055 0.0055 0.0056 0.0052 0.0060 0.0055 0.0059 0.0061 0.0056 0.0003 0.0055 ECN_63pcet_25min 0.0056 0.0055 0.0057 0.0056 0.0057 0.0057 0.0056 0.0052 0.0062 0.0059 0.0057 0.0002 0.0056 ECN_63pet_2hr 0.0043 0.0041 0.0048 0.0037 0.0048 0.0039 0.0054 0.0058 0.0035 0.0037 0.0044 0.0007 0.0042 ECN_63pcet_30min 0.0061 0.0054 0.0055 0.0053 0.0051 0.0058 0.0056 0.0060 0.0053 0.0055 0.0056 0.0003 0.0055 ECN_63pet_3hr 0.0039 0.0044 0.0052 0.0036 0.0029 0.0026 0.0030 0.0024 0.0029 0.0034 0.0034 0.0008 0.0032 ECN_63pcet_45min 0.0057 0.0054 0.0050 0.0055 0.0053 0.0045 0.0047 0.0046 0.0054 0.0054 0.0052 0.0004 0.0053 CRITICAL DURATION : The critical duration for the 63.2% AEP is the ensemble ECN_63pct_10min. The median pattern for this ensemble is storm 10 (storm name : ECN_63pct_10min_10). The pattern with the greatest <Max Flow> for this ensemble is storm 4 (storm name : ECN_63pct_10min_4).
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Summary information: INNOVYZE ENSEMBLE STATISTICS UTILITY (c) Innovyze 2020 6 Total No. of Ensembles: 70 7 No. of Storms per ensemble: 10 No. of AEP Bands: 7 Object Name: Result type: 13 Results: Link3_Low Flow 3 Max Flow AEP: 1% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_lpcet_10min 0.0105 0.0107 0.0106 0.0107 0.0107 0.0107 0.0106 0.0106 0.0109 0.0105 0.0106 0.0001 0.0106 ECN_lpet_15min 0.0118 0.0120 0.0111 0.0112 0.0119 0.0117 0.0114 0.0121 0.0116 0.0113 0.0116 0.0003 0.0117 ECN_lpet_1_Shr 0.0096 0.0109 0.0118 0.0098 0.0105 0.0111 0.0099 0.0107 0.0110 0.0114 0.0107 0.0007 0.0108 ECN_lp¢et_lhr 0.0126 0.0127 0.0115 0.0110 0.0104 0.0115 0.0100 0.0102 0.0113 0.0102 0.0111 0.0009 0.0111 ECN_lpet_20min 0.0119 0.0126 0.0115 0.0116 0.0118 0.0119 0.0120 0.0122 0.0119 0.0128 0.0120 0.0004 0.0119 ECN_lpet_25min 0.0118 0.0132 0.0118 0.0125 0.0129 0.0121 0.0120 0.0126 0.0124 0.0132 0.0125 0.0005 0.0125 ECN_lpcet_2hr 0.0100 0.0094 0.0100 0.0098 0.0114 0.0097 0.0089 0.0089 0.0101 0.0103 0.0099 0.0007 0.0099 ECN_lpet_30min 0.0113 0.0126 0.0133 0.0121 0.0114 0.0111 0.0125 0.0127 0.0129 0.0118 0.0122 0.0007 0.0123 ECN_lpcet_3hr 0.0098 0.0095 0.0099 0.0093 0.0084 0.0094 0.0077 0.0100 0.0076 0.0113 0.0093 0.0011 0.0094 ECN_lpet_45min 0.0132 0.0121 0.0109 0.0131 0.0122 0.0115 0.0108 0.0125 0.0109 0.0112 0.0118 0.0009 0.0118 CRITICAL DURATION : The critical duration for the 1% AEP is the ensemble ECN_lpct_25min. The median pattern for this ensemble is storm 4 (storm name : ECN_Ipct_25min_4). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_lpct_25min_10). AEP: 10% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_10pet_10min 0.0089 0.0089 0.0088 0.0088 0.0090 0.0090 0.0091 0.0090 0.0089 0.0091 0.0090 0.0001 0.0090 ECN_10pet_15min 0.0089 0.0090 0.0091 0.0095 0.0094 0.0092 0.0092 0.0094 0.0096 0.0097 0.0093 0.0002 0.0093 ECN_10pet_1_Shr 0.0087 0.0079 0.0085 0.0088 0.0085 0.0084 0.0068 0.0077 0.0071 0.0085 0.0081 0.0006 0.0084 ECN_10pet_1hr 0.0094 0.0082 0.0086 0.0083 0.0085 0.0082 0.0087 0.0086 0.0082 0.0099 0.0087 0.0005 0.0086 ECN_10pet_20min 0.0090 0.0090 0.0093 0.0095 0.0095 0.0095 0.0094 0.0098 0.0099 0.0091 0.0094 0.0003 0.0094 ECN_10pet_25min 0.0091 0.0099 0.0087 0.0088 0.0086 0.0098 0.0093 0.0093 0.0092 0.0097 0.0092 0.0004 0.0092 ECN_10pet_2hr 0.0079 0.0068 0.0073 0.0095 0.0082 0.0074 0.0077 0.0063 0.0080 0.0068 0.0076 0.0009 0.0076 ECN_10pet_30min 0.0086 0.0095 0.0095 0.0090 0.0089 0.0092 0.0095 0.0093 0.0096 0.0097 0.0093 0.0003 0.0094 ECN_10pet_3hr 0.0099 0.0067 0.0072 0.0085 0.0077 0.0056 0.0069 0.0058 0.0068 0.0071 0.0072 0.0012 0.0070 ECN_10pet_45min 0.0094 0.0091 0.0092 0.0091 0.0088 0.0093 0.0085 0.0080 0.0095 0.0094 0.0090 0.0004 0.0092 CRITICAL DURATION : The critical duration for the 10% AEP is the ensemble ECN_10pct_30min. The median pattern for this ensemble is storm 2 (storm name : ECN_10pct_30min_2). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_10pct_30min_10). AEP: 2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_2pet_10min 0.0100 0.0101 0.0101 0.0102 0.0102 0.0102 0.0102 0.0101 0.0104 0.0100 0.0101 0.0001 0.0101 ECN_2pet_15min 0.0108 0.0109 0.0104 0.0105 0.0109 0.0108 0.0106 0.0110 0.0107 0.0106 0.0107 0.0002 0.0107 ECN_2pet_1_Shr 0.0089 0.0100 0.0105 0.0091 0.0097 0.0101 0.0093 0.0100 0.0101 0.0103 0.0098 0.0005 0.0100 ECN_2pcet_lhr 0.0112 0.0112 0.0104 0.0103 0.0096 0.0105 0.0094 0.0096 0.0104 0.0094 0.0102 0.0006 0.0103 ECN_2pet_20min 0.0108 0.0115 0.0106 0.0106 0.0108 0.0108 0.0108 0.0109 0.0108 0.0115 0.0109 0.0003 0.0108 ECN_2pet_25min 0.0107 0.0121 0.0108 0.0112 0.0115 0.0109 0.0108 0.0113 0.0112 0.0120 0.0112 0.0005 0.0112 ECN_2pcet_2hr 0.0093 0.0088 0.0091 0.0092 0.0104 0.0091 0.0082 0.0082 0.0093 0.0094 0.0091 0.0006 0.0092 ECN_2pet_30min 0.0104 0.0112 0.0123 0.0108 0.0105 0.0104 0.0111 0.0113 0.0115 0.0107 0.0110 0.0006 0.0109 ECN_2pet_3hr 0.0091 0.0088 0.0093 0.0085 0.0077 0.0086 0.0069 0.0094 0.0066 0.0103 0.0085 0.0011 0.0087 ECN_2pet_45min 0.0119 0.0109 0.0101 0.0114 0.0108 0.0105 0.0101 0.0110 0.0101 0.0104 0.0107 0.0006 0.0106 CRITICAL DURATION : The critical duration for the 2% AEP is the ensemble ECN_2pct_25min. The median pattern for this ensemble is storm 4 (storm name : ECN_2pct_25min_4). The pattern with the greatest <Max Flow> for this ensemble is storm 2 (storm name : ECN_2pct_25min_2). AEP: 20% - Max Flow (m*3/s) * | Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median
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ECN_20pet_10min 0.0082 0.0082 0.0082 0.0085 0.0083 0.0083 0.0082 0.0084 0.0081 0.0082 0.0083 0.0001 0.0082 ECN_20pet_15min 0.0083 0.0082 0.0084 0.0084 0.0085 0.0086 0.0086 0.0086 0.0088 0.0089 0.0085 0.0002 0.0085 ECN_20pet_1_Shr 0.0069 0.0081 0.0085 0.0057 0.0080 0.0055 0.0059 0.0074 0.0084 0.0078 0.0072 0.0011 0.0076 ECN_20pet_lhr 0.0088 0.0073 0.0082 0.0080 0.0079 0.0083 0.0068 0.0071 0.0081 0.0081 0.0078 0.0006 0.0080 ECN_20pet_20min 0.0082 0.0083 0.0082 0.0086 0.0085 0.0084 0.0088 0.0085 0.0089 0.0089 0.0085 0.0003 0.0085 ECN_20pet_25min 0.0084 0.0085 0.0080 0.0081 0.0082 0.0086 0.0087 0.0085 0.0091 0.0089 0.0085 0.0003 0.0085 ECN_20pet_2hr 0.0074 0.0063 0.0072 0.0063 0.0081 0.0056 0.0085 0.0080 0.0057 0.0064 0.0069 0.0010 0.0068 ECN_20pcet_30min 0.0092 0.0080 0.0079 0.0079 0.0085 0.0085 0.0086 0.0088 0.0085 0.0087 0.0085 0.0004 0.0085 ECN_20pet_3hr 0.0074 0.0081 0.0090 0.0060 0.0056 0.0052 0.0053 0.0050 0.0055 0.0070 0.0064 0.0013 0.0058 ECN_20pet_45min 0.0084 0.0082 0.0075 0.0085 0.0078 0.0075 0.0075 0.0078 0.0085 0.0082 0.0080 0.0004 0.0080 CRITICAL DURATION : The critical duration for the 20% AEP is the ensemble ECN_20pct_15min. The median pattern for this ensemble is storm 6 (storm name : ECN_20pct_15min_6). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_20pct_15min_10). REP: 5% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_5pet_10min 0.0096 0.0095 0.0094 0.0094 0.0096 0.0096 0.0097 0.0096 0.0095 0.0096 0.0096 0.0001 0.0096 ECN_5pet_15min 0.0096 0.0096 0.0097 0.0101 0.0099 0.0098 0.0098 0.0100 0.0101 0.0102 0.0099 0.0002 0.0099 ECN_5pet_1_5hr 0.0095 0.0087 0.0094 0.0096 0.0094 0.0093 0.0080 0.0086 0.0082 0.0093 0.0090 0.0006 0.0093 ECN_5pcet_lhr 0.0102 0.0091 0.0095 0.0091 0.0094 0.0090 0.0095 0.0094 0.0090 0.0108 0.0095 0.0006 0.0094 ECN_5pet_20min 0.0098 0.0097 0.0100 0.0103 0.0101 0.0102 0.0100 0.0105 0.0106 0.0098 0.0101 0.0003 0.0101 ECN_5pet_25min 0.0099 0.0106 0.0094 0.0096 0.0094 0.0106 0.0102 0.0101 0.0098 0.0105 0.0100 0.0004 0.0100 ECN_5pcet_2hr 0.0089 0.0079 0.0082 0.0105 0.0090 0.0083 0.0087 0.0077 0.0088 0.0080 0.0086 0.0008 0.0085 ECN_5pet_30min 0.0094 0.0100 0.0102 0.0098 0.0097 0.0099 0.0103 0.0101 0.0104 0.0104 0.0100 0.0003 0.0101 ECN_5pcet_3hr 0.0111 0.0079 0.0082 0.0094 0.0087 0.0066 0.0080 0.0072 0.0080 0.0082 0.0083 0.0012 0.0081 ECN_5pet_45min 0.0102 0.0101 0.0099 0.0099 0.0096 0.0101 0.0093 0.0088 0.0104 0.0101 0.0098 0.0004 0.0100 CRITICAL DURATION : The critical duration for the 5% AEP is the ensemble ECN_Spct_20min. The median pattern for this ensemble is storm 5 (storm name : ECN_Spct_20min_5). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_Spct_20min_9). AEP: 50% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_50pet_10min 0.0065 0.0065 0.0065 0.0067 0.0066 0.0066 0.0065 0.0067 0.0064 0.0065 0.0065 0.0001 0.0065 ECN_50pet_15min 0.0065 0.0063 0.0066 0.0065 0.0067 0.0069 0.0070 0.0069 0.0073 0.0073 0.0068 0.0003 0.0068 ECN_50pet_1_Shr 0.0054 0.0059 0.0064 0.0048 0.0059 0.0044 0.0051 0.0055 0.0064 0.0058 0.0056 0.0006 0.0056 ECN_50pet_1hr 0.0070 0.0055 0.0062 0.0060 0.0059 0.0061 0.0051 0.0054 0.0060 0.0059 0.0059 0.0005 0.0059 ECN_50pet_20min 0.0062 0.0065 0.0063 0.0068 0.0066 0.0064 0.0071 0.0067 0.0073 0.0071 0.0067 0.0004 0.0067 ECN_50pet_25min 0.0066 0.0067 0.0060 0.0062 0.0063 0.0067 0.0069 0.0065 0.0075 0.0073 0.0067 0.0004 0.0066 ECN_50pet_2hr 0.0055 0.0052 0.0055 0.0051 0.0059 0.0049 0.0065 0.0059 0.0048 0.0051 0.0054 0.0005 0.0054 ECN_50pet_30min 0.0076 0.0061 0.0060 0.0058 0.0064 0.0067 0.0067 0.0072 0.0065 0.0067 0.0066 0.0005 0.0066 ECN_50pet_3hr 0.0054 0.0058 0.0068 0.0051 0.0044 0.0038 0.0042 0.0034 0.0043 0.0051 0.0048 0.0010 0.0047 ECN_50pet_45min 0.0065 0.0063 0.0057 0.0067 0.0059 0.0057 0.0056 0.0056 0.0066 0.0062 0.0061 0.0004 0.0060 CRITICAL DURATION : The critical duration for the 50% AEP is the ensemble ECN_50pct_15min. The median pattern for this ensemble is storm 8 (storm name : ECN_SOpct_15min_8). The pattern with the greatest <Max Flow> for this ensemble is storm 9 (storm name : ECN_50pct_15min_9). REP: 63.2% - Max Flow (m*3/s) Ensemble name Storm 1 Storm 2 Storm 3 Storm 4 Storm 5 Storm 6 Storm 7 Storm 8 Storm 9 Storm 10 Average Std. Dev. Median ECN_63pct_10min 0.0059 0.0058 0.0058 0.0062 0.0060 0.0060 0.0058 0.0060 0.0059 0.0059 0.0059 0.0001 0.0059 ECN_63pcet_15min 0.0059 0.0058 0.0059 0.0059 0.0060 0.0062 0.0060 0.0060 0.0065 0.0065 0.0061 0.0002 0.0060 ECN_63pet_1_Shr 0.0051 0.0055 0.0058 0.0043 0.0055 0.0038 0.0047 0.0052 0.0058 0.0054 0.0051 0.0006 0.0053 ECN_63pet_lhr 0.0062 0.0052 0.0057 0.0056 0.0056 0.0056 0.0047 0.0051 0.0056 0.0054 0.0055 0.0004 0.0056 ECN_63pet_20min 0.0057 0.0059 0.0058 0.0061 0.0059 0.0058 0.0064 0.0059 0.0064 0.0063 0.0060 0.0002 0.0059 ECN_63pcet_25min 0.0059 0.0059 0.0057 0.0057 0.0058 0.0060 0.0061 0.0059 0.0067 0.0065 0.0060 0.0003 0.0059 ECN_63pet_2hr 0.0052 0.0049 0.0052 0.0048 0.0055 0.0042 0.0058 0.0057 0.0042 0.0048 0.0050 0.0005 0.0051 ECN_63pcet_30min 0.0067 0.0057 0.0056 0.0054 0.0058 0.0060 0.0059 0.0065 0.0058 0.0059 0.0059 0.0004 0.0059 ECN_63pet_3hr 0.0050 0.0054 0.0059 0.0046 0.0038 0.0033 0.0037 0.0030 0.0037 0.0046 0.0043 0.0009 0.0042 ECN_63pcet_45min 0.0059 0.0058 0.0053 0.0059 0.0055 0.0053 0.0052 0.0052 0.0059 0.0057 0.0056 0.0003 0.0056 CRITICAL DURATION : The critical duration for the 63.2% AEP is the ensemble ECN_63pct_15min. The median pattern for this ensemble is storm 5 (storm name : ECN_63pct_15min_5). The pattern with the greatest <Max Flow> for this ensemble is storm 10 (storm name : ECN_63pct_15min_10).
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Appendix K
STORMWATER QUALITY OPERATION AND MAINTENANCE GUIDELINES
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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BIO-RETENTION
OPERATIONAL MANAGEMENT AND
MAINTENANCE GUIDELINE
PROPOSED TOWNHOUSE DEVELOPMENT
5 PEARL STREET, COOROY
COOROY
23098 - O&MG
D:\JOBS\23-Jobs\23098 - 5 Pearl Street, Cooroy\Civil\Reports\SBSMP\Working\Appendices\MCE Bio Retention Operational
Management & Maintenance Guideline - 21209 - Rev 0.doc
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Page 2
Table of Contents
1 INTRODUCTION .......................................................................................... 3
2 GENERAL .................................................................................................. 3
3 RESPONSIBILITY FOR INSPECTION ..................................................................... 3
4 DATA COLLECTION / STORAGE REQUIREMENTS ..................................................... 3
5 MAINTENANCE PROCEDURE............................................................................. 3
5.1 General .............................................................................................. 3
5.2 Inspections .......................................................................................... 4
5.3 Watering ............................................................................................ 5
5.4 Vegetation Management and Weed Control .................................................... 6
5.5 Validation Water Quality Testing ................................................................ 6
5.6 Equipment Needs .................................................................................. 6
5.7 Occupational Health and Safety ................................................................. 6
5.8 Public Safety ........................................................................................ 7
5.9 Disposal Requirements ............................................................................ 7
5.10 Access Issues ........................................................................................ 7
5.11 Bio-Retention Basin Resetting .................................................................... 7
Appendix A BIO-RETENTION BASIN MAINTENANCE CHECKLIST ..................................... 8
Bio-Retention Basin Operational Management and Maintenance Guideline
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Page 3 1 INTRODUCTION The water quality treatment for the proposed development includes a proposed bio-retention basin. This document provides an overview of the maintenance requirements for the bio- retention water quality device(s) on site to ensure that they are properly maintained. 2 GENERAL Bio-retention basins are vegetated areas where runoff is filtered through a filter media layer (e.g. sandy loam) as it percolates downwards. It is then collected via perforated underground drains and flows to downstream waterways or to storages for reuse. Bio-retention basins operate by filtering stormwater runoff through densely planted surface vegetation and then percolating runoff through a prescribed filter media. During percolation, pollutants are retained through fine filtration, adsorption and some biological uptake. The vegetation in a bio- retention system is a vital functional element of the system providing a substrate for biofilm growth within the upper layer of the filter media. The proposed bio-retention basin within the site will do much of the same. It has been designed to reduce the impact of the development on the downstream waterway environment. 3 RESPONSIBILITY FOR INSPECTION The principal involved consultancy will be required to appoint an appropriately qualified consultant maintenance contractor to carry out the inspections of the bio-retention basin during the construction and on-maintenance period. At the completion of the maintenance period the responsibility to undertake the inspections and generally maintain the basin will be shifted to Body Corporate. 4 DATA COLLECTION / STORAGE REQUIREMENTS Inspection records will be required for comparison of the performance of the system. In order to assist this process it is proposed that the Bio-retention Basin Maintenance Checklist prepared by Healthy Waterways (2006) be adopted for the site. Refer Appendix A for a copy of the checklist. Copies of the completed checklist are to be forwarded to the Morgan Consulting Engineers (or other consultant nominated by the Principal) and to be provided to Council at the expiry of the maintenance period and on request thereafter. 5 MAINTENANCE PROCEDURE 5.1 General Vegetation plays a key role in maintaining the porosity of the filter media of a bio-retention basin and a strong healthy growth of vegetation is critical to its performance. Therefore the most intensive period of maintenance is during the plant establishment period (i.e. first two years) when weed removal and replanting may be required. Bio-Retention Basin Operational Management and Maintenance Guideline
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Page 4
It is also the time when high sediment loads may impact on plant growth and infiltration rates.
For this reason, the bio-retention systems are to be initially turfed. Vegetation can be
introduced when construction has been completed on an appropriate percentage of the lots
draining to each bio-retention system.
Inflow systems and overflow systems require careful monitoring, as these can be prone to scour
and litter build up. Debris can block inlets or outlets and can be unsightly, particularly in high
visibility areas. Inspection and removal of debris should be done regularly, and debris should be
removed whenever it is observed on a site.
5.2 Inspections
5.2.1 General
The bio-retention basins treat stormwater runoff through the principles of sedimentation,
filtration and percolation. These devices do not incorporate the use of screens and require
minimal maintenance during their operation. However, the systems are subject to deposition of
sediment that is filtered through the media.
Routine inspections shall be undertaken on the bio-retention basins after every significant
rainfall event (30mm of rainfall in a 24 hour period) or on a three (3) monthly basis within the
first twelve (12) months and on a six (6) monthly basis thereafter. The requirements of the
inspection for the bio-retention basin shall include the following:
1. Check for build up of sediment at pipe inlet structures;
2. Check for sediment within sub-soil drainage lines;
3. Check all concrete structures for damage and deterioration;
4. Check for the build up of vegetation matter on the bed surface and removal of
vegetation matter to ensure minimal blockage to media;
5. Check achieved flow rate through the media is maintained in accordance with the design
requirements and anticipated compaction;
6. Check inflow systems, outlets and the under drainage pipe elements to identify and
remove any blockages such as litter build up.
5.2.2 Filter Media
The filter media will be inspected for sediment deposition of the bed of the bio-retention
basins and removed as required.
Bio-Retention Basin Operational Management and Maintenance Guideline
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Inspect for the accumulation of an impermeable layer (such as oily or clayey sediment) that
may have formed on the surface of the filter media. A symptom may be that water remains
ponded in the bio-retention basin for more than a few hours after a rain event. Repair minor
accumulations by raking away any mulch on the surface and scarifying the surface of the filter
media between plants. Any leaf litter should be removed to help maintain the surface porosity
of the filter media.
Ensure the perforated pipes are not blocked to prevent filter media and plants from becoming
waterlogged. A small steady clear flow of water may be observed discharging from the
perforated pipe at its connection into the downstream pit some hours after rainfall.
Note that smaller rainfall events after dry weather may be completely absorbed by the filter
media and not result in flow. Sub-soil drainage lines are to be flushed with clean water as
required to remove and blockage.
Sediment should be removed where it has smothered vegetation or caused blockages to the
inlets our outlet systems.
Any holes and or scouring apparent on the filter media will be repaired. Ensure no damage has
occurred to the inlet and outlet systems, if this has occurred repair as required.
5.2.3 Repair of Damage
Any accumulation of an impermeable layer, (such as oily or clayey sediment) that may have
formed on the surface of the filter media will be repaired. A symptom may be that water
remains ponded in the bio-retention basin for more than a few hours after a rain event. Repair
these minor accumulations by raking away any mulch on the surface and scarifying the surface
of the filter media between plants. Any leaf litter should be removed to help maintain the
surface porosity of the filter media.
5.3 Watering
Regular watering of the bio-retention basin vegetation is essential for successful establishment
and healthy growth. The frequency of watering to achieve successful establishment will depend
upon rainfall, maturity of planting stock and the water holding capacity of the soil.
The following watering program should be adequate following the installation of vegetation:
1. Week 1-2, 3 visits/week
2. Week 3-6, 2 visits/week
3. Week 7-12, 1 visit/week
After the first three month period, watering may still be required, particularly during the first
winter (dry period). Irrigation shall be undertaken in consultation with the Landscape Architect.
Bio-Retention Basin Operational Management and Maintenance Guideline
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Page 6 5.4 Vegetation Management and Weed Control Conventional surface mulching of the bio-retention basins with organic material like tanbark, should not be undertaken. Most organic mulch floats and runoff typically causes this material to be washed away with a risk of blocking drains. If weeds are observed within the bio-retention basin they shall be removed. Weeding will generally involve manual removal of the species. Vegetation planting densities are to be in accordance with the Landscape Architect’s design. Where necessary a biodegradable erosion mat can be applied the basin batters to help combat weed invasion and reduce the labour intensive maintenance requirements for weed removal. Herbicides are not recommended as a means of weed control. If required, however, their application is to be managed to avoid unintentional destruction of other vegetation or the introduction of chemicals that may contaminate the stormwater runoff. Where necessary, in areas that have been extensively weeded, the bio-retention basin shall be replanted with similar planting densities using suitable native species in accordance with the Landscape Architects design. Inspection of the existing vegetation is to take place and any dead or diseased vegetation shall be removed and replaced with suitable native species in accordance with the Landscape Architects design. The removal of plants, dead or diseased vegetation or weeds shall be disposed offsite at an appropriate waste management facility. All litter and debris present on the surface or batters of the bio-retention basins shall be removed and disposed offsite at an appropriate waste management facility. 5.5 Validation Water Quality Testing Validation water quality testing is not proposed for the site. 5.6 Equipment Needs The equipment required to undertake regular maintenance to the bio-retention basins will be standard hand held landscaping tools. No specific mechanical equipment is expected to be required for the maintenance of the basins unless resetting is required (refer Section 5.11). 5.7 Occupational Health and Safety The maintenance activities are to be undertaken in accordance with all current occupational and workplace health and safety legislation, regulations, codes of practice or manufacturers guidelines. Bio-Retention Basin Operational Management and Maintenance Guideline
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Page 7 For maintenance access the shallow nature of the bio-retention systems enables pedestrian ingress. As noted above no mechanical equipment is required unless resetting is required. The batter grades are considered to be acceptable and do not pose an occupational health and safety issue given proper training to maintenance personnel. The application of pesticides or herbicides in response to any weed outbreak, which cannot be controlled via manual removal, is to be undertaken by maintenance personnel in accordance with manufacturer’s guidelines in consultation with the Landscape Architect. Protective measures are to be implemented so as to minimise exposure to personnel, with personal protective measures to be the final hierarchical option. 5.8 Public Safety While maintenance is being undertaken consideration of pedestrians and cyclists is to be made due to the close proximity of the footpaths. To avoid any safety concerns it is recommended that temporary warning signs be placed at a sufficient distance to allow pedestrians and cyclists to become aware of possible maintenance vehicles/personnel when maintenance is being undertaken. 5.9 Disposal Requirements The removal of litter and debris, plants, dead or diseased vegetation or weeds are to be disposed offsite at an appropriate waste management facility. 5.10 Access Issues Suitable access to the bio-retention basins can be achieved directly from the internal road network within the site. 5.11 Bio-Retention Basin Resetting Resetting (i.e. complete reconstruction) of the bio-retention basins will be required if the system fails to drain adequately after tilling of the surface. Replacement of the filter media is required when it becomes 50% blocked, which is estimated to occur approximately every 8 to 10 years. This can be assessed via a review of sediment build up and the time necessary for the system to drain or by in-situ falling head permeability tests of the filter media. Bio-Retention Basin Operational Management and Maintenance Guideline
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Appendix A
BIO-RETENTION BASIN MAINTENANCE CHECKLIST
Bio-Retention Basin Operational Management and Maintenance Guideline
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APPENDIX L
NSC FLOOD HAZARD OVERLAY MAP
Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy
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Noosa Shire Council does not warrant the accuracy of information in this publication and any person using or relying 20/09/2023
upon such information does so on the basis that Noosa Shire Council shall bear no responsibility or liability
whatsoever for any errors, faults, defects or omissions in the information.
1:1129
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a G STRATEGIC STRATEGIC SOLUTIONS, CREATIVE THINKING rgstrategic.com.au