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Attachment 3 - Stormwater Management Plan
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a = Ot a0 U2 6 Martin St 20220116 Permabuild Stormwater Management Plan September 2022
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Document control record
Document prepared by:
RECOR Pty Ltd
ABN 89 647 469 707
37 Mary Street
Noosaville, QLD 4566
Australia
T +61 7 5211 1003
E [email protected]
W recorconsulting.com
A person using RECOR documents or data accepts the risk of:
a) Using the documents or data in electronic form without requesting and checking them for accuracy against the original hard
copy version.
b) Using the documents or data for any purpose not agreed to in writing by RECOR.
Document control
Report title Stormwater Management Plan
Document code 20220116-SWMP01 Project number 20220116
File path C:\12dS\data\RecorSYN\20220116 U2 6 Martin St_529\03 Engineering\Report\RECOR
Preliminary Stormwater Management Report - 20220116.docx
Client Permabuild
Client contact - Client reference -
Rev Date Revision details/status Author Reviewer Verifier Approver
(if required)
0 27/09/2022 Initial Version BP BP
Current revision 1
Approval
Author signature Approver signature
Name B. Parry Name B. Parry
RPEQ: 28084
Title Civil Engineer Title Civil Engineer
recorconsulting.com
P +61 7 5211 1003 A 75 Noosa Drive, Noosa Heads, Qld 4567
E [email protected]
Page 3
Contents
Introduction..........................................................................................................................................4
Site Details ...........................................................................................................................................5
2.1. Existing Site Description & Drainage .................................................................................................. 5
2.2. Existing Drainage Patterns .................................................................................................................. 5
2.3. Proposed Development Drainage Pattern ......................................................................................... 6
2.4. Flood Considerations ........................................................................................................................... 6
Stormwater Quantity ............................................................................................................................7
3.1. Pre-Post Comparison .......................................................................................................................... 7
Stormwater Quality ..............................................................................................................................9
4.1. Construction Phase .............................................................................................................................. 9
4.2. Operational Phase ............................................................................................................................ 10
Conclusion ........................................................................................................................................ 11
Appendices
Appendix A
Proposed Development Plans
Appendix B
DRAINS Modelling Parameters and Results
Project number 20220116
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Page 4
INTRODUCTION RECOR has been engaged to prepare a Stormwater Management Report to accompany a development application for a residential duplex development located at U2 6 Martin Street, Peregian Beach. This report investigates the stormwater management considerations for the existing and proposed development site and assesses how the run-off from the site is to be managed in accordance with Noosa Shire Council requirements for stormwater drainage. Project number 20220116 File RECOR Preliminary Stormwater Management Report - 20220116.docx, 2022-09-27 Page 4 of 14 Revision 1 P +61 7 5211 1003 A 75 Noosa Drive, Noosa Heads, Qld 4567 E [email protected] recorconsulting.com
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SITE DETAILS
2.1. Existing Site Description & Drainage
The existing site, known in real property terms as Lot 2 SP 215946, is located at 6 Martin St on the corner of Martin
Street and Avocet Parade. The site shares a common property area (Lot 0 GTP345) containing driveway and
landscaping with adjacent Lot 1 SP 215946. Both lots contain an existing residential dwelling, with the site having a
total area of 882.8m². The site adjoins residential allotments to the east and north, and Avocet Parade and Martin
Street to the west and south of the site respectively.
2.2. Existing Drainage Patterns
The subject land is gently sloping, with typical grades of less than 5% falling north to south across the lot.
The run-off from the existing developed site typically drains as overland surface flows towards the road reserve to
the south. Due to the sandy soils present in the locality the run-off is likely to infiltrate as it discharges downstream
with only a portion of the run-off likely to reach the existing kerb and gutter to the south east of the subject site.
A grated trench drain across the driveway captures surface runoff from the pavement area, and an existing kerb
adaptor outlet was located at the southeast corner of the common property boundary which is expected to be the
outlet for the driveway and adjacent roof run-off. An existing drainage pit within the site is connected to roof run-off
from the existing dwelling, with the outlet pipe discharging towards Martin Street, however no outlet was observed.
Although contours indicate that upstream run-off from the adjacent site may enter across the property boundary,
the existing building present along the boundary of Lot 2 will divert the majority of runoff either west towards Avocet
Parade or to the east into an adjacent property. The upstream run-off is therefore expected to be minimal, and likely
to infiltrate into the site soils.
Figure 2.1 - Site Locality Plan (Noosa Council Intramaps, 2022)
Project number 20220116
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2.3. Proposed Development Drainage Pattern
2.3.1 Stormwater Concept
Stormwater run-off will be managed by an internal network of pits and pipes to collect upstream run-off, run-off from
impervious areas and roof drainage. The existing stormwater pit will be replaced and new piped outlets to discharge
into the Martin Street verge will be provided as the lawful point of discharge from the development.
The proposed development does not significantly alter existing run-off generation, and attenuation of the site is not
required. The majority of run-off generated by the development will be from roof area, which will be drained by
downpipes to discharge into the internal drainage network.
The remaining ground areas of the site will drain as overland surface flows infiltrating into the site soils consistent
with the current drainage conditions draining south towards the Martin Street road reserve.
The roof and allotment drainage system for the proposed site shall be designed to comply with:
1. Noosa Shire Council Planning Scheme Policy (PSP) - Engineering Design Standards – Roads, drainage and
earthworks;
2. The Queensland Urban Drainage Manual (QUDM); and
3. AS/NZS 3500.3:2015 - Plumbing and Drainage Part 3: Stormwater Drainage.
Refer to Appendix A Proposed Development Plan for the proposed stormwater drainage layout illustrating the
concept described above.
2.4. Flood Considerations
Review of the Noosa Shire Council Intramaps flood layers including the Flood Hazards Overlay has identified that
the site is located outside of any flood or inundation areas within the locality indicating it is not expected that that
the proposed development will be subject to flooding.
Project number 20220116
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STORMWATER QUANTITY
3.1. Pre-Post Comparison
The site has been modelled using the DRAINS software to assess the impact on peak flows, comparing the existing
site conditions to the proposed development.
In accordance with ARR2019, an Initial Loss-Continuing Loss (IL-CL) model has been used to assess the site against
the ensemble of storm temporal patterns for the East Coast North region. The loss parameters and temporal patterns
have been imported from the ARR Datahub, and rainfall intensities have been imported from the Bureau of
Meteorology IFD rainfall data allowing for a 20% increase to rainfall rates to account for future climate change
patterns.
The parameters obtained from the Australian Rainfall and Runoff (ARR) Data Hub for the location and the rainfall
IFD data obtained from the Bureau of Meteorology have been imported into DRAINS to generate the storm events.
The models have been run using the ensemble of storm events for 1EY, 50%, 0.2EY, 10%, 5%, 2% and 1% Annual
Exceedance Probability (AEP) for durations from 1 minutes to 24 hours to determine the critical storm duration and
the mean peak flowrate from the storms. Refer to Appendix B DRAINS Modelling Parameters and Results for details
of the parameters used and summary of the results from the modelling.
The configuration of the catchment areas for pre-development and post-development scenarios are shown in Figure
3.1 – DRAINS Pre-development catchment and Figure 3.2 – DRAINS Post-development catchments respectively.
Figure 3.1 – DRAINS Pre-development catchment
Project number 20220116
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Figure 3.2 – DRAINS Post-development catchments
The results of the modelling against the range of design storms for the development under the existing and
proposed development conditions are shown in Table 3.1 Existing and proposed unmitigated site peak discharge
rates.
Table 3.1 Existing and proposed unmitigated site peak discharge rates
Wyandra Street
Qchange
A.E.P Qexisting Qproposed Qchange (%)
(m³/s) (m³/s) (m³/s)
1EY 0.024 0.027 0.003 13%
50% 0.029 0.029 0.000 0%
0.2 EY 0.044 0.045 0.001 2%
10% 0.053 0.053 0.000 0%
5% 0.061 0.061 0.000 0%
2% 0.070 0.071 0.001 1%
1% 0.078 0.078 0.000 0%
The site has only resulting in minor increases to peak run-off for less than half of the modelled storm events. With the
increase being a maximum of 3L/s, the impact to downstream drainage conditions will be insignificant and unlikely
to result in damage or nuisance to downstream properties and infrastructure. Attenuation is therefore not required
for the proposed development.
Project number 20220116
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STORMWATER QUALITY
The following sections discuss the stormwater quality considerations for the construction and operational phase of
the development.
4.1. Construction Phase
4.1.1 Erosion and Sediment Control Measures
During construction, it is necessary to manage stormwater run-off to avoid potential contamination of downstream
waterways from sediments and other pollutants from the site. A range of best practice sediment and erosion controls
should be implemented on the development to ensure negative impacts to the downstream receiving environment
are mitigated.
As the area being developed is below 2,500m², the development’s construction will be managed using best practice
erosion and sediment control principles in line with the desired outcomes of Appendix 2 of the SPP (DERM, July
2017), which are shown below in Figure 4.1.
Figure 4.1 SPP 2017 Construction Phase Stormwater Management Design Objectives
A site-specific erosion and sediment control plan shall be prepared as part of a future submission for Operational
Works approval. Suitable erosion and sediment controls for the site may include:
1. Sediment fencing along downstream of the work areas within the site to prevent sediment from leaving the
construction area.
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2. A shakedown area is to be installed at the construction entry/exit to the proposed development area to
minimise sediment being transported to and from the site.
3. Downstream pits within the road reserve are to be protected through filter socks or similar.
4. Diversion of upstream catchments around any exposed areas using diversion drains around the site.
4.2. Operational Phase
The development consists of replacing the existing dwelling located on a parcel of a small lot duplex consistent.
The proposed development is not considered to significantly alter the pollutant generation potential of the site,
and therefore no additional stormwater quality treatment is proposed for the development.
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CONCLUSION
This Stormwater Management Report has outlined how the stormwater run-off from the site is to be managed to
comply with the relevant requirements and minimise any adverse impacts to the downstream catchments.
• The proposed site roof run-off, impervious areas and upstream run-off is captured and conveyed via an
internal drainage network, which discharges south into the Martin Street road reserve. Remaining areas of
the site will rely on infiltration into the typically sandy soils of the locality in a manner consistent with the
existing drainage conditions.
• The lawful point of discharge for the development will be via an outlet into the Martin Street road reserve, to
which the site currently drains.
• The existing and proposed development site have been modelled for the critical design storm events for the
site, which found that only minor peak flow increases would arise for a small number of storm events. The
overall increase is deemed to be insignificant and unlikely to result in significant impacts to downstream
properties and infrastructure therefore no attenuation is considered to be necessary.
• During construction, erosion and sediment control measures are to be implemented to minimise potential
contaminants impacting the downstream receiving environment in line with the objectives of Appendix 2 of
the SPP. An erosion and sediment control plan shall be developed as part of a submission for Operational
Works approvals.
• As the development is a small residential site that does not significantly alter the pollutant generating
characteristics of the site, stormwater quality treatment is not proposed for the development.
• The proposed stormwater solution is considered to minimise any adverse impacts to the downstream
environment arising from the stormwater run-off while also meeting the stormwater objectives for the
development.
Project number 20220116
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Appendix A Proposed Development Plans Project number 20220116 File RECOR Preliminary Stormwater Management Report - 20220116.docx, 2022-09-27 Page 12 of 14 Revision 1 P +61 7 5211 1003 A 75 Noosa Drive, Noosa Heads, Qld 4567 E [email protected] recorconsulting.com
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GENERAL NOTES
AVOCET
1. ALL DIMENSIONS SHOWN ARE IN METERS UNLESS OTHERWISE SHOWN.
2. EXISTING SERVICES HAVE BEEN PLOTTED FROM SUPPLIED DATA AND AS SUCH THEIR
ACCURACY CANNOT BE GUARANTEED. NO RESPONSIBILITY IS TAKEN BY RECOR FOR THE
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ACCURACY AND COMPLETENESS OF THIS INFORMATION.
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3. LOCATION AND LEVEL OF ALL EXISTING SERVICES IS TO BE CONFIRMED PRIOR THE
COMMENCEMENT OF ANY WORKS.
4. ON COMPLETION OF SERVICES INSTALLATION, ALL DISTURBED AREAS SHALL BE
PROVIDE NEW DRIVEWAY RESTORED TO ORIGINAL LEVEL, INCLUDING KERBS, FOOTPATHS, CONCRETE AREAS,
CROSSOVER GENERALLY IN GRAVEL AREAS, GRASSED AREAS AND ROAD PAVEMENTS.
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ACCORDANCE WITH NSC STD
DWG RS-049 & RS-050 5. ALL WORKS TO BE COMPLETED IN ACCORDANCE WITH ALL LOCAL AUTHORITY
APPROVALS RECEIVED FOR THE PROJECT AND IN ACCORDANCE WITH OPW APPROVALS
BY COUNCIL.
6. NO WORKS ARE TO BE UNDERTAKEN ON LAND OUTSIDE OF THE SITE BOUNDARY
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WITHOUT FORMAL APPROVAL BY THE OWNER/CUSTODIAN OF THAT LAND INCLUDING BUT
21.189m
20.000m
NOT LIMITED TO PRIVATE PROPERTY, ROAD RESERVE, PARKS/OPENSPACE, EASEMENTS.
15.000m
10.000m
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5.000m
0.000m
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REFER DWG 011 FOR
DRIVEWAY LONG SECTION AND
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VERTICAL CLEARANCE NOTE:
EXCEPT WHERE NOTED ON PLAN AND ASSOCIATED DESIGN DRAWINGS, ALL
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IN-GROUND SERVICES WITHIN THE PROPERTY BOUNDARY INCLUDING BUT NOT
LIMITED TO: STORMWATER DRAINAGE, SEWERAGE, WATER, GAS, ELECTRICAL
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AND COMMUNICATIONS TO BE SAFELY BE DISCONNECTED, REMOVED FROM
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SITE AND CAPPED OFF AT SITE BOUNDARY. CONTRACTOR TO ARRANGE ALL
NECESSARY APPLICATIONS AND PERMITS WITH THE RELEVANT AUTHORITIES.
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SERVICES TO BE CAPPED IN ACCORDANCE WITH RELEVANT SERVICE
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REFER TO
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EXTENT OF DRIVEWAY BATTER
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AT 1:6 GRADE. LOCALLY
ADJUST TO MATCH TO
EXISTING SEWER MANHOLE
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PROVIDE BARRIER KERB WW
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SECTION WITH KERB ADAPTOR
OUTLETS
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CLIENT DETAILS: PROJECT ADDRESS: APPROVED BY: PROJECT NAME:
PROPOSED RESIDENTIAL DEVELOPMENT
PERMABUILD TITLE: STATUS:
U 2 6 MARTIN STREET FOR APPROVAL - NOT FOR
© ABN 89 647 469 707
PEREGIAN BEACH, QLD 4573 BEN PARRY CONSTRUCTION
75 NOOSA DRIVE RPEQ: 28084
01 27/09/22 ISSUE FOR APPROVAL BRP BRP SCALE:
NOOSA HEADS, QLD 4567 CPEng DRAWING NUMBER: PROJECT NUMBER: SHEET REV:
+61 7 5211 1003 REV DATE DESCRIPTION DWN CHK APP
DATE: 27/09/2022 SIZE:
RECORCONSULTING.COM REVISIONS
DO NOT SCALE, IF IN DOUBT ASK
20220116
Page 14
AVOCET PDE CL
PROPERTY BDY
B99
VIP RL 8.811
VIP RL 8.787
VIP RL 8.761
VIP RL 8.56
VIP RL 8.75
VIP RL 8.6
VIP RL 8.3
STANDARDS 2004 (AU_NZ)
(c) 2022 Transoft Solutions, Inc. All rights reserved.
Ground Clearance (units: m)
Part # Front Wheelbase Rear
VERTICAL GEOMETRY GRADE (%) -2.3% -8.9% 12.5% 2.5% 5% -5% -7.7% 0%
#1 0.12 0.12 0.12
VERTICAL GEOMETRY LENGTH (m) 3.09 0.45 1.52 1.5 0.48 1 5.99 7.16
DATUM RL = 3.700
FINISHED SURFACE LEVEL
8.671
8.600
8.560
8.750
8.787
8.811
8.761
8.754
8.610
8.300
8.300
8.300
EXISTING SURFACE LEVEL
8.600
8.631
8.733
8.553
8.506
8.407
8.398
8.502
8.912
9.087
9.122
CUT / FILL DEPTH
-0.000
-0.071
-0.612
-0.787
-0.822
0.017
0.234
0.306
0.354
0.356
0.108
CONTROL LINE CHAINAGE
21.189
3.085
3.535
5.053
6.553
7.035
8.035
8.128
14.03
10
20
0
A1 SCALE: H 1:100, V 1:100 DRIVEWAY ACCESS
CLIENT DETAILS: PROJECT ADDRESS: APPROVED BY: PROJECT NAME:
PROPOSED RESIDENTIAL DEVELOPMENT
PERMABUILD TITLE: STATUS:
U 2 6 MARTIN STREET FOR APPROVAL - NOT FOR
© ABN 89 647 469 707
PEREGIAN BEACH, QLD 4573 BEN PARRY CONSTRUCTION
75 NOOSA DRIVE RPEQ: 28084
01 27/09/22 ISSUE FOR APPROVAL BRP BRP SCALE:
NOOSA HEADS, QLD 4567 CPEng DRAWING NUMBER: PROJECT NUMBER: SHEET REV:
+61 7 5211 1003 REV DATE DESCRIPTION DWN CHK APP
DATE: 27/09/2022 SIZE:
RECORCONSULTING.COM REVISIONS
DO NOT SCALE, IF IN DOUBT ASK
20220116
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DRAINAGE NOTES
300x300 GRATED INLET PIT
SL: 8.77m
IL: 8.45m
1. ROOF AND BUILDING DRAINAGE TO HYDRAULIC ENGINEERS SPECIFICATIONS..
2. ALL STORMWATER DRAINAGE PIPES INTERNAL TO SITE SHALL BE MINIMUM SN8
uPVC OR APPROVED EQUIVALENT.
Ø150mm PIPE 3. ALL STORMWATER GRATES/LIDS WITHIN TRAFFICABLE AREAS TO BE CLASS "D" IN
LENGTH: 7.6
W W GRADE: 6.2%
Ø150mm PIPE ACCORDANCE WITH AS3996.
LENGTH: 10.6
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W USIL: 8.45 GRADE: 1.0%
4. THE LOCATION AND DEPTH OF ALL SERVICE CONDUITS IN VERGE AND WITHIN THE
DSIL: 7.94 USIL: 8.05 300x300 GRATED INLET PIT SITE ARE TO BE IDENTIFIED PRIOR TO ANY WORKS COMMENCING.
DSIL: 7.94 SL: 8.30m 5. REMOVE ANY REDUNDANT DRAINAGE OUTLETS FROM THE KERB AND CHANNEL
IL: 8.05m INCLUDING ANY ASSOCIATED PIPEWORK ACROSS THE FOOTWAY AND REINSTATE
THE FOOTWAY AREA IN ACCORDANCE WITH COUNCIL GUIDELINES.
6. LOCAL SHAPING OF THE FINISHED SURFACE TO ENSURE NO LOCALISED
DEPRESSION OR AREAS OF PONDING. LEVELS TO GRADE TOWARDS INLET PITS.
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GRATED TRENCH DRAIN ACO
KLASSIKDRAIN 100 (OR EQUIVALENT)
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LEGEND
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300x300 GRATED INLET PIT NEW STORMWATER PIPE
SL: 8.30m
IL: 7.92m
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NEW STORMWATER PIT
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Ø150mm PIPE
LENGTH: 13.9 NEW TRENCH DRAIN
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GRADE: 1.0%
USIL: 7.92
DSIL: 7.79
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EXISTING SITE
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ARCHITECTURALS
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TO REMAIN
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FOR BUILDING
LAYOUT
450x450 GRATED INLET PIT
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SL: 8.30m
IL: 7.77m
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DEMOLISH EXISTING STORMWATER AND
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EXCAVATE AND REMOVE DRAINAGE.
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Ø150mm PIPE
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LENGTH: 6.0
GRADE: 3.0%
USIL: 7.77
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450x450 GRATED INLET PIT WW
SL: 7.96m WW
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IL: 7.59m WW
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2x100mm PIPE TO OUTLET WW
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LENGTH: 12.1 WW
GRADE: 0.5% WW
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USIL: 7.57 WW
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DSIL: 7.51 WW
PROVIDE DRIVEWAY WING AND BARRIER WW
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KERB SECTION WITH KERB ADAPTOR WW
OUTLETS WW
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CLIENT DETAILS: S APPROVED BY: PROJECT NAME:
PROJECT ADDRESS:
PROPOSED RESIDENTIAL DEVELOPMENT
PERMABUILD TITLE: STATUS:
U 2 6 MARTIN STREET STORMWATER DRAINAGE FOR APPROVAL - NOT FOR
© ABN 89 647 469 707
PEREGIAN BEACH, QLD 4573 BEN PARRY PLAN CONSTRUCTION
75 NOOSA DRIVE RPEQ: 28084
01 27/09/22 ISSUE FOR APPROVAL BRP BRP SCALE:
NOOSA HEADS, QLD 4567 CPEng
+61 7 5211 1003 REV DATE DESCRIPTION DWN CHK APP
AS INDICATED DATE: 27/09/2022
DRAWING NUMBER: PROJECT NUMBER: SHEET REV:
SIZE:
RECORCONSULTING.COM REVISIONS
DO NOT SCALE, IF IN DOUBT ASK
040 20220116 A1 01
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DEVELOPED CATCHMENT
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EXISTING CATCHMENT
SITE AREA : 882.8m² LEGEND
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SITE AREA : 882.8m²
IMPERVIOUS PAVING: 77.8m²
IMPERVIOUS PAVING: 52.5m²
IMPERVIOUS PAVING
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IMPERVIOUS DRIVEWAY: 92.3m²
IMPERVIOUS DRIVEWAY: 103.9m²
IMPERVIOUS ROOF: 432..m²
IMPERVIOUS ROOF: 336.0m²
PERVIOUS AREA: 280.4m² IMPERVIOUS DRIVEWAY
PERVIOUS AREA: 390.4m²
IMPERVIOUS FRACTION: 68.2%
IMPERVIOUS FRACTION: 55.8%
IMPERVIOUS ROOF
TIME OF CONCENTRATION: 5 minutes
TIME OF CONCENTRATION: 5 minutes
CLIENT DETAILS: PROJECT ADDRESS: APPROVED BY: PROJECT NAME:
PROPOSED RESIDENTIAL DEVELOPMENT
PERMABUILD TITLE: STATUS:
U 2 6 MARTIN STREET STORMWATER CATCHMENT FOR APPROVAL - NOT FOR
© ABN 89 647 469 707
PEREGIAN BEACH, QLD 4573 BEN PARRY PLAN CONSTRUCTION
75 NOOSA DRIVE RPEQ: 28084
01 27/09/22 ISSUE FOR APPROVAL BRP BRP SCALE:
NOOSA HEADS, QLD 4567 CPEng
+61 7 5211 1003 REV DATE DESCRIPTION DWN CHK APP
AS INDICATED DATE: 27/09/2022
DRAWING NUMBER: PROJECT NUMBER: SHEET REV:
SIZE:
RECORCONSULTING.COM REVISIONS
DO NOT SCALE, IF IN DOUBT ASK
041 20220116 A1 01
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Appendix B DRAINS Modelling Parameters and Results Project number 20220116 File RECOR Preliminary Stormwater Management Report - 20220116.docx, 2022-09-27 Page 13 of 14 Revision 1 P +61 7 5211 1003 A 75 Noosa Drive, Noosa Heads, Qld 4567 E [email protected] recorconsulting.com
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Site Catchment Areas for DRAINS Modelling
Project number: 20220116 Calculations: B. Parry
Street Address: 6 Martin St
Locality: Peregian Beach, NSC Date: 6/09/2022
Existing Site
Existing Site Directly connected (m²) Indirectly connected (m²)
6 Martin St Roof 336.0 336.0 -
Impervious Ground 52.5 - 52.5
Driveway 103.9 103.9 -
Total Imp 492.4 439.9 52.5
Total Per 390.4 - 390.4
Site Area 882.8 439.9 52.5
% impervious Effective DCIA = 75% DCIA ICIA +25% ineffective DCIA
329.9 162.5
Impervious 55.8% 37.4% 18.4%
Pervious 44.2%
Proposed Site
Proposed Directly connected (m²) Indirectly connected (m²)
6 Martin St Roof 432.3 432.3 -
Impervious Ground 77.8 - 77.8
Driveway 92.3 92.3
Total Imp 602.4 524.6 77.8
Total Per 280.4 - 280.4
Site Area 882.8 524.6 358.2
% impervious Effective DCIA = 75% DCIA ICIA +25% ineffective DCIA
393.5 209.0
Impervious 68.2% 44.6% 23.7%
Pervious 31.8%
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BOM IFDs Frequent and Infrequent Storm Events REC2« Project number: 20220116 R Street Address: 6 Martin St Locality: Peregian Beach, NSC Date: 6/09/2022 Source Tittpy/mwwbom.gov.aul water/designRainfalls|revised-fdl Location Latitude -26,46809522 a “AEP - Annual Exceedance Probability Nearest Latitude 26.4625 (S) 2000, SEY Brcsedance per ear Longitude 153.0978609 Nearest Longitude 153.0875 (E) 2000 |- tegend as00 | ——» 1 Date obtained 6/09/2022 1000 70 ‘Annual Exceedance Probability (AEP) Duration 3.20% 506k 20%" 10% 5% 2% 1% Lmin 173 195 263 308 351 406 447 2 min 7] 166 229 272 315 374 421 3 min 138 156 214 254 293 346 387 4 min BI 149 203 239 215 322 358 5 min 125 12 193 227 259 302 334 10 min 102 116 155; 181 206 237 259 15 min 86.9 98 BI 153 174 200 219 20min 75.9 85.6 115 134 152 175 192 25 min 61.7 76.3 103 120 137 158 173 30 min 613 69.2 933 109 125 144 159 45 min 285 548 746 87.9 101 118 130 Lhour 40.7 46.2 63.3 749 86.3 101 113 15 hour 316 36 50 59.6 69.1 819 319] 2 hour 26.4 30.1 a2] 50.6 59 70.3 79.2 3 hour 20.4 23.5 33.3 40.3 a2 56.7 64.1 4.5 hour 159 18.4 26.4 32.1 37.8 45.6 518 (éhour 133 155 22.4 274 32.3 39.1 445 2b 9 hour 10.4 12.2 178 218 25.9 315 35.9 12 hour 8.78 10.3 15.1 186 22.1 26.9 30.8 os | 18 hour 6.86 8.04 119 147 176 215 247 24 hour 5.13 6.12 10 12.4 149 18.3 2 30 hour 4.36] 5.83 37] 108 B 16 18.4 og Fy 36 hour 44 5.16 712 9.61] 116 143 16.6 48 hour 3.62 424 6.36 7.93 9.58 7.9 Bg Thinutes Tours Loa 72 hour 217] 3.16 4.74] 5.94 721 9.07 10.6 96 hour 217 254 3.81 4.78 5.81 734 8.62 Duration 120 hour 1.82 213 3.19 4 4.88 6.16 7.24 144 hour 158 isd 2.75 a 42 53 6.22 ©Copyright Commonwealth of Australia 2016, Bureau of Meteorology (ABN 92 637 533 532) 168 hour 1:39 1.63 2.43 3.04 3.69 4.64 5.43
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ARR Datahub Parameters Project number: 20220116 Street Address: 6 Martin St Locality: Peregian Beach, NSC Date: 6/09/2022
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min (h)\AEP(*%) 60 (1.0) 90 (1.5) 120 (2.0) 180 (3.0) 360 (6.0) 720 (12.0) 1080 (18.0) 1440 (24.0) 2160 (36.0) 2880 (48.0) 4320 (72.0) 50 34 (0.073) 76 (0.140) 19.1 (0.316) 219 (0.311) 216 (0.232) 20.4 (0.166) 13.3 (0.092) 39 (0.024) 24 (0.012) 0.0 (0.000) 0.0 (0.000) Interim Climate Change Factors RCP 4.5 2030 0.869 (4.3%) 2040 1.057 (5.3%) 2050 1.272 (6.4%) 2060 1.488 (7.5%) 2070 1.676 (8.5%) 2080 1.810 (9.2%) 2090 1.862 (9.5%) 20 10 68 941 (0.108) (0.122) 18 14.7 (0.158) (0.164) 21.5 23.4 (0.255) (0.228) 25.4 278 (0.254) (0.230) 474 64.4 (0.352) (0.393) 412 54.9 (0.227) (0.246) 377 53.9 (0.176) (0.203) 22.4 34.2 (0.092) (0.118) 16.5 26.0 (0.059) (0.075) 92 15.3 (0.030) (0.040) 37 62 (0.011) (0.015) RCP6 0.783 (3.9%) 1.014 (5.1%) 1.236 (6.2%) 1.458 (7.4%) 1.691 (8.6%) 1.944 (9.9%) 2.227 (11.5%) 1.3 (0.131) 174 (0.168) 24.7 (0.209) 30.0 (0.212) 80.8 (0.416) 68.1 (0.287) 694 (0.219) 45.9 (0.129) 35.2 (0.084) 212 (0.046) 8.6 (0.017) 2 13.2 (0.130) 193 (0.157) 23.2 (0.165) 73.5 (0.433) 114.0 (0.485) 99.1 (0.307) 102.0 (0.263) 96.4 (0.218) 65.6 (0.127) 48.8 (0.085) 13.7 (0.021) RCP 8.5 0.983 (4.9%) 1.349 (6.8%) 1.773 (9.0%) 1 14.6 (0.129) 207 (0.150) 22.0 (0.139) 106.2 (0.552) 138.8 (0.519) 122.3 (0.331) 126.5 (0.285) 132.6 (0.263) 88.3 (0.148) 69.5 (0.104) 17.6 (0.023) 2.237 (11.5%) 2.722 (14.2%) 3.209 (16.9%) 3.679 (19.7%) time up September cuze 1u:zrAM Accessed Version 2018_v1 Note Preburst interpolation methods for catchment wide preburst has been slightly altered. Point values remain unchanged Layer Info Time Accessed Version Note 06 September 2022 10:27AM 2019 v1 ARR recommends the use of RCP4.5 and RCP 8.5 values. These have been updated to the values that can be found on the climate change in Australia website.
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DRAINS Modelling Results
Project number: 20220116 Calculations: B. Parry
Street Address: 6 Martin St
Locality: Peregian Beach, NSC Date: 6/09/2022
Pre / Post Comparison
A.E.P Qy Pre (m3/s) Qy Post (m3/s) Qchange (m3/s) Qchange (%)
1 EY 0.024 0.027 0.003 13%
50% AEP 0.029 0.029 0.000 0%
0.2 EY 0.044 0.045 0.001 2%
10% AEP 0.053 0.053 0.000 0%
5% AEP 0.061 0.061 0.000 0%
2% AEP 0.070 0.071 0.001 1%
1% AEP 0.078 0.078 0.000 0%
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Document prepared by RECOR Pty Ltd ABN 89 647 469 707 37 Mary Street Noosaville, QLD 4566 Australia T +61 7 5211 1003 E [email protected] W recorconsulting.com Project number 20220116 File RECOR Preliminary Stormwater Management Report - 20220116.docx, 2022-09-27 Page 14 of 14 Revision 1 P +61 7 5211 1003 A 75 Noosa Drive, Noosa Heads, Qld 4567 E [email protected] recorconsulting.com