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RFI - Att 4 - Stwtr Mngmt Plan
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ingeniir STORMWATER MANAGEMENT PLAN 221304-SMP-01 Proposed Duplex 23 Coral Tree Avenue Noosa Heads 4567 Lot 17 on RP90014 Ingeniir Pty Ltd AUGUST 22 Authored by: Daniel Kenna for and on behalf of Ingeniir Pty Ltd. Ingeniir Pty Ltd | 221304-SMP-01 ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187 Page 1 | 13
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DOCUMENT INFORMATION
Document Reference Date Author Reviewed Review Date
221304-SMP-01 19/05/2022 Daniel Kenna Daniel Kenna 24/05/2022
221304-SMP-01 26/08/2022 Daniel Kenna Daniel Kenna 26/08/2022
© Ingeniir Pty Ltd (2022) All Rights Reserved. Copyright in the whole and every part of this document belongs
to Ingeniir Pty Ltd and may not be used, sold, transferred, copied or reproduced in whole or in part in any
manner or form or in or on any media to any person without the prior written consent of Ingeniir Pty Ltd.
DOCUMENT DETAILS & CERTIFICATION
Report Title Stormwater Management Plan
Document Reference 221304-SMP-01
Street Address 23 Coral Tree Avenue, Noosa Heads
Legal Description Lot 17 on RP90014
Prepared for Kumar Mahadevan
Revision 01
Date 19/05/2022
Prepared By Daniel Kenna
For and on behalf of Ingeniir Pty Ltd
Certified By Daniel Kenna
Qualifications RPEQ 15522
For and on behalf of Ingeniir Pty Ltd
Signed
Date 26/08/2022
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 2 | 13
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EXECUTIVE SUMMARY
Ingeniir Pty Ltd (Ingeniir) have been engaged by Kumar Mahadevan to produce this Stormwater Management
Plan (SMP) in support of the Material Change of Use application for the Proposed Duplex at 23 Coral Tree
Avenue Noosa Heads 4567, Lot 17 on RP90014.
This report is comprised of stormwater quantity and quality assessments. The quantity assessment is
undertaken to confirm a ‘non-worsening’ discharge of peak flow from the developed site. The quality
assessment is undertaken to determine the required stormwater treatment measures to be implemented on
site to comply with Local and State Authority requirements.
Stormwater Quantity Calculations consider storm events up to and including the 1% AEP storm event. The
purpose is to ensure that the existing infrastructure and/or downstream properties are not adversely
affected by the proposed development.
The stormwater quantity assessment determined that a negligible increase estimated runoff rates will occur
due to the proposed development and the site will maintain kerb discharges in accordance with IPWEAQ
standards.
Currently no quality stormwater management measures are in place for the existing subject site. As the
proposed development area is less than 2500m2; there are no required operable stormwater quality
objectives required by State and Local Stormwater Quality Objectives. A minimum 3,000 litres of rain water
storage is to provided per dwelling and reused for non-potable purposes to satisfy Council sustainability
outcomes.
All relevant standards and guidelines are addressed in this Stormwater Management Plan including;
criteria from the Noosa Shire Council Planning Scheme Policy, Queensland Urban Stormwater Quality
Planning Guidelines (2010), Queensland Urban Drainage Manual (QUDM) and the Australian Rainfall and
Runoff Guidelines.
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 3 | 13
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1. INTRODUCTION
Ingeniir Pty Ltd (Ingeniir) have been engaged by Kumar Mahadevan to produce this Stormwater Management
Plan in relation to the Proposed Duplex Development at 23 Coral Tree Avenue Noosa Heads 4567, Lot 17 on
RP90014.
There are no current approvals over the existing site.
2. EXISTING SITE CONDITIONS
The site is legally described as Lot 17 on RP90014, with an allotment area of 607m2. The site is located within
the Noosa Shire Council local government area.
Plate 1: Site Locality (Site highlighted Green)
The site currently has an existing residential dwelling and driveway on site. The site elevation ranges from
21.7m in the rear (West) to 19.06m at the front (East) of the allotment. Currently the roof-water discharges to
the kerb and overland flow discharges across the eastern and northern boundaries.
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 4 | 13
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The site currently receives surface water runoff from the majority of 28 Banksia Street to the East.
The lawful point of discharge for the site is the Coral Tree Avenue Road Reserve.
3. DESIGN OBJECTIVES
The objective of this report is to demonstrate that the project can comply with the Noosa Shire Council’s
codes and policies in relation to stormwater management through the implementation of the following
objectives;
• Maintain stormwater quality in accordance with local and state policies
• Manage and Mitigate quantities of peak stormwater discharge
• Adopt Water Sensitive Urban Design (WSUD) principles throughout
• Stormwater Harvesting and re-use for landscaping and alternative uses
• Provide immunity and resilience from flooding
This report outlines the design requirements to achieve the above objectives in a site-specific context.
4. STORMWATER STRATEGY
The site is situated between Coral Tree Avenue on the East and Banksia Avenue on the West. There is
stormwater infrastructure in Coral Tree Avenue/Jan Street approximately 20m North of the site as shown in
Plate 2; however the existing infrastructure is deemed unsuitable for direct connection for the following
reasons.
• The existing sewer line exiting the Northern side of the site is at a level where the stormwater would
clash or require site connection at an acute angle further limited by the power pole and existing
NBN/Telstra pit behind it.
• The site discharge for piped flows (5%AEP) is 38L/s which is generally considered below the threshold
to require direct network connection and would be considered a typical discharge rate for a
residential allotment.
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 5 | 13
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Plate 2: Infrastructure North of Site (Site highlighted Green)
It is achievable to maintain acceptable flows to Coral Tree Avenue from the site in accordance with IPWEAQ
standard drawing RS-081. It is noted that RS-081 applies to roof-water connections which implies that a 5%
AEP is the design event for the 25L/s per discharge location as per note 4.
The developed site in a 1% AEP event is expected to discharge a maximum of 55L/s (a pre-development
increase of 2L/s), and 38L/s in a 5% AEP with 2 proposed discharge points and will therefore comply with the
requirements of RS-081 without the need for on-site mitigation. Refer Appendix 2 | Rational Method
Calculations for pre and post development rational method calculations for the site.
5. STORMWATER QUALITY
5.1 Construction Phase
The State Planning Policy (DILGP, 2017) Appendix 2 – Stormwater management design objectives
Table A: Construction phase – stormwater management design objectives outlines construction phase
requirements for stormwater quality.
The following manuals (as a minimum) should be read and implemented by any contractor proceeding with
the development construction;
• State Planning Policy Appendix 2 Table A – available here
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 6 | 13
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• IECA Principles of Construction Site ESC – available here
• Water by Design ESC Factsheet Suite – available here
Detailed Erosion and Sediment Control design and plans should be documented by a suitably experienced
professional in conjunction with any application, or prior to commencing with the Building Works associated
with the proposed development on site.
5.2 Operational Phase
The site has a lot area of 607 and as such does not trigger local or state requirements for operational
treatment objectives for stormwater quality.
With reference to Acceptable outcome AO2.1 of the Sustainable Building Design Code - a minimum 3,000
litres of rain water storage is to provided per dwelling and reused for non-potable purposes, an example
product is shown in Appendix 3 | Duraplas Lattice Tank Details.
6. STORMWATER QUANTITY
The Bureau of Meteorology 2016 IFD service has been used for all analysis in this report.
A Rational Method estimation of the stormwater discharge has been used to estimate the pre-developed and
developed runoff performance of the site.
RATIONAL METHOD SITE DISCHARGE SUMMARY
Pre-Development Post-Development
AEP Duration Duration Performance
Q (m3/s) Q (m3/s)
(min) (min)
63.20% 0.013 5 0.014 5 7.7%
39.35% 0.018 5 0.019 5 5.6%
18.14% 0.025 5 0.026 5 4.0%
10% 0.03 5 0.031 5 3.3%
5% 0.036 5 0.038 5 5.6%
2% 0.046 5 0.048 5 4.3%
1% 0.053 5 0.055 5 3.8%
Table 1: Comparison of pre and post development site discharges to Coral Tree Avenue
As demonstrated in Table 1, the proposed development does not produce a material worsening of flows and
is discharging to a controlled discharge point being Coral Tree Avenue so is deemed unable to cause a
downstream nuisance as the peak increase in discharge is a maximum of only 2L/s. It is considered that the
redirection of existing flows exiting the Northern boundary of the site directly to Coral Tree Avenue is a
beneficial outcome.
The site is also noted as receiving some flows from 28 Banksia Avenue to the West. The proposed
development is designed to convey these flows around the proposed building by providing a cut-off drain
behind the Western retaining wall that directs flows to the driveway to discharge through to Coral Tree
Avenue in a sheet flow manner.
Currently there is no discernable drainage path for the flows from 28 Banksia Avenue, so the provision of a
drainage path for these flows is considered an improvement to the current scenario. Appendix 2 | Rational
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 7 | 13
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Method Calculations provides estimates of the current and developed flows for both the development site
(23 Coral Tree Avenue) and the neighbouring site (28 Banksia Avenue), although the flows rates presented
are considered conservative as the soils in this area are known to have infiltration rates of 125mm/hour or
better.
In accordance with IPWEAQ standard drawing RS-081 the site achieves 25L/s per discharge point for a 5% AEP
noting that RS-081 is for roof water kerb adapters and typical eaves gutters having a design capacity for the
5% AEP event.
Site discharge rates are only expected to have a minor increase on the existing site discharge rates and
provide an improved drainage connection to the formal infrastructure being Coral Tree Avenue as the site
currently does not have any formalised discharge to the street.
The site has negligible increase in flows of only 2L/s in 1% AEP flows to the kerb so is not considered capable
producing a worsening of flows as there is minimal change to the existing catchment characteristics.
7. FLOODING
The site is in an elevated position locally and regionally and is not known to have any flood risk. A review of
the Noosa Shire Council’s Intramaps (accessed 19/05/2022) indicates that the site is not affected by any
known flood or storm tide studies. Refer Plate 3 for an excerpt of the Council mapping.
Plate 3: Noosa Shire Council Flood Hazard Area/Defined Flood Extent in the vicinity of the site (Site highlighted)
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 8 | 13
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8. CONCLUSION
The proposed development has been analysed to provide design requirements to meet local and state
authority guidelines for stormwater quality and quantity outcomes.
A minimum 3,000 litres of rain water storage is to provided per dwelling and reused for non-potable purposes
to satisfy Council sustainability outcomes.
The proposed development can achieve the required design outcomes of the IPWEAQ by limiting site
discharge to Coral Tree Avenue to less than 50L/s during a 5% AEP Event and effectively maintaining site
stormwater discharge rates for all events up to and including the 1% AEP.
If you wish to discuss this report and analysis further, please contact Daniel Kenna.
Yours sincerely,
Daniel Kenna
Beng CPEng MIEAust RPEQ 15522 NER 3133685 EC 66121
for and on behalf of Ingeniir Pty Ltd
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 9 | 13
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9. LIMITATIONS
This report has been written based on Ingeniir’s understanding of the required scope at the time of writing;
and is written for the purposes of Kumar Mahadevan and not to be used for any other purpose.
To the extent permitted by law, Ingeniir expressly disclaims and excludes liability for any loss, damage, cost or
expenses suffered by any third party relating to or resulting from the use of, or reliance on, any information
contained in this report. Ingeniir does not admit that any action, liability or claim exist or be available to any
third-party, and disclaims any liability resulting from the inaccuracy of third-party information supplied to
Ingeniir for use in this report.
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 10 | 13
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Appendix 1 | BoM IFD Data
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 11 | 13
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Copyright Commonwealth of Australia 2016 Bureau of Meteorology (ABN 92 637 533 532)
All Design Rainfall Depth (mm)
Issued: 18-May-22
Location Label:
Requested coordinate:
Latitude -26.39523 Longitude 153.0877
Nearest gridLatitude
cell: 26.3875 (S) Longitude 153.0875 (E)
ExceedancesAnnual
per Year
Exceedance
(EY) Probability (AEP)
Duration Duration in min 12EY 6EY 4EY 3EY 2EY 63.20% 50% 0.5EY 20% 0.2EY 10% 5% 2% 1% 1 in 200 1 in 500 1 in 1000 1 in 2000
1 min 1 1.35 1.53 1.83 2.04 2.34 2.86 3.24 3.59 4.37 4.46 5.12 5.82 6.73 7.4 8.25 9.57 10.6 11.7
2 min 2 2.35 2.63 3.11 3.46 3.97 4.87 5.53 6.13 7.62 7.77 9.05 10.5 12.4 13.9 15.8 18.5 20.8 23.2
3 min 3 3.27 3.67 4.37 4.88 5.6 6.86 7.79 8.64 10.7 10.9 12.7 14.6 17.2 19.2 21.6 25.3 28.3 31.5
4 min 4 4.09 4.62 5.53 6.18 7.11 8.71 9.87 11 13.5 13.8 15.9 18.2 21.3 23.7 26.6 31 34.5 38.3
5 min 5 4.83 5.47 6.58 7.37 8.48 10.4 11.8 13.1 16 16.3 18.8 21.5 25 27.6 30.9 35.9 39.9 44.2
10 min 10 7.55 8.66 10.6 11.9 13.8 17 19.2 21.3 25.8 26.3 30.1 34.1 39.2 42.9 47.7 55.2 61.1 67.3
15 min 15 9.36 10.8 13.3 15 17.5 21.6 24.4 27.1 32.8 33.4 38.2 43.3 49.7 54.4 60.5 69.9 77.4 85.2
20 min 20 10.7 12.4 15.3 17.3 20.2 25.2 28.4 31.5 38.2 39 44.6 50.6 58.2 63.8 71 82.2 91.1 100
25 min 25 11.8 13.6 16.9 19.2 22.4 28.1 31.7 35.2 42.7 43.6 49.9 56.7 65.4 71.9 80.2 93 103 114
30 min 30 12.6 14.6 18.2 20.7 24.3 30.5 34.5 38.3 46.6 47.5 54.5 62.1 71.9 79.1 88.4 103 114 126
45 min 45 14.6 16.9 21.1 24.1 28.5 36.2 41 45.5 55.9 57 65.9 75.4 88 97.5 109 127 141 156
1 hour 60 16 18.6 23.3 26.7 31.6 40.6 46.1 51.1 63.3 64.5 74.9 86.2 101 113 126 147 163 181
1.5 hour 90 18.1 21.1 26.5 30.5 36.4 47.3 53.9 59.9 75 76.5 89.4 104 123 137 154 179 199 220
2 hour 120 19.7 23 29 33.5 40.2 52.6 60.2 66.9 84.5 86.1 101 118 140 158 177 205 228 252
3 hour 180 22.3 26 33 38.3 46.2 61.2 70.4 78.2 100 102 121 141 170 192 214 248 275 303
4.5 hour 270 25.3 29.6 37.7 43.9 53.4 71.5 82.6 91.7 119 121 144 170 205 233 258 298 330 363
6 hour 360 27.8 32.6 41.7 48.7 59.3 79.9 92.7 103 134 137 164 194 234 267 295 340 376 412
9 hour 540 31.9 37.6 48.2 56.5 69.1 93.8 109 121 160 163 196 233 283 322 356 410 451 495
12 hour 720 35.4 41.8 53.7 62.9 77.1 105 123 136 181 184 222 264 322 368 407 468 516 565
18 hour 1080 41.1 48.5 62.4 73.3 89.9 123 144 160 213 218 263 315 385 442 490 566 625 687
24 hour 1440 45.7 54 69.4 81.4 100 137 160 178 239 243 296 354 436 501 559 648 719 793
30 hour 1800 49.6 58.4 75.2 88.1 108 148 173 193 259 264 321 386 477 550 626 735 823 917
36 hour 2160 52.8 62.2 80 93.8 115 157 184 205 276 281 343 413 512 592 682 807 909 1020
48 hour 2880 58 68.3 87.7 103 126 172 202 224 302 308 377 456 568 661 768 917 1040 1180
72 hour 4320 65 76.6 98.3 115 141 192 225 250 338 345 424 515 647 757 880 1060 1210 1370
96 hour 5760 69.1 81.6 105 123 151 206 241 268 362 369 454 553 698 819 950 1140 1310 1490
120 hour 7200 71.4 84.8 110 129 159 216 253 281 379 386 475 579 732 859 995 1200 1370 1560
144 hour 8640 72.5 86.7 113 133 164 225 262 291 392 400 492 599 755 886 1030 1230 1410 1600
168 hour 10080 72.8 87.8 116 137 169 232 270 300 403 411 505 614 771 901 1050 1260 1440 1630
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Appendix 2 | Rational Method Calculations
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 12 | 13
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Rational Method Calculations
Project 221304
Address 23 Coral Tree Avenue By DK
Pre - Development Post - Development
Catchment Details Catchment Details
Area 0.0607 ha Area 0.0607 ha
fi 0.43 fi 0.62
C10 0.78632619 C10 0.82355848
I10 74.9 mm/hr I10 74.9 mm/hr
Standard Inlet Time Standard Inlet Time
Time 5 mins Time 5 mins
Overland Sheet Flow (Friend's Eqn) Overland Sheet Flow (Friend's Eqn)
Length m Length m
Slope % Slope %
Surface 'n' Surface 'n'
Time 0 mins Time 0 mins
Pipe Flow Travel Time Pipe Flow Travel Time
Flow Distance m Flow Distance m
Fall of Channel m Fall of Channel m
Time mins Time mins
Kerb Flow Kerb Flow
Length m Length m
Slope % Slope %
Time 0.0 mins Time 0.0 mins
Channel Flow (Figure 4.8 QUDM, or Channel Flow (Figure 4.8 QUDM, or
Manning's Equation) Manning's Equation)
Flow Distance m Flow Distance m
Fall of Channel m Fall of Channel m
Time mins Time mins
Adopted Time of Adopted Time of
Concentration
5 mins Concentration
5 mins
Pre-Development Peak Discharges Post-Development Peak Discharges
Design Storm Frequency
Area (ha) Cy Iy (mm/h) Qy (m3/s) (AEP) Factor (Fy)
Area (ha) Cy Iy (mm/h) Qy (m3/s)
0.0607 0.62906096 125 0.013 63.20% 0.80 0.0607 0.65884679 125 0.014
0.0607 0.66837727 157 0.018 39.35% 0.85 0.0607 0.70002471 157 0.019
0.0607 0.74700988 196 0.025 18.14% 0.95 0.0607 0.78238056 196 0.026
0.0607 0.78632619 226 0.03 10% 1.00 0.0607 0.82355848 226 0.031
0.0607 0.8256425 258 0.036 5% 1.05 0.0607 0.86473641 258 0.038
0.0607 0.90427512 300 0.046 2% 1.15 0.0607 0.94709226 300 0.048
0.0607 0.94359143 331 0.053 1% 1.20 0.0607 0.98827018 331 0.055
Discharge Comparison
AEP 63.20% 39.35% 18.14% 10% 5% 2% 1%
Difference 0.001 0.001 0.001 0.001 0.002 0.002 0.002
Percentage 7.7% 5.6% 4.0% 3.3% 5.6% 4.3% 3.8%
Page 15
Rational Method Calculations
Project 221304
Address 28 Banksia Avenue By DK
Pre - Development Post - Development
Catchment Details Catchment Details
Area 0.0647 ha Area 0.0647 ha
fi 0.00 fi 0.75
C10 0.7 C10 0.85
I10 74.9 mm/hr I10 74.9 mm/hr
Standard Inlet Time Standard Inlet Time
Time 5 mins Time 5 mins
Overland Sheet Flow (Friend's Eqn) Overland Sheet Flow (Friend's Eqn)
Length m Length m
Slope % Slope %
Surface 'n' Surface 'n'
Time 0 mins Time 0 mins
Pipe Flow Travel Time Pipe Flow Travel Time
Flow Distance m Flow Distance m
Fall of Channel m Fall of Channel m
Time mins Time mins
Kerb Flow Kerb Flow
Length m Length m
Slope % Slope %
Time 0.0 mins Time 0.0 mins
Channel Flow (Figure 4.8 QUDM, or Channel Flow (Figure 4.8 QUDM, or
Manning's Equation) Manning's Equation)
Flow Distance m Flow Distance m
Fall of Channel m Fall of Channel m
Time mins Time mins
Adopted Time of Adopted Time of
Concentration
5 mins Concentration
5 mins
Pre-Development Peak Discharges Post-Development Peak Discharges
Design Storm Frequency
Area (ha) Cy Iy (mm/h) Qy (m3/s) (AEP) Factor (Fy)
Area (ha) Cy Iy (mm/h) Qy (m3/s)
0.0647 0.56 125 0.013 63.20% 0.80 0.0647 0.68 125 0.015
0.0647 0.595 157 0.017 39.35% 0.85 0.0647 0.7225 157 0.02
0.0647 0.665 196 0.023 18.14% 0.95 0.0647 0.8075 196 0.028
0.0647 0.7 226 0.028 10% 1.00 0.0647 0.85 226 0.034
0.0647 0.735 258 0.034 5% 1.05 0.0647 0.8925 258 0.041
0.0647 0.805 300 0.043 2% 1.15 0.0647 0.9775 300 0.053
0.0647 0.84 331 0.05 1% 1.20 0.0647 1 331 0.06
Discharge Comparison
AEP 63.20% 39.35% 18.14% 10% 5% 2% 1%
Difference 0.002 0.003 0.005 0.006 0.007 0.01 0.01
Percentage 15.4% 17.6% 21.7% 21.4% 20.6% 23.3% 20.0%
Page 16
ingeniir
Appendix 3 | Duraplas Lattice Tank Details
Ingeniir Pty Ltd | 221304-SMP-01
ABN: 99 642 485 363 | PO Box 988 Maroochydore QLD 4558 | [email protected] | 0404157187
Page 13 | 13
Page 17
*
*
*
Do not scale drawing. Use written dimensions only
Issue Date Amendment App'd
ARDILL PAYNE
& PARTNERS
79 Tamar Street
P.O. Box 20 Telephone: 02 6686 3280
BALLINA NSW 2478 Facsimile: 02 6686 7920
A.B.N. 113 861 522 12 e-mail: [email protected]
Client:
* Project:
Title:
Scale Datum
Design Date
Drawn Dwg Filename
Checked Approved
Job No. Dwg No. Issue