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Attachment 6 - Stormwater Management Plan and Engineering Response. · MCU23/0078
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20/11/2023 + JOB No:-
INITIAL PEAK FLOW ESTIMATE
Written by BB 31/10/08
Updated by DJK 25/05/20
Job Number: 22159
Job Name: LOT 3 - Noosa Civic Village Expansion
Designed: VN
Checked: SG IFD Location: Noosaville
TOTAL RUNOFF COEFF. EXISTING TIME OF CONCENTRATION DEVELOPED TIME OF CONCENTRATION
Sub Catchment Area (Ha) Fraction Impervious Runoff Coeficients Calculated C10 Std Inlet Time 0 Std Inlet Time 5
No. Existing Proposed Existing Proposed Existing Proposed Existing Proposed
SHEET FLOW
SHEET FLOW
1 2.979 2.979 0% 93% 0.60 0.89 Site Slope (%) 2 Site Slope (%) 0
2 0.000 0.000 0% 0% 0.00 0.00 Flow Length (m) 200 Flow Length (m) 0
3 0.000 0.000 0% 0% 0.00 0.00 Horton's "n" 0.16 Horton's "n" 0
4 0.000 0.000 0% 0% 0.00 0.00 Travel Time (min) 87.16 Travel Time (min) 0.00
5 0.000 0.000 0% 0% 0.00 0.00
2.979 2.979 0.60 0.89 Travel Length (m) 0 Travel Length (m) 200
CHANNEL/PI
CHANNEL/PI
PE FLOW
PE FLOW
Raw IFD data has been obtained from the Bureau of Meteorology (BOM) website. Fall (m) 0 Fall (m) 5.6
Travel Time (min) 0 Travel Time (min) 2
Multiplier 0 Multiplier 1
s Travel Time (min) 0 Travel Time (min) 2
Total Time (Tc) 87.2 Total Time (Tc) 7.0
PEAK RUNOFF CALCULATIONS PEAK FLOWS FOR FREQUENT EVENTS
Rainfall Intensity (mm/hr) Coeficient of Runoff Peak Runoff Rates (m^3/s) ARI Event % of Q1 Peak discharge (m^/s)
AEP Event % ARI Event yr Existing Proposed Existing Proposed Existing Proposed yr Existing Proposed
63% 1 38 136 0.48 0.71 0.152 0.799 1mth 25% 0.038 0.200
39% 2 44 154 0.51 0.75 0.184 0.961 2mth 40% 0.061 0.320
18% 5 61 209 0.57 0.84 0.286 1.457 3mth 50% 0.076 0.399
10% 10 72 245 0.60 0.89 0.358 1.796 4mth 60% 0.091 0.479
5% 20 84 279 0.63 0.93 0.436 2.146 6mth 75% 0.114 0.599
2% 50 99 322 0.69 1.00 0.565 2.665 9mth 90% 0.136 0.719
1% 100 111 354 0.72 1.00 0.660 2.930 12mth 100% 0.152 0.799
^ 1
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