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Appendix D- Stormwater Management Plan · MCU23/0078
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24/04/2023 + JOB No:-
INITIAL PEAK FLOW ESTIMATE
Written by BB 31/10/08
Updated by DJK 25/05/20
Job Number: 22159
Job Name: SITE B Northern Site- 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 Std Inlet Time 5
No. Existing Proposed Existing Proposed Existing Proposed Existing Proposed
SHEET FLOW
SHEET FLOW
1 0.249 0.249 0% 100% 0.53 0.90 Site Slope (%) 1 Site Slope (%) 0
2 0.000 0.000 0% 0% 0.00 0.00 Flow Length (m) 100 Flow Length (m) 0
3 0.000 0.000 0% 0% 0.00 0.00 Horton's "n" 0.05 Horton's "n" 0
4 0.000 0.000 0% 0% 0.00 0.00 Travel Time (min) 24.83 Travel Time (min) 0.00
5 0.000 0.000 0% 0% 0.00 0.00
0.2488 0.2488 0.53 0.90 Travel Length (m) 0 Travel Length (m) 0
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) 0
Travel Time (min) 0 Travel Time (min) 0
Multiplier 0 Multiplier 0
Travel Time (min) 0 Travel Time (min) 0
Total Time (Tc) 24.8 Total Time (Tc) 5.0
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 67 124 0.42 0.72 0.020 0.062 1mth 25% 0.005 0.015
39% 2 75 140 0.45 0.77 0.023 0.074 2mth 40% 0.008 0.025
18% 5 102 191 0.50 0.86 0.035 0.113 3mth 50% 0.010 0.031
10% 10 119 225 0.53 0.90 0.044 0.140 4mth 60% 0.012 0.037
5% 20 136 257 0.56 0.95 0.052 0.168 6mth 75% 0.015 0.046
2% 50 157 299 0.61 1.00 0.066 0.207 9mth 90% 0.018 0.055
1% 100 172 331 0.64 1.00 0.076 0.229 12mth 100% 0.020 0.062
^ 1
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