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Site Based Stormwater Management Plan
Original PDF page 37, section 1. The text section number identifies this passage in the reader.
Plans and drawings
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Log in to see the plans as drawn Rational Method Calculations
Job Number 2123 IFD NOOSA NEW IFD
Address Lot 1 Taylor Court, Cooroy By VV
Pre- Development Scenario Post- Development Scenario
Ref 1 Catchment Details Catchment Details
Area 0.5677 ha Area 0.5677 ha
fi 0.00 fi 0.95
C10 0.7 C10 0.89
I10 74.2 mm/hr I10 74.2 mm/hr
Ref 2 Standard Inlet Time
Time 8 mins
Ref 3 Overland Sheet Flow (Friend's Eqn)
Length 83 m
Slope 5.4 %
Surface 'n' poor grass 0.035
Time 12 mins
Time of Time of
12 mins 8 mins
Concentration Concentration
Peak Discharge Calculations
Pre-Developed Peak Discharges Post-Developed Peak Discharges
Design
Frequency
Storm Area (ha) Cy Iy (mm/h) Qy (m3/s) Area (ha) Cy Iy (mm/h) Qy (m3/s)
Factor (Fy)
(AEP)
63% 1 0.5677 0.80 0.56 101 0.089 0.5677 0.71 111 0.125
39% 2 0.5677 0.85 0.60 122 0.114 0.5677 0.76 134 0.160
18% 5 0.5677 0.95 0.67 151 0.158 0.5677 0.85 167 0.223
10% 10 0.5677 1.00 0.70 179 0.198 0.5677 0.89 199 0.279
5% 20 0.5677 1.05 0.74 204 0.236 0.5677 0.93 226 0.333
2% 50 0.5677 1.15 0.81 237 0.301 0.5677 1.00 262 0.413
1% 100 0.5677 1.20 0.84 261 0.346 0.5677 1.00 289 0.456
Ref 5 Advice on Selection of AEP design events for various scenarios
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