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Att 1 - RFI Amended SWMP
Rational Method Peak Flow Calculations Job No: 23098 MORGAN CONSULTING Job Type: Proposed Townhouse Development ENGINEERS PTY LTD Address: 5 Pearl Street, Cooroy 1 GREAT GEORGE STREET Council: NSC PADDINGTON QLD 4064 IFD Data: 26.4125 (S),152.9125 (E) Minor Storm: Q10 Designed: RC 1 I10 70mm/hr Major Storm: Q100 Checked: HM Pre Development Post Development Time of Concentration Standard Inlet Time Standard Inlet Time Standard Inlet Time mins Standard Inlet Time 5 mins Sheet Flow (Friends Equation) Sheet flow length (L) 64 m Pipe Flow roughness (n) 0.03 short grass Flow distance 68.26 m Pipe Fall of NSL 2.21 m Fall of channel m Slope of Surface (S) 3.5 % Flow Velocity 2.5 m/s total 10.0 mins total 0.5 mins Concentrated Overland Flow Concentrated Overland Flow Flow distance 0 m Flow distance m velocity 0.7 m/s velocity 0.7 m/s mins 0.0 mins mins 0.0 mins Surface type multiplier 3.0 Surface type multiplier 4.0 total 0.0 mins total 0.0 mins Total tc 10.0 mins Total tc 5.5 mins Runoff Volume Calculations Name Area (ha) tc fi C10 Name Area (ha) tc fi C10 0.227 0.24 0.75 0.227 0.74 0.85 Total 0.227 10.0 0.75 Total 0.227 5.5 0.85 Frequency Frequency ARI Cy Iy Qy ARI Cy Iy Qy Factor A (Ha) Factor A (Ha) (years) (Fy*C10) (mm/h) (m3/s) (years) (Fy*C10) (mm/h) (m3/s) (Fy) (Fy) 3 mth 0.018 3 mth 0.025 1 0.800 0.599 97 0.227 0.037 1 0.800 0.679 118 0.227 0.051 2 0.850 0.636 132 0.227 0.053 2 0.850 0.721 159 0.227 0.073 5 0.950 0.711 148 0.227 0.066 5 0.950 0.806 216 0.227 0.110 10 1.000 0.749 172 0.227 0.081 10 1.000 0.848 247 0.227 0.132 20 1.050 0.786 196 0.227 0.097 20 1.050 0.891 277 0.227 0.156 50 1.150 0.861 225 0.227 0.122 50 1.150 0.975 316 0.227 0.194 100 1.200 0.898 247 0.227 0.140 100 1.200 1.000 345 0.227 0.218 Page 1 of 1 19/03/2024
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