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Site Based Stormwater Managment Plan
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Log in to see the plans as drawnRational Method Peak Flow Calculations Job No: 20169 MORGAN CONSULTING Job Type: Proposed Townhouse Development ENGINEERS PTY LTD Address: 99, 101 & 105 Eumundi Noosa Road 1 GREAT GEORGE STREET Council: Noosa PADDINGTON QLD 4064 IFD Data: 26.4125 (S),153.0375 (E) Minor Storm: Q10 Designed: DY 1 I10 74mm/hr Major Storm: Q100 Checked: HM Pre-Development A Pre-Development B Pre-Development C Time of Concentration Standard Inlet Time Standard Inlet Time Standard Inlet Time Standard Inlet Time mins Standard Inlet Time mins Standard Inlet Time mins Sheet Flow (Friends Equation) Sheet Flow (Friends Equation) Sheet Flow (Friends Equation) Sheet flow length (L) 27.7 m Sheet flow length (L) 77 m Sheet flow length (L) 34.44 m roughness (n) 0.035 short grass roughness (n) 0.035 short grass roughness (n) 0.035 short grass Fall of NSL 1.478 m Fall of NSL 3.248 m Fall of NSL 0.644 m Slope of Surface (S) 5.3 % Slope of Surface (S) 4.2 % Slope of Surface (S) 1.9 % total 8.1 mins total 11.9 mins total 10.8 mins Concentrated Overland Flow Concentrated Overland Flow Concentrated Overland Flow Flow distance m Flow distance m Flow distance m velocity 1.5 m/s velocity 1.5 m/s velocity 1.5 m/s mins 0.0 mins mins 0.0 mins mins 0.0 mins Surface type multiplier 3.0 Surface type multiplier 3.0 Surface type multiplier 3.0 total 0.0 mins total 0.0 mins total 0.0 mins Total tc 8.1 mins Total tc 11.9 mins Total tc 10.8 mins Runoff Volume Calculations Name Area (ha) tc fi C10 Name Area (ha) tc fi C10 Name Area (ha) tc fi C10 0.265 0.18 0.74 0.467 0.19 0.74 0.136 0.55 0.79 Total 0.265 8.1 0.74 Total 0.467 11.9 0.74 Total 0.136 10.8 0.79 Frequency Frequency Frequency ARI Cy Iy Qy ARI Cy Iy Qy ARI Cy Iy Qy Factor A (Ha) Factor A (Ha) Factor A (Ha) (years) (Fy*C10) (mm/h) (m3/s) (years) (Fy*C10) (mm/h) (m3/s) (years) (Fy*C10) (mm/h) (m3/s) (Fy) (Fy) (Fy) 3 mth 0.024 3 mth 0.036 3 mth 0.012 1 0.800 0.589 110 0.265 0.048 1 0.800 0.590 95 0.467 0.073 1 0.800 0.633 99 0.136 0.024 2 0.850 0.626 124 0.265 0.057 2 0.850 0.627 107 0.467 0.087 2 0.850 0.673 111 0.136 0.028 5 0.950 0.699 168 0.265 0.086 5 0.950 0.701 145 0.467 0.132 5 0.950 0.752 151 0.136 0.043 10 1.000 0.736 197 0.265 0.107 10 1.000 0.738 169 0.467 0.162 10 1.000 0.791 176 0.136 0.053 20 1.050 0.773 224 0.265 0.127 20 1.050 0.775 192 0.467 0.193 20 1.050 0.831 199 0.136 0.063 50 1.150 0.846 259 0.265 0.162 50 1.150 0.849 221 0.467 0.243 50 1.150 0.910 230 0.136 0.079 100 1.200 0.883 286 0.265 0.186 100 1.200 0.886 242 0.467 0.278 100 1.200 0.950 252 0.136 0.090 Page 1 of 1 10/08/2021
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