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Stormwater Management Plan - Rev 1
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Log in to see the plans as drawn Rational Method Peak Flow Calculations
Job No: 20169 MORGAN CONSULTING
Job Type: Proposed Townhouse Development ENGINEERS PTY LTD
Address: 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 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) 59.5 m Pipe Flow
roughness (n) 0.035 short grass Flow distance 90 m
Fall of NSL 2.15 m Fall of channel m
Slope of Surface (S) 3.6 % Flow Velocity 2.5 m/s
total 11.3 mins total 0.6 mins
Concentrated Overland Flow Concentrated Overland Flow
Flow distance m Flow distance m
velocity 1.5 m/s velocity 1.5 m/s
mins 0.0 mins mins 0.0 mins
Surface type multiplier 3.0 Surface type multiplier 3.0
total 0.0 mins total 0.0 mins
Total tc 11.3 mins Total tc 5.6 mins
Runoff Volume Calculations
Name Area (ha) tc fi C10 Name Area (ha) tc fi C10
0.54882 0.25 0.75 0.5488 0.77 0.85
Total 0.549 11.3 0.75 Total 0.549 5.6 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 0.044 3 mth 0.063
1 0.800 0.600 97 0.549 0.089 1 0.800 0.683 121 0.549 0.126
2 0.850 0.637 110 0.549 0.106 2 0.850 0.725 137 0.549 0.151
5 0.950 0.712 148 0.549 0.161 5 0.950 0.811 187 0.549 0.231
10 1.000 0.750 173 0.549 0.197 10 1.000 0.853 220 0.549 0.286
20 1.050 0.787 196 0.549 0.235 20 1.050 0.896 251 0.549 0.342
50 1.150 0.862 226 0.549 0.297 50 1.150 0.981 291 0.549 0.436
100 1.200 0.900 247 0.549 0.339 100 1.200 1.000 322 0.549 0.491
Page 1 of 1 30/11/2020
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