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RFI - ATTACHMENT A - SBSMP - Rev 2
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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
Post-Development A Post-Development B Post-Development C
Time of Concentration
Standard Inlet Time Standard Inlet Time Standard Inlet Time
Standard Inlet Time 5 mins Standard Inlet Time 5 mins Standard Inlet Time 5 mins
Pipe Flow m Pipe Flow m Pipe Flow m
Flow distance 83 Flow distance 83 Flow distance
Fall of channel m Fall of channel m Fall of channel m
Flow Velocity 2.5 % Flow Velocity 2.5 % Flow Velocity 2.5 %
total 0.6 mins total 0.6 mins total 0.0 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 5.6 mins Total tc 5.6 mins Total tc 5.0 mins
Runoff Volume Calculations
Name Area (ha) tc fi C10 Name Area (ha) tc fi C10 Name Area (ha) tc fi C10
0.3415 0.70 0.84 0.1274 0.50 0.80 0.0799 1 0.90
Total 0.342 5.6 0.84 Total 0.127 5.6 0.80 Total 0.080 5.0 0.90
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 0.039 3 mth 0.014 3 mth 0.010
1 0.800 0.672 121 0.342 0.077 1 0.800 0.640 121 0.127 0.028 1 0.800 0.721 124 0.080 0.020
2 0.850 0.714 137 0.342 0.093 2 0.850 0.680 137 0.127 0.033 2 0.850 0.766 140 0.080 0.024
5 0.950 0.798 187 0.342 0.141 5 0.950 0.760 187 0.127 0.050 5 0.950 0.856 191 0.080 0.036
10 1.000 0.840 220 0.342 0.175 10 1.000 0.800 220 0.127 0.062 10 1.000 0.901 225 0.080 0.045
20 1.050 0.882 251 0.342 0.210 20 1.050 0.840 251 0.127 0.075 20 1.050 0.946 257 0.080 0.054
50 1.150 0.966 292 0.342 0.268 50 1.150 0.920 292 0.127 0.095 50 1.150 1.000 299 0.080 0.066
100 1.200 1.000 323 0.342 0.306 100 1.200 0.960 323 0.127 0.110 100 1.200 1.000 331 0.080 0.073
Page 1 of 1 1/02/2021
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