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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
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) 30.35 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 1.138 m Fall of NSL 0.644 m
Slope of Surface (S) 5.3 % Slope of Surface (S) 3.7 % Slope of Surface (S) 1.9 %
total 8.1 mins total 9.0 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 9.0 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 0.160 0.10 0.72 0.125 0.59 0.80
Total 0.265 8.1 0.74 Total 0.160 9.0 0.72 Total 0.125 10.8 0.80
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 0.014 3 mth 0.011
1 0.800 0.589 110 0.265 0.048 1 0.800 0.576 106 0.160 0.027 1 0.800 0.641 99 0.125 0.022
2 0.850 0.626 124 0.265 0.057 2 0.850 0.612 119 0.160 0.032 2 0.850 0.681 111 0.125 0.026
5 0.950 0.699 168 0.265 0.086 5 0.950 0.684 162 0.160 0.049 5 0.950 0.761 151 0.125 0.040
10 1.000 0.736 197 0.265 0.107 10 1.000 0.720 189 0.160 0.061 10 1.000 0.801 176 0.125 0.049
20 1.050 0.773 224 0.265 0.127 20 1.050 0.756 215 0.160 0.072 20 1.050 0.841 199 0.125 0.058
50 1.150 0.846 259 0.265 0.162 50 1.150 0.828 248 0.160 0.091 50 1.150 0.921 230 0.125 0.073
100 1.200 0.883 286 0.265 0.186 100 1.200 0.864 273 0.160 0.105 100 1.200 0.961 252 0.125 0.084
Page 1 of 1 25/01/2021
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