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Stormwater Management Plan · MCU15/0122
Attached to the e-mail MCU15/0122 Development Application - Stormwater Management Plan Email 3 of 5..
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Rational Method Peak Flow Calculations
Job No: 15099 MORGAN CONSULTING
Job Type: Proposed Medical Development ENGINEERS PTY LTD
Address: Cnr Val Crescent and Goodchap Street, Noosaville 1 GREAT GEORGE STREET
Council: Noosa Council PADDINGTON QLD 4064
IFD Data: Noosa Minor Storm: Q2 Designed: RP
1
I10 72mm/hr Major Storm:Q100 Checked: HM
Pre-Development Post-Development
Time of Concentration
Standard Inlet Time Standard Inlet Time
Standard Inlet Time 0 mins QUDM 2007 4.06 Standard Inlet Time 5 mins QUDM 2007 4.06
Sheet Flow (Friends Equation) QUDM 2007 - Table 4.06.3 Sheet Flow (Friends Equation) QUDM 2007 - Table 4.06.3
Sheet flow length (L) 45 m Sheet flow length (L) m
roughness (n) 0.03 short grass roughness (n) short grass
Fall of NSL 1.96 m Fall of NSL m
Slope of Surface (S) 4.4 % Slope of Surface (S) %
total 8.5 mins total 0.0 mins
Concentrated Overland Flow Pipe Flow
Flow distance 25 m Flow distance m
velocity 1 m/s Fall of channel m
mins 0.4 mins QUDM 2007 - Figure 4.09 Flow Velocity m/s
Surface type multiplier 1.0 total 0.000 mins
total 0.4 mins
Total tc 8.9 mins Total tc 5.0 mins
Runoff Volume Calculations
Name Area (ha) tc fi C10 Name Area (ha) tc fi C10
0.4325 0.32 0.74 0.4325 0.83 0.86
Total 0.433 8.9 0.74 Total 0.433 5.0 0.86
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 0.037 3 mth 0.053
1 0.800 0.590 104 0.433 0.074 1 0.800 0.687 130 0.433 0.107
2 0.850 0.627 132 0.433 0.100 2 0.850 0.730 164 0.433 0.144
5 0.950 0.701 164 0.433 0.138 5 0.950 0.816 202 0.433 0.198
10 1.000 0.738 181 0.433 0.161 10 1.000 0.859 223 0.433 0.230
20 1.050 0.775 206 0.433 0.192 20 1.050 0.902 253 0.433 0.274
50 1.150 0.849 238 0.433 0.243 50 1.150 0.988 292 0.433 0.346
100 1.200 0.886 263 0.433 0.279 100 1.200 1.000 321 0.433 0.386
Detention Tank Orifice Plate Sizing Required: Pipe size required at outlet to maintain existing minor flow:
Item Orifice Item
Pre-development minor flow Q2 (m3/s) 0.100 dia (mm) 375
Cd A (m2) 0.11
g (m/s2) 9.81 (n) 0.013
h (m) P 1.18
A (m2) #DIV/0! Slope (%) 2.2
Orifice Plate dia (mm) #DIV/0! Slope (1 in X) 45.5
Pipe Capacity, Q (m3/s) 0.260
Total Minor Storm Peak Flow (m3/s) 0.100
Page 1 of 1 21/09/2015
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