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Appendix D_Engineering Report
Attached to the e-mail MCU15/0109 IDAS Forms, Planning Report & Engineering Report - Links Drive Noosa Heads.
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Rational Method Peak Flow Calculations
Job No: 15128 MORGAN CONSULTING
Job Type: Proposed Residential Development ENGINEERS PTY LTD
Address: Precinct E2, Noosa Springs, Noosa Heads 1 GREAT GEORGE STREET
Council: Noosa Council PADDINGTON QLD 4064
IFD Data: Noosa Minor Storm: Q10 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) 20 m Sheet flow length (L) m
roughness (n) 0.05 grass and shrubs roughness (n) short grass
Fall of NSL 4.2 m Fall of NSL m
Slope of Surface (S) 21.0 % Slope of Surface (S) %
total 7.9 mins total 0.0 mins
Concentrated Overland Flow Pipe Flow
Flow distance 100 m Flow distance 230 m
velocity 0.5 m/s
mins 3.3 mins QUDM 2007 - Figure 4.09 Flow Velocity 2 m/s
Surface type multiplier 1.0 total 1.910 mins
total 3.3 mins
Total tc 11.2 mins Total tc 6.9 mins
Runoff Volume Calculations
Name Area (ha) tc fi C10 Name Area (ha) tc fi C10
1.1832 0 0.35 1.1832 0.65 0.82
Total 1.183 11.2 0.35 Total 1.183 6.9 0.82
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 0.123
1 0.800 0.280 95 1.183 0.087 1 0.800 0.652 115 1.183 0.247
2 0.850 0.298 121 1.183 0.118 2 0.850 0.693 146 1.183 0.333
5 0.950 0.333 149 1.183 0.163 5 0.950 0.774 180 1.183 0.459
10 1.000 0.350 165 1.183 0.190 10 1.000 0.815 200 1.183 0.535
20 1.050 0.368 188 1.183 0.227 20 1.050 0.856 227 1.183 0.638
50 1.150 0.403 217 1.183 0.287 50 1.150 0.937 262 1.183 0.807
100 1.200 0.420 240 1.183 0.331 100 1.200 0.978 289 1.183 0.928
Page 1 of 1 9/11/2015
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