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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
Post-Development Catchment 1 Post-Development Catchment 2
Time of Concentration
Standard Inlet Time Standard Inlet Time
Standard Inlet Time 5 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) 0 m Sheet flow length (L) m
roughness (n) 0 short grass roughness (n) short grass
Fall of NSL 0 m Fall of NSL m
Slope of Surface (S) % Slope of Surface (S) %
total 0.0 mins total 0.0 mins
Pipe Flow Pipe Flow
Flow distance 70 m Flow distance 230 m
velocity 2 m/s Fall of channel m
mins 0.6 mins QUDM 2007 - Figure 4.09 Flow Velocity 2 m/s
Surface type multiplier 1.0 total 1.917 mins
total 0.6 mins
Total tc 5.6 mins Total tc 6.9 mins
Runoff Volume Calculations
Name Area (ha) tc fi C10 Name Area (ha) tc fi C10
0.276 0.61 0.81 0.904 0.54 0.79
Total 0.276 5.6 0.81 Total 0.904 6.9 0.79
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 0.031 3 mth 0.091
1 0.800 0.644 125 0.276 0.062 1 0.800 0.631 115 0.904 0.182
2 0.850 0.685 159 0.276 0.083 2 0.850 0.671 146 0.904 0.246
5 0.950 0.765 195 0.276 0.115 5 0.950 0.750 180 0.904 0.339
10 1.000 0.806 216 0.276 0.134 10 1.000 0.789 200 0.904 0.396
20 1.050 0.846 245 0.276 0.159 20 1.050 0.828 227 0.904 0.472
50 1.150 0.926 283 0.276 0.201 50 1.150 0.907 262 0.904 0.597
100 1.200 0.967 312 0.276 0.231 100 1.200 0.947 289 0.904 0.686
Page 1 of 1 9/11/2015
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