Stormwater Management Plan MCU17/0014

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[OCR of page images]
13/12/2016 +

INITIAL PEAK FLOW CALCULATIONS

Job Number: 16336

Job Name: DOONELLA UNITS
TEWANTIN

Designed: Jl

Checked: JV

TOTAL RUNOFF COEFF.

Based on QUDM (2008) 4.00 ‘Catchment Hydrology’
Written by BB 31/10/08

IFD Location:[ _ TEWANTIN

 

JOB No:-

BORNHORST + WARD

7

Wt
‘

 

CIVIL AND STRUCTURAL

 

EXISTING TIME OF CONCENTRATION

 

DEVELOPED TIME OF CONCENTRATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

‘Sub Catchment Area Runoff Cooficionts Calculated G10 Sta inlet Time 5 Sta tnlet Time 10]
] —_|re sope 67 B |otess qi
3 ite Slope (%) 3 ite Slope (
5 Flow Length (m) 30 5 Flow Length (m) |
[Hortons *n" 0.05 Wy Jorton's “ar |
= =
GB __ [reaver time (min) 1136 @B [reaver Time (min) 0.0]
2 Travel Length (m) ql 2 Travel Length (m) 4
ae [rai (m | JZ fraiiim) 0.45)
BQ Airave q Zo frown 4
ZZ [Travertine iin) 2 [raver Tine (min
Zw rutipior o Zu |mutipier 1
= =
& Havel Time (in) & rravet Time (min) 2|
Total Time (Te) 16.4 FFotal Time (Fe) 12.0
PEAK RUNOFF CALCULATIONS PEAK FLOWS FOR FREQUENT EVENTS
Rainfall Intonciety (mmihe) | Coeficient of Runoff Peak Runoff Rates (m"3/s) ‘ARI Event %orat Peak discharge (m"s)
ARI Event yr| Existing Existing Existing Proposed ye Existing Proposed
7 at 92 061 o7o] 0.035 0.045 ‘mth 25% 0.008 0.077
2 103 “7 oss ova] 0.047 0.061 2th 40% 0.014 0.018
5 128 145, o72 os} 0.064 0.084 mth 50% 0.017 0.022
10 142 160 076 087] 0.075 0.098 enth 60% 0.021 0.027
20 161 182 0.80 oss] 0.090 0.116 mth 75% 0.026 0.034
50 186 an 087 100] 0.114 0.147 mth 90% 0.031 0.040
100 205 232 ost 100] 0.434 0.162 ‘2mth 100% 0.035 0.045