OSD Design
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On-site Detention (ODS) Pond Design: Design ARI 10 years: Development Impervious Area Pervious Area Total CA I Q Status C A C A (mm/ hr) (L/s) Pre- 0 0 0. 55 43896.2 5 24142. 94 247.4 4 1660.7 52 Development Post- 0. 93 18227.9 8 0. 54 25668.2 7 30812. 86 247.4 4 2119.5 65 Development Design ARI 50 years: Development Impervious Area Pervious Area Total CA I Q Status C A C A (mm/ hr) (L/s) Pre- 0 0 0. 55 43896.2 5 24142. 94 299.2 8 2008.6 89 Development Post- 0. 93 18227.9 8 0. 54 25668.2 7 30812. 86 299.2 8 2563.6 25 Development a b PSD 10690. 38 140802 87 1538. 48 td L Impervious Area Pervious Area Total Qd Pervious Area (m 2 ) 25668. 27 Impervious Area (m 2 ) 18227. 98 t c (min) 10 t cs (min) 10
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Transcript of OSD Design
Pervious Area (m2)25668.27
Impervious Area (m2) 18227.98
tc (min)10
tcs (min)10
On-site Detention (ODS) Pond Design:Design ARI 10 years:
DevelopmentImpervious AreaPervious AreaTotal CAIQ
StatusCACA(mm/hr)(L/s)
Pre-000.5543896.2524142.94247.441660.752
Development
Post-0.9318227.980.5425668.2730812.86247.442119.565
Development
Design ARI 50 years:
DevelopmentImpervious AreaPervious AreaTotal CAIQ
StatusCACA(mm/hr)(L/s)
Pre-000.5543896.2524142.94299.282008.689
Development
Post-0.9318227.980.5425668.2730812.86299.282563.625
Development
abPSD
10690.38140802871538.48
tdLImpervious AreaPervious AreaTotalQd
(mins)(mm/hr)CACACA(L/s)
5315.410.918227.9825668.270.7836426.433194.015
10247.440.918227.9825668.270.6733602.922311.489
15200.880.918227.9825668.270.5931549.461761.868
20169.170.918227.9825668.270.5430266.051423.39
30130.360.918227.9825668.270.4628212.591022.426
tdQdPSDcdSSR
(mins)(L/s)(L/s)(m3)
53194.0151538.481048.546158.5844596.0652
102311.4891538.48934.9136219.132694.4658
151761.8681538.48806.6209287.4909600.9809
201423.391538.48678.3174355.8555467.0603
301022.4261538.48416.4067495.4108199.0961
From the previous table, a maximum SSR of 694.4658 m3 occurs at duration of 10 minutes. Therefore:Required SSR = 694.4658 m3Proposes OSD Area = 27 x 26 = 702 m2Primary Outlet Size:
= 0.63 m2
= 0.89 m = 890 mmSecondary Outlet Size:
Broad-crested weir is sized for the estimated major system ARI flow from the site for tcs 20 minutes for 50 years ARIDevelopmentImpervious AreaPervious AreaTotal CA50I20Q
StatusCACA(mm/hr)(L/s)
Post-0.9318227.980.5425668.2730812.862011721.761
Development
= 20.4 mCacw = 1.45
A freeboard of 150mm is provided
Therefore, the dimensions for secondary outlet weir are:
21 m (wide) x 0.15 m (high)Emergency Outlet:
Emergency spillways is provided to safely pass a major design storm through the basin
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