Attachment 4 - Engineering Report · MCU18/0015

DETENTION TANK DESIGN — TH1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rainfall intensities (mm/hour) Title Page
ARI years) 1 2 10 50-100
5 minute 130 165 «= 224281320
tommurestorm  00«127,—=«173,=« aT 280 f yoar AR RQROEEED
30 minute storm 602 765 105 138 182 nydrograph
60 minute storm 406 519 724 961 106 2 year ak
120 minute storm 28 «334 481 851 726 10 year ARIhydrograph
50 year ARthydrograph
‘Catchment information 100 year ARI hydrograph
ATG prosengnent = 309.25 m* pu,
Nedimmganeann = 195 me ["ecinderiytuh, eanedgnescom i) aaa
ATe2 peameetgeen / = 13425 im? | Medium 2211 petmeabiny al
fipemexoren = [o00[*) (henceCy= 87 }
f passeacomen ces) = [100 [~) (henceCy= 09 }
f pamsmerpret nceanes = [o6ol~) ¢henceCy= 062 §
OCs = 40 min —— —— Maximum water depth in tank is 1973mm
T.O.C. posaeveiogmert = 6 min |
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Detention Tank information |
Gravity = 9.8 mis* |
Aa oe = 2450 ) |
Cs = 062 |
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Tank Outfet Information 4 — — Notes/Help
Orifice Number 1 2 3 4 5 6
Orifice diameter (mm) 50
Orifice invert level (mm) (=== |
Peak combined outflow from catchment (m*/s)
ARI (Years) 1 2 10 50 100
QPre QPose Qere QPoest Qpre Qrosr Orr QPost QPre Qrose
§ minute storm 0.00 4.08 0.00 §.28 0.00 7.92 0.00 11.16 6.00 12.49
10 minute storm 4.75 4.94 6.41 6.39 10.27 9.55 15.92 13.57 18.29 15.12
30 minute storm 6.60 §.59 TAT 7.28 12.22 11.02 17.01 14.64 19.55 16.33
60 minute storm 487 5.01 6.61 6.61 10.85 10.27 15.58 14.05 17.93 15.69
120 minute storm 3.65 3.92 4.98 §.22 8.44 8.42 11.57 14.31 43.47 12.74
Maximum tank depth (mm)
ARI (Years) 1 2 10 50 100
§ minute storm 183.6 272.4 507.7 822.0 929.7
10 minute storm 260.2 395.0 7545 | 12446 | 1412.0
30 minute storm 323.4 500.4 991.5 | 1562.1 | 1787.9
60 minute storm 283.3 455.2 962.8 | 1664.6 | 1913.0
120 minute storm 199.1 325.0 756.0 | 1242.8 | 1475.9