Attachment 4 - Engineering Report · MCU18/0015

DETENTION TANK DESIGN — TH13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rainfall intensities (mm/hour) Title Page
ARt (years) ' 2 170 «50 = 100
Sminste storm 120,—S 165224291320
{@minctestorm = 100,127, «173,-=S «207250, f year ARI hyemagreph
J0mmutestom 602 765 105 138 152 2 year ARIhydrograph
60 minute storm = 406 519724 «981108
120 minute storm 2 «304481851726 10 year ARIhydrograph
50 year ARIhydrograph
Catchment information 100 year ARt hydrograph
Ae: = 227m
A See ace = 460 es | Medium density bush, o: goodgrass cover, or *) eae
ATCA pesematonet promis = 67 m2 | Medium soilpermeabsty {=} ___AnayysisResuns |
{easement =[Joco[s) ¢nenceCe= 07 )
{ peumeanpant james = |100 [=| (henceCy= 09 )
Ny poasmmeosret wma = fosol») (henceCy= 062 ) Critive costijaretes
T.O.C. sencmetsonact = 10 min ta = —} Maximum water depth in tank is 1675mm
T.O.C, serene = 6 min |
Detention Tank information |
Gravity = 9B mvs? |
Area wre = 245m? |
Cs = 062 | |
Tank Outlet information PaaS Eee reall Notes/Help
Oritice Number 1 2 3 4 5
Orifice diameter (nm) 50
‘Orifice invert level (mm)
Peak combined outflow from catchment (m7/s)
ARI (Years) 1 2 10 50 100
Qrre QPost QPre QPosr QPre Qrosz Fre QPast Ore QPost
5 minute storm 0.00 2.89 0.00 3.68 0.00 §.33 0.00 1.23 0.00 7.97
10 minute storm 3.49 3.56 4.70 457 754 6.68 11.68. 9.21 13.43 10.14
30 minute storm 4.11 3.99 §.55 §.13 8.97 7.62 12.48 9.97 14.35 10.99
60 minute storm 3.57 3.61 4.85 42 196 721 11.43 272 13.16 10.73
120 minute storm 2.68 2.90 3.66 3.85 6.20 6.14 4.49 8.14 9.88 9.07
Maximum tank depth (mm)
AR! (Years) 1 2 10 50 100
5 minute storm 163.4 241.9 450.8 031.3 827.7
10 minute storm 229.7 348.7 668.1 1105.9 1255.9
30 minute storm 233.8 439.4 873.9 1377.2 1577.5
60 minute storm 246.8 396.1 856.4 1447.3 1675.4
120 minute storm 173.4 281.7, 655.4 1077.5 1281.6