Attachment 4 - Engineering Report · MCU18/0015

DETENTION TANK DESIGN — TH11

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rainfall imensities (mm/nour) Title Page
ARI (years) 1 2 7 80 100
Sminuescom 130165224281 320
10minue storm = 1001271732250
30minutestom = 602-765) 105 138152
6Ommurestorm 406 S19 724 96.1 106
120 mite storm 2% 334 481 651 726
Catchment information
= 294.25 mt =
ers i 5 160. mt_ | Medien denstybush-o good ats cover Hs)
neal 5 jen? | Mecium scil perme abixy {=} ‘Aneiyals Resutts
4 preamp = |ooo +| (menceCw= OF 3
f pare foxy = [100 (=) (henceCy= 09 )
fi pomcmsaicraar pneu = Josoly) ¢menceCe= 082 ) Csiteas Contigursticn
TOC) peso = 10 min aaa -— Maximum water depth in tank is 1675mm
ey = 6 min |
Detention Tank information |
Gravity = se ms*
Ae2 wn = 245 mF |
cy = 062
Tank Outlet information Naeger Fae te | ‘Neseaiilet
Orifice Number 1 2 3 4 5 6
‘Orifice diameter (mm) 5a
Orifice invert level (mm)
Peak combined outflow from catchment (m*/s)
ARI (Years) t 2 10 50 100
Qrre Qpose QOPre QPost Qrre QPost Opre Qrese Qrre QPost
§ minute storm 0.00 3.98 0.00 5.16 0.00 7.76 0.00 10.97 6.00 12.30
10 minute storm 452 497 6.10 §.20 977 9.30 15.15 13.26 17.40 14.80
30 minute storm §.33 541 720 7.06 11.62 10.73 16.18 14.30 18.60 15.96
60 minute storm 4.63 4.83 6.29 6.39 10.32 9.96 14.82 13.67 17.06 15.28
120 minute storm 347 3.75 474 5.01 8.03 8.11 11.01 10.91 12.81 12.30
Maximum tank depth (mm)
ARI (Years) 1 2 10 50 100
§ minute storm 163.4 241.9 450.8 7313 827.7
10 minute storm 2297 348.7 668.1 1105.9 | 1255.9
30 minute storm 283.8 439.4 873.9 | 1377.2 | 1577.5
60 minute storm 246.8 396.4 856.4 1447.3 | 1675.4
120 minute storm 134 281.7 655.4 1077.5 | 1281.6