Attachment 4 - Engineering Report · MCU18/0015

DETENTION TANK DESIGN — TH4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rainfall Intensities (mayhour) Tittle Page
ARS (years) 1 2 10 50 100
fomusomm = 10) 1273.2? 4 year ARI hyarograph
comunccorm 408 1d 72481108 2yner Arent
120 minute storm 26 «4334 «481 «851 728 10 year ARIhydrograph
50 year ARihydrograph
Catchment information 100 year ARI hydrograph
aaa See eee i ty buth, or good grass cover, ar)
Mies SO Aras Re
‘ecacuee = [oool) ¢henceCy= 07 )
1, paonmoren eres = [ico |~) ¢henceCy= 09
4, pommenonere promaret, = [oso|+) (henceCy= 062 ) Duh
T.O.C. peecmenonert = 10 min — = Maximum water depth in tank is 1754mm_
T.O.C. pesmatomee = 6 min
Detention Tank information |
Gravity = 9.8 mis? |
NOdan = 245m? |
Ge = 062 i |
Tank Outlet information | —— 1 Nores/Help
. Orifice Number 1 2 3 4 5
haters Se
Peak combined outflow from catchment (m*/s)
AR! (Years) 2 10 50 100
Qre | Qross | Qpre | Qrox | Qrre | Qpose | Qrre | Grose | Qre | Qros
5 minute storm 0.00 401 0.00 5.20 0.00 7.82 0.00 11.03 0.00 12.36
10 minute storm 459 4.83 6.20 6.26 9.94 9.39 1640 | 13.36 17.70 14.91
30 minute storm §42 547 1.32 113 11.82 10.83 16.46 14.42 18.91 16.09
60 minute storm 47 489 6.39 6.46 10.49 10.06 | 15.07 43.80 17.35 15.42
120 minute storm 3.53 3.81 4.82 5.08 8.17 8.21 11.20 11.04 13.03 12.45
Maximum tank depth (mm)
ARI (Years) 1 2 10 50 100
5 minute storm 170.0 | 251.9 | 4696 761.3 861.5
10 minute storm 2397 | 364.0 696.7 | 1151.9 | 1307.5
30 minute storm 296.9 | 459.5 9127 | 1438.2 | 1647.0
60 minute storm 2587 | 415.4 897.9 | 1515.7 | 1753.7
120 minute storm 181.8 | 296.9 688.4 | 1131.8 | 1345.5