Attachment 4 - Engineering Report · MCU18/0015

DETENTION TANK DESIGN — TH10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rainfall imensities (mmvhour)
ARI (years) 1 2 10 50 100
5 minute storm 130 «168 «Cis 291 320
10 minute storm 400-127-173 Fs 28
30 minute stom 602 765 105 138 152
60 minute storm 406 519 724 961 106
120 minute storm 26 334 481 65.1 726
Catchment Information
Are; = 309.25 m*
a eee ‘en a 475 m_ | Medium density bush oc good grass cover. H™
ea = 134.25 mn? | Mecum sod permeabary [) Analysis Results
es = [oool+) ¢menceCy= 07 J
i pocemiopret (curines = |icoly) (meneCy= 09 }
i pumonengret arcetares) = foeol™) theneCe_= 082 j
T.0.C. preceeinpmect = 40 min TI Maximum water depth in tank is 1973mm
T.O.C. pesometoprant = 6 min |
Detention Tank information
Gravity = 9.8 ms* |
ATE8 ore = 24507 |
Cy = 062 | |
|
Tank Outlet information = Notes/Help
Orifice Number 1 2 3 4 5
Orifice diameter so [ 1
orice invert evel tm) a
Peak combined outflow from catchment {(m*/s)
ARI (Years) 1 2 10 50 100
OFre QPos Ore Qros Qrr QPost Qrre QPpost QPre Qrosx
§ minute storm 0.00 4.08 0.00 5.28 0.00 7.92 0.00 11.16 9.00 12.49
10 minute storm 475 4.94 641 6.39 10.27 9.55 15.92 13.57 18.29 18.12
30 minute storm 5.60 559 TS 7.28 12.22 11.02 17.01 14.64 49.56 16.33
60 minute storm 4.87 §.04 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 11.31 13.47 412.73
Maximum tank (mm)
AR! (Years) 1 2 10 50 100
§ minute storm 183.6 272.4 507.7 822.0 9297
10 minute storm 260.2 395.0 7545 | 1244.6 | 1412.0
30 minute storm 323.4 500.4 $81.5 1562.1 | 1787.9
60 minute storm 283.3 455.2 982.8 1654.6 | 1913.0
120 minute storm 199.4 325.0 756:0 1242.8 | 1475.9