Attachment 4 - Engineering Report · MCU18/0015

DETENTION TANK DESIGN — TH3

Rainfall stensities (mm/hour) Title Page

 

 

ARI (years) 1 2 10 50 100
5 minute storm 130 165 224 291 320
1Ominnestom 100 127 173° «227-250 ‘Tysar ARI hydrograph
30 minute storm 602 765 105 138 152 2 ARID
6Ominute storm 40.6 «519-724 «98-1108 sine, ARI RROD!
120 minute storm 26 334 484 65.1 726 10 year ARIhydrograph
50 year ARthydrograph
Catchment information 100 year ARI hydrograph
Area = 299.25 wf =
— 2 | Medium density bush.o good grass cover, or HH *!
Al€2 sompaceaee poranez, = 165m = -
hea = 194.25 m? [Medium solpermeabiny [=] Analysis Results
Soanamer = [ooo[y) (henceCy= 07 J
t E = [ico [¥) (henceCy= 09 )
fh pomoemusnet :poranes, = jo6o|~) (nenceCy= 062 ) cif
T.0.C. peemmcpewe = 10 min i Maximum water depth in tank & 1754mm
TOC paeapane = 6 min |
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Detention Tank information
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Gravity = 98 ms* | |
Adan = 245 mt |
Cy = 062 |
Tank Outiet Information — = Notes/Help
Orifice Number t 2 3 4 5 6

Orifice diameter (mm) 50 [ 1
Orifice invert level (mm)

 

Peak combined outflow from catchment (m7/s)

ARi (Years) 1 2 10 50 100

OPre QPost Qrre Qpost Qrre Qeosr Qpre Qpost QPre Qros
§ minute storm 0.00 4.01 0.00 5.20 0.00 7.82 0.00: 11.03 0.00 12.36
10 minute storm 4.59 4.83 6.20 6.26 9.94 9.39 15.40 13.36 17.70 14.91
30 minute storm $42 5.47 7.32 7.13 11.82 10.83 16.46 14.42 18.91 16.09
60 minute storm 4 4.89 6.39 6.46 10.49 10.06 15.07 13.80 17.35 16.42

120 minute storm ted 3.81 4.82 5.08 8.17 8.21 11.20 11.04. 13.03 12.45

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum tank depth (mm)

 

 

5 minute storm 170.0 251.9 469.6 161.3 861.5
10 minute storm 239.7 364.0 696.7 | 1151.9 | 1307.5
30 minute storm 296.9 459.5 912.7 | 1438.2 | 1647.0
60 minute storm 258.7 415.4 897.9 1615.7 | 1753.7
120 minute storm 181.8 295.9 688.4 | 1131.8 | 1346.5