Post on 03-Apr-2018
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PILOT PROJECT 3:
Detention Storage Cum Rainwater Harvesting System at DID
Headquarters, Kuala Lumpur
THE HEADQUARTERS OF DEPARTMENT OF
IRRIGATION AND DRAINAGE(DID), KUALA LUMPUR
Underground storage
tank underconstruction
MAIN COMPONENT OF RAINWATERHARVESTING SYSTEM
Gutter
Catchments area(roof)
Downspouts
and piping Underground Storage Tank
Underground
storage tank
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DEPARTMENT OF IRRIGATION
AND DRAINAGE (DID)
HEAD-QUARTERS COMPLEX
Storage tank
Roof as catchments area
Undergroundstorage tank
DID HEAD-QUARTERS COMPLEX
Consists of a block
of 4-storied which
is the standard
office building with
flat roof
Roof of this
building is attached
via central gutter
(size of 600 mm in
depth)
60% of the water
collected will flow
into central gutter
Collected water
will discharge to
the perimeter drain
at ground level
Rainwater flow
into two of 150
mm rainwater
downpipe.
Downpipe
Roof as catchments area
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The system uses
a header tank on
the roof of the
building
The water is
store in
underground
storage tank
Rainwater from downpipe
Header tank
Underground
storage tank
Tankinstallation
Toilet flushing
Main component of
rainwater harvesting system
Catchments system
Filtering system
pump
Header tank
Internal plumbingConveyance system
Storage tank
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Components of rainwater harvesting
system distribution network
Internal Plumbing (Diagrammatic)
Toilet flush
External
Installation ofInstallation of
Detention Storage Cum Rainwater Harvesting SystemDetention Storage Cum Rainwater Harvesting System
at DID Headquarters, Kuala Lumpurat DID Headquarters, Kuala Lumpur
JPSJPS HqHq. Building Roof Area:. Building Roof Area: 1,688.85 m1,688.85 m22 (calculated)(calculated)
Total JPSTotal JPS HqHq. staff:. staff: 250 (est.)250 (est.)
Average water use per person:Average water use per person: 25 liters/day.25 liters/day.
Total water use per day:Total water use per day: 250 x 25 = 6,250 liters/day.250 x 25 = 6,250 liters/day.
storage tank size:storage tank size:
(Say 3 days water storage):(Say 3 days water storage): 6,250 x 3 = 18,750 lit6,250 x 3 = 18,750 lit
Water for plants (25m.sq):Water for plants (25m.sq): 6.3 litres/m6.3 litres/m22/day(est.)/day(est.)
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Installation ofInstallation of
Detention Storage Cum Rainwater Harvesting SystemDetention Storage Cum Rainwater Harvesting System
at DID Headquarters, Kuala Lumpurat DID Headquarters, Kuala Lumpur
Tank Size (m3) Reliability (%)
40 57.53
50 60.74
60 63.64
70 66.31
80 67.95
90 69.67
100 70.93
110 72.02
120 72.98
Tank Size Vs Reliability
0
10
20
30
40
50
60
70
80
90
100
0 20 40 60 80 100 120 140
Tank Size (cu. m)
Reliabilty(%)
Reliability (%)
Installation ofInstallation of
Detention Storage Cum Rainwater Harvesting SystemDetention Storage Cum Rainwater Harvesting System
at DID Headquarters, Kuala Lumpurat DID Headquarters, Kuala Lumpur
To determine the critical storm duration for Detention Storage Size RequiredCs = 1
td (min) I (mm/h) Runoff Coeff Area (m2) Qd (l/s)
Qbefore
(PSD)
T= 10 yr c d SSR (m3)
5 380 0.91 1688 162.2 41.1 124.94 6.09 40.81
10 263 0.91 1688 112.3 41.1 237.61 17.61 52.04
15 208 0.91 1688 88.8 41.1 340.61 33.39 57.46
20 175 0.91 1688 74.5 41.1 434.88 53.05 60.14
25 152 0.91 1688 64.7 41.1 520.94 76.33 61.26
30 135 0.91 1688 57.5 41.1 599.14 103.09 61.40
35 122 0.91 1688 51.9 41.1 669.75 133.20 60.88
40 111 0.91 1688 47.5 41.1 732.95 166.59 59.92
45 103 0.91 1688 43.8 41.1 788.90 203.18 58.66
50 95 0.91 1688 40.7 41.1 837.74 242.93 57.20
55 89 0.91 1688 38.0 41.1 879.56 285.77 55.61
60 84 0.91 1688 35.8 41.1 914.46 331.67 53.94
65 79 0.91 1688 33.8 41.1 942.52 380.60 52.25
Site S torage Requirement (SSR) = 0.06(Qdtd-c -d)
c= 0.675PSDtd(1-0.392PSD/Qd)
d= 0.117tdPSD2/Qd
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