NIZAMUDDIN
EAST COLONY’S RAINWATER HARVESTING SYSTEM
RAINWATER AVAILABLE FOR
HARVESTING
Total rooftop and surface area:
2,00,916 square metres (sq m)
Average annual rainfall in Delhi: 611 millimetres (mm)
Total volume of rainwater harvested:
48,531 cubic metres (m 3 ) or 4,85,13,149
litres.
Therefore, 39.6 per cent of total rooftop and surface runoff
is being harvested.
WATER SUPPLY SOURCE
Private bore wells, coupled with municipal supply.
RAINWATER HARVESTING SYSTEM
Rooftop water from the buildings is discharged into storm
water drains, and
then it flows along with surface runoff.
This water is collected in a collection chamber of size 0.45
m x 0.45 m x 0.5
m which is covered with a perforated slab and placed a low
lying area so that
water can flow into the collection chamber naturally. Rainwater
from this
chamber will be diverted to a recharge well measuring 1 m
x 1 m x 2 m. This
recharge well is provided with a 10 m deep recharge bore of
150 mm
diameter. The recharge well is also provided with layers of
pebbles and
coarse sand to ensure proper filtration of storm water used
for recharge.
Implementation of this project was completed in January 2004,
and the
water level as in January 2005 was around 7.3 m below ground
level (bgl).
Cost of the rainwater harvesting system:
Rs 1.74 lakh.
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