SPINAL INJURY CENTRE'S RAINWATER
HARVESTING SYSTEM
RAINWATER AVAILABLE FOR HARVESTING
Total area - 52,598 square metres (Sq m)
Average annual rainfall in Delhi - 611 millimetre (mm)
Total volume of water harvested - 27,317 cubic metre (m³)
or 273,17,000 litres
This represents 85 per cent of the total rainwater harvesting
potential.
WATER SUPPLY SOURCE
The Centre's water requirements are met by four borewells located
on the hospital premises.
RAINWATER HARVESTING SYSTEM
Hospital building:
The rooftop rainwater and the surface runoff from the western
part of the building are drained into a stormwater drain that
runs to the west side of the building. This water is diverted
into a recharge well located at the northwest corner of the
campus near an existing borewell. A part of the rooftop rainwater
from the east side of the hospital building and runoff from
the paved area are diverted through a network of pipes and collection
chambers to another stormwater drain that runs to the north
of the premises. This runoff is also diverted to the same recharge
well located near the borewell. This recharge well is 2.75m
in length and 2.13m in breadth and is 1.82m deep. This recharge
well is provided with a recharge bore of 100mm diameter and
is 20m deep. This recharge well has two compartments, and the
runoff water undergoes two stages of filtering before it enters
the recharge borewell. Layers of brickbats and sand ensure the
quality of water used for recharging purposes.
Staff quarters area:
The rooftop rainwater and the surface runoff from the paved
and unpaved areas are collected in chambers interlinked by pipes.
This water is used for recharge purposes by diverting it to
two recharge wells. Part of this water is diverted to recharge
the east side of the staff quarters and the rest is harvested
by converting a dry borewell into recharge well near the entrance
of staff quarters. These recharge wells are measure 1.5m in
diameter and are 2m deep; the recharge borewell measures 20
meters.
The implementation was completed on October 2002 and the water
level on February 2003 was measured at 32m below ground level
(bgl).
The cost of the entire rainwater harvesting system was Rs 0.80
lakh.
IMPACT
Water level data
This project confirmed that is is possible to arrest declining
water levels through rainwater harvesting. Before the system
was implemented, the water level in the hospital stood at 32.2m
below ground level (bgl) in April 2003. Concerned with falling
water levels, and with growing dependence on groundwater, the
Indian Spinal Injury Center's authorities decided to adopt rainwater
harvesting on the hospital premises.
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