SRI AUROBINDO ASHRAM'S RAINWATER
HARVESTING SYSTEM
RAINWATER AVAILABLE FOR
HARVESTING
Total area: 95, 870 square metres (Sq
m)
Average annual rainfall in Delhi: 611 millimetre
(mm)
Total volume of water harvested: 16, 366 cubic
metre (m³) or 1,63,65,879 litres
This represents 43 per cent of the total rainwater harvesting
potential.
WATER SUPPLY SOURCE
The water requirement is met through three tubewells and is
supplemented by Municipal water supply.
RAINWATER HARVESTING SYSTEM
In this campus the rainwater from various catchments, including
rooftop, surface runoff from open areas, is harvested.
Rooftop rainwater harvesting:
a)Mirambika school
The rooftop rainwater from the northern part of this building
is diverted to a dry open well of 18m depth and 2m depth through
a network of pipes and collection chambers. The silt from the
rooftop rainwater is filtered by using a desilting chamber of
0.6 m x 0.6m x 2.5m depth.
b)Mother's International school The rooftop rainwater from the northern part of this
building is drained to the playground located on the northern
part of the building. This roof water, in addition to the surface
runoff is harvested by two recharge wells of 1m x 1m x 2m in
dimension with a recharge bore of 16m depth. The rooftop rainwater
from the southern part of the building is canalised using a
network of interconnecting pipes and collection chambers to
a recharge well near the existing borewell. The recharge well
is 1.5m x 2m x 2.5m in size with a recharge bore of 150mm diametre
and 16m depth. A layer of pebble and sand is used to ensure
proper filtration.
c)Tapsya building The rooftop rainwater from this building is collected
through a network of pipes and chambers and diverted to the
dry open well of 15 m depth and 2m in dia. The rooftop rainwater
passes through a desilting chamber before it is diverted to
the recharge well.
d)Office block
Rooftop rainwater from the office block is diverted to an abandoned
borewell, which was converted to a recharge well by making a
pit of 1m x 1m x 2m around it. The recharge well is filled up
with pebbles and which acts as filtering media. Filtered water
enters the borewell and recharges the subsurface aquifers.
Surface water harvesting:
a)Near Mirambika School Part of the rooftop rainwater from the Mirambika School
and the surface runoff from the unpaved areas are collected
in two collection chambers which are provided with perforated
slabs. This surface runoff is diverted to a recharge well 1.5
m x 2 m x 2.5m in size with a recharge bore of 150 mm in diametre
and of 16m depth. The recharge well is filled with filtering
materials to ensure good water quality used for recharge.
b)Playground area The surface runoff from the playground area is collected
in collection chamber constructed at the northwest corner of
the playground. This collection chamber was converted to a recharge
well by drilling a recharge bore of 150 mm diametre of 18 m
depth. The recharge wells are filled with a layer of pebble
and sand for filtering the surface runoff, which also improve
the quality of water harvested.
c)Power station area
Surface runoff on the eastern side of the Mother's International
school building is collected in a open drain and diverted to
a recharge well adjacent to the power station near the existing
borewell. The recharge well is of 2.5m x 3m x 3m in size with
a recharge bore of 20 m depth.
d)Near Ashram building
Rooftop rainwater, along with the runoff from the paved areas
surrounding the Ashram building are collected in a recharge
well of 2.5m x 1.5m x 2m in size with a recharge bore of 20m
depth. The recharge well is filled with a layer of pebble and
sand for filtering the surface runoff that improves the quality
of water harvested.
The implementation was completed in January 2003 and the water
level as on February 2003 was recorded at 27.4m below ground
level (bgl).
The cost of the entire rainwater harvesting system was Rs 4.0
lakh.
IMPACT
Water level data
This project showed it was possible to arrest declining
water levels through rainwater harvesting. The water level in
Ashram was 35.2m below ground level (bgl) in April 2003. Concerned
with the plunging water levels in the area, Mother's International
School decided to adopt rainwater harvesting in the school and
also throughout the entire ashram. The water level recorded
in July 2003 was 33.0m (bgl), representing a net rise of 2.2m,
or 7.21 feet.
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