Average annual rainfall in Gurgaon - 577.8 millimetre (mm)
Total volume of water harvested - 23549.32 cubic metre (m³)
or 2,35,49,320 litres
This represents 45.8 per cent of the total rainwater harvesting
potential.
WATER SUPPLY SOURCE
The four borewells inside the colony provide around 5.5 lakh
litres of water every day.
RAINWATER HARVESTING SYSTEM
Rooftop rainwater harvesting:
Rooftop rainwater from the MA 1/2 block is diverted into a recharge
well through a series of chambers and interconnected pipes.
This recharge well measures 2.5m x 1.25m x 3.5m in dimension
with two recharge bores, each 150mm in diameter and 20m deep.
The recharge well is filled with three layers of pebbles ranging
from 10mm to 100mm in size, which act as filtering media.
Surface runoff harvesting:
The rooftop rainwater and surface runoff from the paved and
unpaved areas in the colony are collected in a series of interconnected
collection chambers. This water is harvested by converting the
116 collection chambers into percolation pits by drilling a
recharge bore of 100mm diameter and 15m deep. The quality of
runoff water through these recharge bores is ensured through
a filter media.
The implementation was completed on July 2001, and the water
level on February 2003 was recorded at 39.6 m below ground level
(bgl).
The cost of the entire rainwater harvesting system was Rs 5.9
lakh.
IMPACT
Water level data
This project showed it was possible to minimise water logging
in colonies through rainwater harvesting. The roads of Garden
Estate became waterlogged even after a short shower. The water
level was recorded at 39.6m below ground level (bgl) in April
2003. Concerned with declining water tables and water logging,
the Garden Estate Resident Welfare Association decided to adopt
rainwater harvesting throughout the colony. After the successful
implementation, the problem of water logging has been solved
and the water level recorded in July 2003 was 37.9m (bgl), showing
a net rise of 1.7m, or 5.57 feet.
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