|
TIHAR JAIL'S RAINWATER HARVESTING
SYSTEM
|
RAINWATER AVAILABLE FOR HARVESTING
Total area (Ward 1 and Ward 13): 4125 square meters
(Sq m)
Average annual rainfall in Delhi: 611 millimeters (mm)
Total volume of water harvested: 1280 cubic meter (m³)
or 12,80,000 litres
This represents 50.78 per cent of total rainwater harvesting
potential.
WATER SUPPLY SOURCE
Water supply in these wards is fulfilled by two borewells
located inside the jail premises.
RAINWATER HARVESTING SYSTEM
Rooftop rainwater and runoff from unpaved areas:
Ward 1
In Ward 1, the rooftop rainwater from the barracks and the
surface runoff from the unpaved area are collected in a low-lying
area between the buildings. This water is collected by a collection
chamber measuring 0.5m x 0.5m x 0.5m, which is covered by
a perforated RCC slab. The water collected in the chamber
is diverted to recharge well measuring 1m x 1m x 2m with a
recharge bore of 150mm diameter and 10m deep. The recharge
well is filled with layers of pebbles and coarse sand, which
act as filtering media to improve the quality of the water
harvested.
Ward 13
The rooftop rainwater from the buildings and the surface runoff
from the open areas are collected in a low-lying area located
at southwest corner of the ward. This water is collected in
a collection chamber measuring 0.5m x 0.5m x 0.5m, which is
covered by a perforated RCC slab. The water collected in the
chamber is diverted to a recharge well measuring 1m x 1m x
2m in size with a recharge bore of 150mm diameter and 10m
deep. The recharge well is filled with layers of pebbles and
coarse sand, which act as filtering media to improve the quality
of the water harvested.
The implementation was completed in November 2002 and the
water level on February 2003 was recorded at 9.40m below ground
level (bgl).
The cost of the entire rainwater harvesting system was Rs
0.2 lakh
IMPACT
Water level data
Thsi project demonstrated that rainwater harvesting can help
solve the problem of water logging. Tihar Jail's barracks
used to remain flooded for hours after every rainfall. The
water level in the jail was 14m below ground level (bgl) in
April 2003. Concerned with flooding in the barracks and with
sharply declining water levels in the area, the Tihar Jail
authorities decided adopt rainwater harvesting in Central
Jail No. 4.
Water
Level 2006
Top...
Water
Level 2005
Top...
Water
Quality 2005
For details:
Mr.Subhash
Sharma
Deputy Jail Superintendent
Central Jail No 4, Tihar Jail
New Delhi
Telephone: (011) 25553404, 25555305, 25508755, 25551589;
Mobile: 9810157115
|
NATIONAL
