DEFENCE COLONY RAINWATER HARVESTING
RAINWATER AVAILABLE FOR HARVESTING
Total rooftop and surface area: 26,087 square metres (sq m)
Average annual rainfall in Delhi: 61
1.8 millimetres (mm)
Total volume of rainwater harvested: 9,563 cubic metres (m3)
or 95,63,494 litres
Therefore, 60 per cent of the total rooftop and surface runoff
is being harvested.
WATER SUPPLY SOURCE
The water requirement is fulfilled by private bore wells located
in the back lane of houses and is supplemented by municipal
RAINWATER HARVESTING SYSTEM OF CHAKARVARTY VITHI AND CHANDAN
VITHI LANES IN C BLOCK
Rooftop rainwater harvesting: Rainwater from the rooftop and
surface runoff from the paved area of the houses is flown
into the storm water drain that runs on both sides of the
main lane. Rainwater from the storm drain is diverted into
recharge wells constructed along the drain at strategic locations.
Initially the drains were cleaned thoroughly and with the
help of one foot baffle wall, that also helps in arresting
the heavysilt, rainwater is diverted to recharge wells.
The recharge wells are 1.5 m x 1 m x 2 m in size and are provided
with recharge bores of 150 mm and 17 m depth. The wells are
also filled up with layers of boulders, pebbles and coarse
sand to ensure efficient filtration.
19 recharge wells have been constructed in the main lane and
back lanes of the Chakarvarti Vithi and Chandan Vithi at different
The implementation was completed in December 2003 and the
groundwater level, as in February 2004, was around20 m below
ground level (bgl).
The total cost incurred: Rs 2.58 lakhs
Ms Neeta Anand
C-486, Defence colony,