DAIRY F & V UNITS RAINWATER HARVESTING SYSTEM
RAINWATER AVAILABLE FOR HARVESTING
Total rooftop and surface area: 89,370 square metres (sq m)
Average annual rainfall in Delhi: 611 millimetres (mm)
Total volume of rainwater harvested: 32,250 cubic metres (m
3 ) or 3,22,49,802 litres
Therefore, 59 per cent of the total rooftop and surface runoff
is being harvested.
WATER SUPPLY SOURCE
Four bore wells located in the premises to meet industrial
requirements and drinking water is sourced from the municipal
supply. On an average 2,50,000 litres of water is consumed
daily for potable and non-potable purposes.
RAINWATER HARVESTING SYSTEM
Rooftop rainwater harvesting: Rooftop rainwater from the administrative
block, workers amenities, engineering store and central godown
buildings is flown down to the ground and then taken to storm
water drains. The storm water
drains are intercepted at strategic locations and rainwater
is diverted into recharge wells. The recharge wells are 2.5
m x 2 m x 2 m in size and provided with recharge bores of
300 mm dia and 15 m depth to facilitate the recharge. Layers
of filtering material like boulders, pebbles and coarse sand
the recharge well ensure efficient filtration.
Dry bore well recharging: In order to make rainwater harvesting
economical three existing dry/abandoned bores are used for
groundwater in the premises. The rooftop rainwater outlets
discharge onto the roads and are channelised into storm water
drains. This water is finally diverted into the dry bore well
by converting them into recharge wells. Recharge wells are
2m x 2m x 2m and 3m x 3m x 2m in size. Slots are
provided in the casing pipe. A layer of boulders, pebbles
and coarse sand filled inside the recharge well ensures proper
filtration of harvested water.
Implementation of this project was completed in April 2004,
and the water level as in January 2005 was around 7.5 m below
ground level (bgl).
Cost of the rainwater harvesting system: Rs 4.35 lakhs.
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