The P-4 Partners
Community Partner: NARMADA APARTMENTS WELFARE ASSOCIATION
Funding Partner: COCA-COLA INDIA
Expert Advice: CENTRAL GROUNDWATER BOARD
Government Support: DELHI JAL BOARD, MUNICIPAL CORPORATION OF DELHI
Narmada Apartments is a locality in South district of Delhi. Due to the overexploitation of the groundwater reserves the water table has been depleting at a rate of more than 1 meter a year. To protect the groundwater reserves from further depletion, the Central Groundwater Authority (CGWA) notified this district in 2000. i.e. no bore wells could be made without permission.
Narmada Apartments also receives less water from the treated water distribution network of Delhi Jal Board. As a result, the area frequently suffers from a severe shortfall in water supply. Water tankers (private and DJB) are frequently called upon by residents to fulfill even their basic water requirements. The water table stands at 60 m. below ground level.
It is very important therefore, to do Rainwater Harvesting in this area so that the groundwater levels are maintained. Recharge trenches with bore wells which join the aquifer at the water table will do effective recharge to groundwater.
Narmada Apartments is a planned colony with a well laid out storm water drainage network that is functional at most points. Based on the direction of flow of water in the storm water drains, flow on the road surface and availability of construction space, many sites have been identified for construction of rainwater harvesting structures.
Of these, 1 site has been selected for the current project. This site is situated at a point along the storm water drain where it gathers maximum runoff from the colony.
Recharge trench of size 8 m X 2 m X 3 m with 2 recharge wells of depth 40 m for groundwater recharge will be constructed at all this site.
TECHNICAL DETAILS OF RAINWATER HARVESTING PROJECT
Watershed details –
Average Annual Rainfall 611 mm / yr
Land use type Urban, Residential
Total area considered for recharge 10000 sq.m.
Geological and hydro-geological details -
Geological formation Weathered and fractured quartzite
Depth to water table 40-45 m below ground level
Water Available for recharge 4,000 cu.m. approx.
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