VASANT KUNJ  
Technology Urban
AT A GLANCE
SEE ALSO
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I.SUB SURFACE GEOLOGY

In the Vasant Kunj area the first Layer of clay and kankar extends to depth of 12m bgl. This is followed by layer of kankar and silt from 12 to 25m below ground level. This is again underlain by layer of clay and kankar which extends even beyond 40m bgl.

II.WATER LEVEL

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A comparative study of water level map of 1960 and 2002 shows in Vasant Kunj the water level which was at 5 to 10m below ground level has gone down to 20 to 30 mts below ground water level.
















III.WATER QUALITY

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In Vasant kunj fresh water occurs at all depths.


















IV.CASE STUDIES
INDIAN SPINAL INJURY CENTRE

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RAINWATER AVAILABLE FOR HARVESTING

Total area - 52,598 square metres (Sq m)

Average annual rainfall in Delhi - 611 millimetre (mm)

Total volume of water harvested - 27,317 cubic metre (m³) or 273,17,000 litres

This represents 85 per cent of the total rainwater harvesting potential.

WATER SUPPLY SOURCE

The Centre's water requirements are met by four borewells located on the hospital premises.

RAINWATER HARVESTING SYSTEM
Hospital building: The rooftop rainwater and the surface runoff from the western part of the building are drained into a stormwater drain that runs to the west side of the building. This water is diverted into a recharge well located at the northwest corner of the campus near an existing borewell. A part of the rooftop rainwater from the east side of the hospital building and runoff from the paved area are diverted through a network of pipes and collection chambers to another stormwater drain that runs to the north of the premises. This runoff is also diverted to the same recharge well located near the borewell. This recharge well is 2.75m in length and 2.13m in breadth and is 1.82m deep. This recharge well is provided with a recharge bore of 100mm diameter and is 20m deep. This recharge well has two compartments, and the runoff water undergoes two stages of filtering before it enters the recharge borewell. Layers of brickbats and sand ensure the quality of water used for recharging purposes.Staff quarters area: The rooftop rainwater and the surface runoff from the paved and unpaved areas are collected in chambers interlinked by pipes. This water is used for recharge purposes by diverting it to two recharge wells. Part of this water is diverted to recharge the east side of the staff quarters and the rest is harvested by converting a dry borewell into recharge well near the entrance of staff quarters. These recharge wells are measure 1.5m in diameter and are 2m deep; the recharge borewell measures 20 meters. The implementation was completed on October 2002 and the water level on February 2003 was measured at 32m below ground level (bgl).The cost of the entire rainwater harvesting system was Rs 0.80 lakh.



V.RECOMMENDATION FOR AUGMENTATION OF GROUNDWATER

In this area the rainwater can be diverted to a depth of 15 to 20mts. By doing this the rainwater will under go a natural filtration in the subsoil before it reaches the main aquifer. The recharge bore in the recharge well should be of 15 to 20mts bgl.


 

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