LODHI ROAD  
Technology Urban
AT A GLANCE
SEE ALSO
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I.SUB SURFACE GEOLOGY

I
n the Lodi road area the first Layer of clay and kankar extends to depth of 8m bgl. This is followed by kankar and silt upto 20m, this layer is again underlain by clay and kankar upto 50m bgl.

II.WATER LEVEL

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A comparative study of water level map of 1960 and 2002 shows in Lodi road the water level which was at 5 to 10m below ground level has gone down to 10 to 15 mts below ground water level.

















III.WATER QUALITY


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In Lodi road fresh water occurs in shallow zones.















IV.CASE STUDIES
FORD FOUNDATION

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RAINWATER AVAILABLE FOR HARVESTING Total area - 12,500 square metres (Sq m)

Average annual rainfall in Delhi - 611 millimetre (mm)
Total volume of water harvested - 6491.8 cubic metre (m³) or 64,91,875 litres This is 85 per cent of total rainwater harvesting potential.

WATER SUPPLY SOURCE
The organisation's water requirement is fulfilled by two tubewells and is supplemented by Municipal water supply. Approximately 15,000 litres of water is used for potable and non-potable purposes.

RAINWATER HARVESTING SYSTEM

Rooftop rainwater and runoff water from paved and unpaved areas: The rooftop rainwater from the northern portion of the UNDP building is diverted to a recharge well located near the existing borewell through a network of pipes and collection chambers. The recharge well is 2m in diameter and 3.5 m deep, with a recharge bore which is 100mm in diameter and 5m deep. The rooftop rainwater runoff from the southern part of the UNDP building is collected in a chamber and diverted to a 1m x 1m x 1m recharge well with a recharge bore of 100mm diameter and 5m deep. A layer of pebbles and sand filled inside the recharge well acts as filtering media, ensuring the quality of water being recharged.

Surface water harvesting:
Surface runoff from paved and unpaved sources and part of the rooftop rainwater are trapped by constructing recharge troughs near Gates I, III, V and VI. These troughs are 5m long, 0.7m wide and 1.5m deep. Each trough is provided with recharge bores that are 100mm in diameter and 5m deep. Implementation of the system was completed on November 2000 and the water level on February 2003 was recorded at 9.80m below ground level (bgl).The cost of the entire rainwater harvesting system was Rs 4 lakh.

V.RECOMMENDATION FOR AUGMENTATION OF GROUNDWATER

I
n this area shallow recharge wells can be constructed. The non potable water from the subsurface formation can be used for non potable water.



 

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