Download - Rain water harvesting
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RAIN WATER HARVESTING
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It is a technique of increasing the recharge of ground water by capturing and storing rain water in specially constructed structures.
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Objectives:•To reduce of run-off loss & to avoid flooding.•To meet the increasing demand of water.•To raise water table by recharging ground water.•To reduce ground water contamination.•To supplement ground water supplies during lean season.•To prevent salinity.
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Modern Techniques 1.Roof top Rain water harvesting2. Artificial ground water recharching3. Check Dams4. Embankment type water5. Underground tanks and Khadins(embankments)
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Rain Water Harvesting in different Cities
1. In Amritsar (Punjab) - Golden Temple2. In JNU, Delhi campusthe water table has risen
from 0.8to 1.0 m after recharged through four check dams
3. In IIT, Delhi, water table raised by 3 to 4 m through roof for harvesting & recharge through two injection wells.
4. In Maharashtra, more than 7000 percolation tanks built after severe drought hit areas into green lands
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5. In M.P more than 1000 check dams & 1050 tanks constructed in jhabua district.(It inc food production by 38% in last 5 years.6. In Jodhpur district (Rajasthan), Gramin vikas Samity motivated residents of 25 villages & built 2000 storage tanks. (Tanks are lined with alum & Lime, which keep stored water fresh for 4 months)
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ADVANTAGES OF RAIN WATER HARVESTING1. Rise in water table by recharging the aquifers.2. Improves ground water quality by dilution.3. Reduces soil erosion by minimizing run-off
water.4. Mitigating the effects of drought &flood hazards.5. Reduction in use of energy for pumping water &
consequently the costs6. Assures sustainability of ground water
abstraction sources.
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