Rain water harvesting
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This document discusses various methods of rainwater harvesting and artificial groundwater recharge to meet increasing water demands, raise water tables, and supplement groundwater supplies during dry seasons. These methods include rooftop rainwater harvesting, check dams, embankments, underground tanks, and khadins. Examples are given of projects using these methods in places like the Golden Temple, IIT Delhi, JNU Delhi, Maharashtra, and Jodhpur that have successfully raised local water tables and increased food production. The benefits of these methods are listed as rising water tables, improved groundwater quality, reduced soil erosion, mitigation of drought and flood hazards, lower pumping costs, and sustainable groundwater sources.
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Rain water harvesting
- 5. •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.
- 6. 1.Roof top Rain water harvesting 2. Artificial ground water recharching 3. Check Dams 4. Embankment type water 5. Underground tanks and Khadins(embankments)
- 7. 1. In Amritsar (Punjab) - Golden Temple 2. 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
- 8. 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)
- 9. 1. 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 costs 6. Assures sustainability of ground water abstraction sources.