This slide show depicts how rainwater harvesting has been accommodated in policy and legislation in India and specifically in the state of Karnataka. It gives example of projects in rural areas and in the city of Bangalore.

1. Rainwater Harvesting In India A rural and urban case study S.Vishwanath www.rainwaterclub.org www.ircsa.org www.youtube.com/zenrainman

2. In a water scarce world we need to conserve every drop of water Photo : Norma Angelica Hernandez Bernal

6. A simple traditional rainwater harvesting system

7. An above the ground rainwater 2000 litre rainwater storage tank

8. Quality check- using the H2S vial test for e.coli identification Put sample water in bottle and observe for 36 hours Brown colour indicates no e-coli, black water would indicate e-coli

9. Simple treatment for e-coli in rainwater using SODIS Keep water in a bottle for 5 hours in the sun www.sodis.ch

12. Local hydrologic cycle – seeking bio mimicry with rainwater harvesting

14. A rain barrel is the simplest way to harvest rainwater

17. Rainfall pattern in Bangalore Maximum rainfall intensity 90 mm/hour 30 years data 970.00 59.8 TOTAL 137.00 10.0 AUG 194.80 9.3 SEP 180.40 9.0 OCT 110.20 8.3 JUL 64.50 4.0 NOV 80.80 6.4 JUN 22.10 1.7 DEC 119.60 7.0 MAY 46.30 3.0 APR 4.40 0.4 MAR 7.20 0.5 FEB 2.70 0.2 JAN QUANTITY (mm) DAYS MONTH

18. EVERY ROOF IN A CITY CAN BE A CATCHMENT

19. Rainwater harvesting in an underground tank

20. A first rain separator and a sand filter

21. Harvested rainwater in underground tank

22. Site identification FOR RECHARGE with rainwater The site should have a sufficient clean and large catchment. It should also permit fast infiltration and percolation.

23. Excavation The excavation should reach porous soil / weathered rock / fracture. Digging the pit

24. Back-filling. Round hard stones Smaller stones on top Filling of the recharge pit with large stones first than small stones

25. Finished recharge pit with coarse sand filling over the small stones

26. Recharge pit around bore wells

27. The pit has reach the silt layer Pit and concrete rings Placing of the rings The making of a recharge well – to put rooftop rainwater or stormwater into the aquifer. In Bangalore city, typically 6 metres deep and 1 metre diameter

28. Recharge wells details Silt and leaves trap in a storm-water drain Covers : steel grill or perforated RCC

29. Rainwater going inside a recharge well Re-charging a bore well Outlet pipe in recharge well

31. Don’t forget the maintenance

32. Recharge wells in storm-water drains

33. A landscaped recharge well in an office

34. We need rainwater harvesting for the Blue Planet Every drop counts