Rain water harvesting
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Rain water harvesting






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Rain water harvesting Rain water harvesting Presentation Transcript

  • R AIN WATER H ARVESTING(i)(ii)(iii)(iv)
  • W HAT IS WATER HARVESTING ?  It is the method by which rain water is collected for later use .
  • U SES OF RAIN WATER HARVESTING  Its used to maintain the underground water table.It is also called ground water recharge(In the picture)  Since rain water is stored for later use , it can be used at times of drought.  It reduces soil erosion as the running water is stored (to a certain extent).
  • T ECHNIQUES OF RAIN WATER HARVESTING The most basic type of rain water harvesting is the method by which the water sliding down the roof tops is collected by a gutter which goes down the pipes to be stored . Sometimes the water is let into the soil to maintain the water table. In US the rooftop rain water is collected in a sump. A subsurface dyke is built in an aquifer to obstruct the natural flow of groundwater, thereby raising the groundwater level and increasing the amount of water stored in the aquifer.
  •  In largely level terrain , the water harvesting structures are mainly crescent shaped earthen embankments or low straight concrete-and-rubble “check dams” built across seasonally flooded gullies . Monsoon rains fill ponds behind the structure .
  • WATER HARVESTING IN DIFFERENT PARTS OF THE WORLD In China and Brazil rooftop rain water harvesting is practiced for providing drinking water , water for irrigation , for livestock and to maintain the water table. In Bermuda and US all new buildings includes water harvesting sufficient for the residents. In UK rain water (water butts) tanks are used for rain water harvesting In Australia rainwater harvesting is typically used to supplement the reticulated mains supply. In south east Queensland, households that harvested rainwater doubled each year from 2005 to 2008, reaching 40% penetration at that time (White, 2009 (PhD)).
  •  In Senegal and Guinea-Bissau, the houses of people are frequently equipped with homebrew rainwater harvesters made from local, organic materials. In the Irrawaddy Delta of Myanmar, the groundwater is saline and communities rely on mud-lined rainwater ponds to meet their drinking water needs throughout the dry season. Some of these ponds are centuries old and are treated with great reverence and respect. In India : (i) Khandins and Nadis in Rajastan (ii)Bandhara and Tals in Maharashtra (iii)Bhundin in MadhyaPradesh and UttarPradesh
  • (iv) Ahars and Pynes in Bihar(v) Eris (tanks) in Tamil Nadu(vi) Surangams in Kerala(vii)Khattas in Karnataka