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Rain water harvesting has regained its importance as a valuable alternative or supplementary water resource, along with more conventional water supply technologies. Water shortages can be relieved if rainwater harvesting is practiced more widely.  People collect and store rainwater in buckets, tanks, ponds and wells. This is commonly referred to as rainwater and has been practiced for centuries. Rainwater can be used for multiple purposes ranging from irrigating crops to washing, cooking and drinking.  Rainwater harvesting is a simple low-cost technique that requires minimum specific expertise or knowledge and offers many benefits. Rainwater harvesting is one of the alternative technologies for delivering drinking water.  In fact, through the ages, this has been a traditional way of enhancing domestic water supply. Rainwater harvesting systems are viable options both for storing water for domestic use and for recharging groundwater aquifers. In this context the present paper is focus on “The Impact of Rain Water Harvesting System in Kerala with special reference to Palakkad district”.

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