Rainwater harvesting is a technique of collecting and storing rainwater for future use. It is a traditional method of storing rain water in underground tanks, ponds, lakes, check dams and used in future. The main purpose of rain water harvesting is to make the rainwater percolate under the ground so as to recharge ‘ groundwater level’.
Methods of rainwater harvesting
Roof top rainwater harvesting: Roof tops are excellent rain catchers. The rain water that falls on the roof of the houses, apartments, commerical buildings etc. Is collected and stored in the surface tank and can be used for domestic purpose.
Recharge pit: In this method, the rain water is first collected from the roof tops or open spaces and is directed into the percolation pits through pipes for filtration. After filtration the rain water enters the recharge pits or ground wells.
People living in rural areas adopt a variety of water collecting methods to capture and store as rain water. Some of the methods used are 1) Digging of tanks or lakes ( Eris): It is one of the traditional water harvesting system in Tamil Nadu. Eris are constructed in such a way that if the water in one eri overflows, it automatically gets diverted to the eri of the next village, as these Eris are interconnected
Ooranis: These are small ponds to collect rainwater. The wao is used fo various domestic purpose ( drinking, washing and bathing). These ponds cater the nearby villages.
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