Ground water is one of the important sources of water in urban areas. With increasing urbanization, underground water has been indiscriminately exploited, causing depletion in water table and water availability. It is very evident from the number of failing borewells/Open wells that it is unsustainable to pump out water from wells without recharging the same from the rain water. To reverse the trend or to reduce the effect of over exploitation, ground water recharge needs to be taken up on a large scale at residential and institutional buildings.
There are many methods of ground water recharge. Following are few methods for recharging groundwater using rain water from rooftop of buildings and other sources: