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Rain water collected on the roof is not allowed to go into the drain. It is allowed to percolate under the ground by a specially made passage so as to recharge the ground-water. This process is called rain water harvesting. Advantages of rain water harvesting:

• Rain water stored as underground water does not evaporate.

• The water stored in ground does not promote breeding of mosquitoes.

• It is protected from contamination by human and animal waste.

• This water recharges wells.