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Rain water harvesting is the process of collecting or accumulating rainwater for the purpose of re-using whenever required. It is the process in which rain water in not allowed to to run off and become a waste.
The advantages of rain water harvesting are:
1. It is a secondary source of water supply when the main water source gets damaged. 
2. In some places where there is scarcity of water during summer months, this water can be used for several purposes.