Underground water can be recharged by rain water harvesting. The technique to capture and store rain water for future use by making special water harvesting structures is called rain water harvesting. There are two ways of rainwater harvesting: Surface run off where rain water that flows away from the surface can be collected and used. Rooftop rainwater harvesting is the technique where rain water from roof tops of the buildings is collected through canals and drains the water to the ground reservoir. This stored water can be used in future.
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