Rooftop rainwater harvesting is a technique to recharge:

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Sea water

Ground water

Lake water

River water

answer is B.

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Detailed Solution

Rooftop rainwater harvesting is a technique to recharge groundwater.
It is a method of collecting rainwater from roof catchments and storing it in reservoirs. Rainwater can be collected and stored in subsurface groundwater reservoirs using artificial recharge techniques to suit residential tank requirements. The primary goal of rooftop rainwater collection is to save water for later use. In dryland, hilly, urban, and coastal environments, capturing and storing rainwater for help is very crucial. Rooftop rainwater collection is an effective practice in Rajasthan for storing drinking water. Tamil Nadu is the first state in India to require all homes in the state to have a rooftop rainwater collection system.

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