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Groundwater recharge is the simplest way to augment the quality and quantity of groundwater. It is a simple way to channelize the rainwater into the aquifer. It is an absolute necessity in the context of rapid urbanization. Recharging also helps in reducing floods and improving the quality of groundwater. A recharge well is essentially a hole in the ground. Rainwater run-off from roofs, paved and unpaved surfaces is de-silted and channelized into the ground. Trivia : In the city of Bangalore alone, 3,000 million liters of water falls daily as rain during the monsoon. This works out to approximately 3.5 million liters of water per acre per year. If we recharge about 30% of the water that falls over the city, we can have more water than what the river Cauvery is supplying to the city!!.