Simplest way to recharge ...

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Simplest way to recharge ground water is to collect rainwater in natural depressions/low lying areas/ natural lakes and allowing it to seep into ground acquifers naturally. Percolation rate into acquifer can be increased suitably by providing vertical pipes between bottom of water collection chambers or lake upto top of suitable percolation strata.A suitable filter will have to be provided at top of  each such vertical pipe to ensure ground water is filtered before water enters vertical downtake  pipe. Details of recharge pits are available in literature on the subject.