(II) Recharge of ground water

The structures used for recharge of ground water are:

(a) Hand Pumps:

The water should pass through a filter bed before percolation in existing hand pumps. They are used for recharging aquifiers.

(b) Pits:

They are (1-2) m wide and 3 m deep. They are also back filled with gravels and coarse sand to aid filtration before percolation to the ground. They are used for recharging a shallow aquifer.

(c) Dug wells:

The rain water, after filtration, is put into existing dug wells for storage.

(d) Rooftop and road rop collection of rainwater:

In urban areas, these methods are very useful to recharge aquifers.