Question

there are 10 tube Wells in a lane of 50 houses what could be the long term impact on the water table? What is rainwater harvesting?

Answer 1

If this happens then the the people of the fifty houses use the ten tube wells, then the water required by them is drawn from the ground. If these tube wells are used for long time, then the ground water would be reduced and the water table would go down.
The rainwater harvesting is
a method used to conserve water at the ground level for future use.

Answer 2

if the people of 50 houses used to 10 tube well then the water required by them is thrown from the ground if if you're well as used for long time then be ground water is supplied directly to the base of the plants using narrow p i p e s thereby reducing the loss of water