Ground water will not be depleted due to

Approximately what percentage of groundwater do we utilize?

Khadins,Bundhis,Ahars and Kattas are ancient structures that are examples for

Compare the advantages of groundwater over water available from sources on the surface of the earth.

In our country,there are attempts to increase the height of several existing dams like Tehri and Almati,dams across Narmada. Choose the correct statements among the following that are a consequence of raising the height of dams:
$(i)$ Terrestrial flora and fauna of the area is destroyed completely.
$(ii)$ Dislocation of people and domestic animals living in the area.
$(iii)$ Valuable agricultural land may be permanently lost.
$(iv)$ It will generate permanent employment for people.

Mention any two reasons for the failure to sustain underground water.