About 3/4th of the earth’s surface is covered with water, but fresh water is available in a small proportion.
It is obtained from the following sources :
(a) Surface run-off
(b) Groundwater
(c) Precipitation (in the form of Rain, snow, dew, hail, etc.)
This water available in all sources is continuously being renewed and recharged through the process of hydrological cycle. Thus, water becomes a renewable resource.