Lesson 3: Water resources


Water is a very important natural resource. The water cycle, through evaporation and precipitation, maintains hydrological systems which form rivers and lakes and supports a variety of aquatic ecosystems. Water covers 70% of the Earth’s surface, but only 3% of this is fresh water. Of this, 2% is present as polar ice caps and only 1% is usable water in rivers, lakes and subsoil aquifers. At a global level, 70% of the water is used for agriculture, about 25% for industry, and only 5% for domestic use. India uses 90% of its water for agriculture, 7% for industry, and 3% for domestic use. March 22nd is World water Day.

Uses of water

  • Water is the raw material in the process of photosynthesis of green plants.

  • It protects from dehydration of all terrestrial life.

  • It influences global ecology, i.e., weather, global climate; flora and fauna.

  • Water is linked with social, economic, political and ecological intricacies.

  • Water is required for several purposes such as drinking, bathing, washing, agricultural production, and industrial production, generation of hydro-power, and abatement of pollution, navigation, recreation and maintenance of eco-systems

Last modified: Wednesday, 28 December 2011, 7:12 AM