These industries require water for following or the other reasons: Thermal power plants also requires large volume of water for the purpose of cooling and disposal of fly ash. Water is used for various important purposes: Water plays the most important role in agriculture. The main waterways exist in the Ganga in the eastern region and Brahmaputra in the north-eastern region, which account for more than 65 per cent of the traffic. Fish, wildlife and recreation facilities play an important role in nation’s life and adequate water supplies for their continued development and important. Agriculture is impossible without irrigation throughout the crop season. Transport by water ways is cheaper as compared to by road and railway. Irrigation ensures proper plant growth. Lifestyle of the inhabitants and their economic conditions affect the water use within the home in different parts of the country.
Demand includes water for domestic purposes, commercial uses, street washing, lawn and garden irrigation, fire protection. Water in the domestic sector is generally used for drinking, washing toilets, lawn sprinkling, and food preparation etc. Water is not only important for human beings but also plays an important role to balance the entire ecosystem by various ways: Water is used in huge quantities in the industries like steel industry, chemicals, fertilizers, textiles, cement, electricity, petrochemicals and paper.
Water is used in thermal power generation. Water ways are important medium of transportation. Mining, food etc.