Water
resource is important on Earth and without it we can’t do many things or satisfied
our needs. We would have to take care of the water because in few years there's
not going to be enough water for us. Water is a renewable natural resources
also like air and soil. Water resources are divisible into two
distinct
categories : the surface-water resources and the ground-water resources. Each
of these
categories
is a part of the earth's water circulatory system, called the hydrologic cycle,
and is derived from precipitation, which is rainfall plus snow. 97% of the water on the Earth is salt water.
Only three percent is fresh water; slightly over two thirds of this is frozen
in glaciers and polar ice caps. The remaining unfrozen freshwater is found
mainly as groundwater, with only a small fraction present above ground or in
the air.
Importance of water resource
Agricultural
It is
estimated that 69% of water use is for irrigation, with 15-35% of irrigation
withdrawals being unsustainable. Aquaculture is a small but growing
agricultural use of water.
Industrial
It is estimated
that 15% of water use is industrial. The distribution of industrial water usage
that is varies widely, but as a whole is lower than agricultural use.
Recreational
water
use is
usually a very small but growing percentage of total water use. Recreational
water use is mostly tied to reservoirs.
Household
It is estimated
that 15% of water use is for household purposes. These include drinking water,
bathing, cooking, sanitation, and gardening
Environmental
Explicit
environmental water use is also a very small but growing percentage of total
water use.
Navigation
At present Bangladesh has 7672 km water ways
and water ways used as transportation thus it is vital for navigation system
Hydro
electricity
Producing electricity by using water power is
very much cost effective
