words per minute
9
PushpendraSingh5434
00:00
Speed
The main occupation of the people in our country is farming. We
depend on rainwater to grow crops. It does not rain regularly throughout
the year. We do not receive the same amount of rainfall in all parts of the
country.
Thus we cannot depend only upon rainfall to grow our crops. We
must make other arrangements to water the fields at the proper time.
Irrigation is one of the important ways to do it. Canals, wells and tanks are
three important means of irrigation. Today, India has one of the largest
irrigation systems in the world.
The canal is the most important source of irrigation in India.
Channels are dug to build canals. River-water is diverted into these canals.
The canals can take river-water to the far-off fields, where there is not
enough water. At some places, the river-water has to be stored. We can
build a barrier of cement and steel to block the flow of river-water. This is
called a dam. A huge lake is created behind the dam. The water from the
lake can regulate the flow of water in the river. The water from such lakes
can also be diverted to the canals for irrigation. Punjab, Haryana, West
Bengal and Tamil Nadu have a good network of canals.
Dams also help in the production of electricity. When water from the
lake behind the dam is made to fall from a high point, it is used to turn
turbines which produce electricity. The dam also helps to control floods in
the river. A project which helps to provide water for irrigation, produces
electricity and controls floods in the river is called a multipurpose project.
our government has built a number of multipurpose projects. Some
of them are shown on the map. Find out the names of the others dams and
the rivers they are built on. When it rains, some water seeps through the
soil and goes deep into the ground. We can reach this underground water
through wells. Where the water is not too deep, we normally use the
Persian wheel to draw out this water. Deep tube wells have to be bored
when the water is at a great depth.