Rain
water percolating into ground constitutes ground water. Water used by humans
comes mainly from land. It is now realized that there is a limit to ground
itself provides an effective filtering medium. The advantages of ground water
are:
water percolating into ground constitutes ground water. Water used by humans
comes mainly from land. It is now realized that there is a limit to ground
itself provides an effective filtering medium. The advantages of ground water
are:
1.
It
is likely to be free from pathogenic agents.
It
is likely to be free from pathogenic agents.
2.
It
is usually requires no treatment
It
is usually requires no treatment
3.
The
supply is likely to be certain even during dry season.
The
supply is likely to be certain even during dry season.
4.
It
is less subject to contamination than surface water.
It
is less subject to contamination than surface water.
Disadvantages are:
1.
It
is high in mineral content e.g. salts of calcium and magnesium which render the
water hard.
It
is high in mineral content e.g. salts of calcium and magnesium which render the
water hard.
2.
It
requires pumping or some arrangement to lift the water.
It
requires pumping or some arrangement to lift the water.
The usual ground water sources are
wells and springs. Wells have been classified into shallow and deep wells, dug
and tube wells.
wells and springs. Wells have been classified into shallow and deep wells, dug
and tube wells.
