It is through cracks in the hard rock almost 100 feet below water is drawn to the
surface through borewells. Some very deep borewells exist in Bangalore. In
order to lift the water from such a depth, more energy is required.
Increasing
number of places are being paved, built up, and having roads constructed on
them. This prevents water from infiltrating into the ground which could be
described as 'crusting' at the top.
There
are two plain methods of recharging the borewells. One is the surface spreading
technique in which water is accumulated in tanks or ponds or lakes and this
slowly infiltrates into underground where it finally reaches the borewells.
Another method is knows as the point recharge technique and it is more useful
for apartments and individual homes. Rooftop rainwater or surface water is
accumulated and made to sink-in near the borewell through recharged wells.
Perforations are sometimes made in the casing of the borewell so that the water
gets into the casing to reach the cracks from where water is being drawn.
If
there happen to be non-functioning borewell in any individual home, buildings,industries, institutions and apartments they must be recharged. A deed borewell
should never be closed but it should be used as a recharge structure. Only
through this and through using water judiciously can a borewell's life be
extended.
Rooftop
rainwater has the least likelihood of being contaminated so it is preferable to
recharge a borewell with this kind of water. It is also a good practice to recharge all borewells which had an abundant yield earlier but are now yielding
less or those which had some yield but have now run dry. There is no need to
recharge a borewell which is already yielding well.
If
you have a yielding borewell it is a good idea and also safer to make a
recharge well which has a diameter of about 3 feet and is of 20 feet depth a
few feet away from the borewell so that rooftop rainwater percolates into the
recharged well.
No comments:
Post a Comment