| Techniques used in
villages for Rain Water Harvesting
Bund: It is a wall
to retain run-off water. It is used to make ponds. In Raigad district
it is built out of stone masonry because the soil is too pervious
as it allows water to seep through.
Gabions: Gabions
are bunds in which chain links are used to hold the rocks together.
This way the strength of the bunds is more than loose boulder
structure. In traditional water shed management, these structures
are used on large streams, while in Konkan, however the Gabions
are needed even on smaller streams as the boulder bunds give way
in heavy rainfall.
Re-charged Pond:
Also known as percolation pond, it holds rain water and make it
to percolate underground thereby strengthening the springs of
the wells and borewells downstream.
Cordoning of springs: This is done to extend
life of the springs. Many springs yield water till December while
others till March. After this they all dry up. In this technique,
a wall is built in front of the spring mouth so that the water
coming out of the spring is collected in the small enclosure created
by teh wall. Depending on the yield of the spring and the height
of the wall, the accumulated water exerts back pressure on the
spring. Thus the water in the spring remains in the hill for longer
time. Due to this the spring may yield, higher quantity of water,
later on.
Sub-surface wall: It is a wall built from the
base of a stream upto sand layer. It may not be visible from the
surface. This wall helps in bunding under the sand flow which
happens after winter. The walls are located in such a manner as
to benefit a well or borewells downstream.
Check dam: It is a bund on a stream. The site
for this structure has a more or less flat stream bed so that
by building a small wall, accumulated water can reach considerable
length, thereby recharging teh soil with fresh water. There is
no submergence of land.
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