At
the micro - level, our annual rainfall of 120 cm,
if harvested within Chennai city, extending over
an area of 174 sq. kms, is capable of yielding 125
litres per day, making us self sufficient.
At the micro-level, this amount of rainfall is capable
of yielding more than 700 litres of water per day
this will not only take care of the daily needs
of a family with 5 members but this will also reduce
their dependence on metro waterthroughout
the year, if harvested in one ground of plot (2400
sq. ft).
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Calculator
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Rainater Harvesting