2. Rain Water Harvesting?.
• Rain Water Harvesting RWH- process of collecting,
conveying & storing water from rainfall in an area – for
beneficial use.
• Storage – in tanks, reservoirs, underground storage-
groundwater
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Why Rainwater Harvesting?
Conserve and supplement existing water resources
Available for capture and storage in most global locations
Potentially provide improved quality of water
Supply water at one of the lowest costs possible for a
supplemental supply source.
Capturing and directing storm water (run-off) and beneficially
use it
Commitment as a corporate citizen - showcasing
environmental concerns
Public Mandate (India)
Replenishing local ground water aquifers where lowering of
water tables has occured
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Percolation Pit
To divert rainwater into an
aquifer,
The percolation pit is covered
with a perforated concrete slab
The pit is filled with gravel/
pebbles followed by river sand
for better percolation.
The top layer of sand must be
cleaned and replaced at least
once in two years to remove
settled silt for improving the
percolation
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Ground Water Recharge
Under natural conditions it may take days to centuries to recharge ground water
by rain water. As we need to replenish the pumped water, Artificial Recharge of
Ground water is required at some locations.
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Recharge Wells
The runoff water from rooftops or other
catchments can be channelized into an
existing /new well via sand filter to filter
turbidity and other pollutants
Abandoned wells can also be used
Cost-effective process, which not only
conserves rainwater for immediate use
but also helps to enhance the local
ground water situation
