2. RAIN WATER HARVESTING
Rain water harvesting is a
technology used fortechnology used for
collecting and storing rain
water from roof tops, the
land surface or rock
catchments using simple
techniques such as jars &
pots as well as more
complex techniques such as
underground check tanks.
Rain water harvesting is
the accumulation and
deposition of rain water for
reuse on-site, rather than
allowing it to run-off.
3. Uses of Rain Water
Recharge underground waterRecharge underground water
Gardening
Livestock
Drinking purpose
For irrigation purpose, etc.
4. ADVANTAGES
Conserve & supplement existing water
resources.
Available for capture and storage inAvailable 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
(runoff) & beneficially use it.
Commitment as a corporate citizen-Commitment as a corporate citizen-
showcasing environmental concerns.
Public mandate(India).
Replenishing local ground water,
aquifers where lowering of water tables
has occured.
5. How can we harvest Rainwater
Broadly there are two ways
of rainwater harvesting-
Surface runoff
harvesting
Roof top rainwater
harvesting
6. In urban area
Surface Run-off Harvesting
In urban area
rainwater flows away
as surface runoff.
This runoff could be
caught and used for
recharging aquifiers
by adopting
appropriateappropriate
methods.
7. Roof top Rainwater Harvesting
It is a system of catching
rainwater where it falls.
In rooftop harvesting, the
roof becomes the
catchments, and the
rainwater is collected from
the roof of the
house/building. This methodhouse/building. This method
is less expansive and very
effective.
8. Components of the roof top
rainwater harvesting systemrainwater harvesting system
Catchment area
Transportation
First flush
Storage system
Delivery system Delivery system
Filtration system
9. Recharging ground water aquifers
Commonly used recharging
methods are-
Recharging of bore wells
Recharging of dug wells
Recharge pits
Recharge trenches
Percolation tanks
10. Principles of RWH
System of rainwater
harvesting is helpful forharvesting is helpful for
achieving the following-
25% portable water
reduction
100% portable water
provided by rain
50% reduction of sewer 50% reduction of sewer
quantities
11. ‘LIFE DEPENDS ON WATER AND WATER
DEPENDS ON YOU SO SAVE WATER ANDDEPENDS ON YOU SO SAVE WATER AND
DON’T LET IT TO DRAIN’
THANK-YOUTHANK-YOU