Transcript RAINWATER HARVESTING

RAINWATER HARVESTING
WHAT IS RAINWATER HARVESTING ?
• Rainwater harvesting is the accumulating and storing of
rainwater for reuse before it reaches the aquifer. It has
been used to provide drinking water, water for livestock,
water for irrigation, as well as other typical uses. It ALSO
means capturing rain where it falls or capturing the run off
in your own village or town. And taking measures to keep
that water clean by not allowing polluting activities to take
place in the catchment.
DIFFERENT TYPES OF RAINWATER
HARVESTING IN INDIA
• Tankas
Tankas (small tank) are underground tanks, found traditionally in
most Bikaner houses.
• Khadin
A khadin, also called a dhora, is an ingenious construction designed
to harvest surface runoff water for agriculture. Its main feature is a
very long (100-300 m).
• Vav / vavdi / Baoli / Bavadi
Traditional stepwells are called vav or vavadi in Gujarat, or baolis or
bavadis in Rajasthan and northern India
• Ahar Pynes
This traditional floodwater harvesting system is indigenous to south
Bihar.
• Zings
Zings are water harvesting structures found in Ladakh. They are small
tanks, in which collects melted glacier water.
RAINWATER HARVESTING OUTSIDE INDIA
• Currently in China and Brazil, rooftop rainwater harvesting is being practiced for
providing drinking water, domestic water, water for livestock, water for small
irrigation and a way to replenish ground water levels.
• In Bermuda, the law requires all new construction to include rainwater harvesting
adequate for the residents. The U.S. Virgin Islands have a similar law.
• In the United Kingdom water butts are often found in domestic gardens to collect
rainwater which is then used to water the garden. However, the British
government's Code For Sustainable Homes encourages fitting large underground
tanks to new-build homes to collect rainwater for flushing toilets, washing clothes,
watering the garden and washing cars. This reduces by 50% the amount of mains
water used by the home
• In Beijing, some housing societies are now adding rain water in their main water
sources after proper treatment.
• In Australia rainwater harvesting is typically used to supplement the
reticulated mains supply. In south east Queensland, households that
harvested rainwater doubled each year from 2005 to 2008, reaching 40%
penetration at that time
METHODS OF RAINWATER HARVESTING
TRADITIONAL METHODS
• Kunds of the Thar Desert- In one of the driest places on
earth civilization thrived due to systems that harvested rain
water for use all year round.
• Bamboo Drip Irrigation of the Northeastern Hills-The
Northeastern Hill region has a unique system of drip
irrigation that harvests rainwater using bamboo pipes.
• Kul Irrigation of the Trans-Himalaya-Despite receiving little
rainfall because of being in the Himalayan rain shadow, the
people of the Spiti valley have made use of melting glacier
water to feed their agricultural needs.
TRADITIONAL METHODS PICS
Kul Irrigation of the Trans-Himalaya
MODERN WAY OF RAINWATER
HARVESTING
• Groundwater Dams-A good way to harvest
rainwater. See the detailed instructions and
diagrams
• Rashtrapati Bhavan-A look at the system employed
by the President of India to harvest rainwater on
the Rastrapati Bhavan grounds. This is one of the
largest rainwater harvesting systems in the world.
• Ferrocement Tanks-A low cost solution to storing
harvested water that is easy and efficient. It uses
simple materials and can be adapted to any region
and for any purpose.
MODERN METHODS PICS
Rashtrapati Bhavan H A RV EST I N G
SYST E M
BENEFITS OF RAINWATER HARVESTING
• By capturing water directly, we can significantly reduce our reliance
on water storage dams. This places less stress on these water
storages and can potentially reduce the need to expand these dams
or build new ones. Collecting and using your own water can also
significantly reduce your water bills. By capturing water, the flow of
storm water is also reduced and this minimises the likelihood of
overloading the storm water systems in our neighbourhoods.
• drinking, cooking, bathing (potable quality)
• swimming pool replenishment
• toilet flushing
• laundry (reduces detergent & bleach)
• landscape irrigation
• livestock & animals
PICS OF BENEFITS OF RAINWATER
HARVESTING