RAIN WATER HARVESTING presentation .pptx

RAIN WATER
HARVESTING
&
SOLID WASTE
MANAGEMENT
PREPARED BY
N.RISHINATH

W
HATIS RAINW
ATERHARVESTING?
⚫Rainwater harvesting is a technology used for collecting
and storing rainwater from rooftops, the land surface or
rock catchments using simple techniques such as jars and
pots as well as more complex techniques such as
underground check dams.
⚫Rainwater harvesting is the accumulation and deposition
of rainwater for reuse on-site, rather than allowing it to
runoff.

USESOFRAINW
A
TER
 Recharge undergroundwater.
 Gardening.
 Drinking purpose.
 For irrigationpurpose.

⚫Rainwater harvesting technologies are simple to install and
operate.
⚫ Local people can
be easily trained to implement such technologies, and
construction materials are also readily available.
⚫Running costs, also, are almostnegligible.
⚫Water collected from roof catchments usually is of acceptable
quality for domestic purposes.
ADV
ANTAGES

Howwecanharvestrainwater?
Broadly thereare twoways harvesting rainwater :-
• Surface runoff harvesting .
• Roof top rainwaterharvesting.

• Surface runoff harvesting:-
In urban area rainwater f lows away as surface runoff. This runoff could
be caught and used for recharging aquifers by adopting appropriate
methods.
• Roof top rainwater harvesting:-
It is a system of catching rainwaterwhere it falls. In rooftop harvesting,
the roof becomes the catchments, and the rainwater is collected from
the roof of the house/building. This method is less expensive and
veryeffective.

COM
PONENTSOFTHEROOFTOPRAINW
ATERHARVESTINGSYSTEM
.
• Catchment area
• Transportation
• Storage system
• Delivery system
• Filtration system

⚫The surface that receives rainfall directly is the
catchment of rainwater harvesting system. It
may be terrace, courtyard, or paved or unpaved
open ground.
CATCHMENTAREA

⚫Rainwater from rooftop should be carried down
through water pipes or drains to
storage/harvesting system. Water pipesshould
be UV resistant (PVC pipes) of
required capacity.
TRANSPORTATION

STORAGESYSTEM
⚫All collected rainwaterarestore in tankorbarrels used.

⚫It is a system used to deliver water for use. There are
different ways by which water from tankcan be taken
out and delivered for many purpose .Water is delivered
by pipes .
DELIVERYSYSTEM

⚫Filters are used for treatment of water to effectively
remove turbidity, colour and microorganisms. After
first flushing of rainfall, water should pass through
filters. There are different types of filters in practice,
but basic function is to purifywater.
FILTRATIONSYSTEM

WHYDOPEOPLEHARVESTRAINW
ATER?
Rains water is aprecious resource due to increases in
demand from our ever growing population. Changes in
rainfall patterns in UK have seen both drought conditions
and flooding.
•Rainwater harvesting can provide around 50 per cent
of a family’s
water needs.
•This not only saves water, but saves money and reduces
our impact on the environment.
⚫To inculcate a cultureof waterconservation
⚫To reduce soil erosion

EXAMPLES
⚫In the state of Tamil Nadu, rainwaterharvesting was made
compulsory for every building to avoid ground water
depletion.
⚫In Rajasthan, rainwater harvesting has traditionally been
practiced by the people of the Thar desert.
⚫At present, in Pune (in Maharashtra), rainwater harvesting
is compulsory for any new society to be registered.

RAIN WATER HARVESTING presentation .pptx

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