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Rainwater Harvesting: A Beginner&#39;s Guide

Tank
ill 111 ill S:
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Garden
Car Wash
Pump
Rai nMtater
Harvesting

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INTRODCTION   Rainwater  harvesting (RWH) is the  collection and  storage of rain, rather than allowing it to run off. Rainwater is collected from a roof-like surface and  to redirected  tank, cistern, deep pit (well, shaft, or borehole),  aquifer , or a reservoir with percolation, so that it seeps down and restores the ground water .  Rainwater harvesting is one of the simplest and oldest methods of  self-supply of water  for households, and residential and household-scale projects, usually financed by the user .  However, larger systems for schools, hospitals, and other facilities can run up costs only able to be financed by owners, organizations, and governmental units.

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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
•

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Tvvo Methods of
HARVESTING RAINVMATER
are described in this
section.
Roof Top
H arvesting
It is a systern in which the
rainwater is collected frorn
the roof Of the house/
building. It can either be
stored in a tank or diverted
to an artificial recharge
systern.
Roof top rainwater harvesting is less
1
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Surface Runoff Harvesting
In urban area rainwater flows
away as surface overflow.
This runoff could be caught
and used for recharging
aquifers by adopting
appropriate rnethods.
expensive and very effective
to enhance the ground water level of the area-
Whereas- to rnake a full use collected rain water. a suitable
pressure purnp and subrnersible pun-•p can be used to deliver
water at desired location

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Disadvantages-
C] The success of rainfall harvesting depends upon the frequency and amount
of rainfall; therefore, it is not a dependable water source.
O Low storage capacities will limit rainwater harvesting so that the system
may not be able to provide water in a low rainfall period. Increased storage
capacities add to construction and operating costs and may make the
technology economically unfeasible.
Cl Cisterns and storage tanks can be unsafe for small children if proper access,
protection is not provided.
O Rainfall harvesting systems increase construction costs and may have an
adverse effect on home ownership. Systems may add 30% to 40% to the
cost of a building.
O Rainfall harvesting systems may reduce revenues to public utilities.

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Need For Rainwater Harvesting
Major parts of our country have been facing continuous failure of
monsoon and consequent deficit of rainfall over the last few years.
Also, due to ever increasing population of India, the use of ground
water has increased drastically leading to constant depletion of
ground water level causing the wells and tube wells to dry up.
In some places, excessive heat waves during summer create a
situation similar to drought.
It is imperative to take adequate measures to meet the drinking
wateüneeds of the people -in the country besides irrigation and
domestic needs.
Out of 8760 hours in a year, most of the rain in India falls in just 100
hours.

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components of RWH
RAINWATER HARVESTING
atchment
IOP
Delivery
Storage
ACE
Sit
CV'•E-n

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o In areas where there is inadequate groundwater
supply or surface resources stored rain water offers
an ideal solution
Recharging rain water into the water bodies or
aquifers help in improving the ground water table and
also the quality of exiting ground water dilution.
Construction of bunds on the ground for rain water
harvest also reduces soil erosion by water run of/
Han'esting water reduces the antount of waterflowing
to the drainage and thus reduces urban flooding.
Rainwater harvesting provides a source of water at
the point where it is needed It is owner operated and
managed

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RAINWATER
HARVESTING
• Rainwater harvesting will
help us save water.
• It is predicted that the next
World War will be fought
for water.
• Rainwater harvesting will
help in preventing floods.
• Rainwater harvesting will
reduce the stress on our
rivers and lakes.
• This method will help
aquatic life from getting
polluted and depleted.
• Strict laws should be in
place to help implement
rainwater harvesting on all
levels.

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Rainwater harvesting is an ancient practice that stills
holds many benefits and value for our modern times. It
provides an alternative water source while allowing you
to control and operate the system as you see fit.
Rainwater collection can also teach valuable lessons in
water conservation which is becoming more important
as our freshwater resources get stretched further and
further.
BSince produce energy is looking costly, but we can sav 'Z/
if bv preventing wastage.
way we eannol oroduce water. but save it

Slide Show On Rainwater Harvesting

 INTRODCTION   Rainwater  harvesting (RWH) is the  collection and  storage of rain, rather than allowing it to run off. Rainwater is collected from a roof-like surface and  to redirected  tank, cistern, deep pit (well, shaft, or borehole),  aquifer , or a reservoir with percolation, so that it seeps down and restores the ground water .  Rainwater harvesting is one of the simplest and oldest methods of  self-supply of water  for households, and residential and household-scale projects, usually financed by the user .  However, larger systems for schools, hospitals, and other facilities can run up costs only able to be financed by owners, organizations, and governmental units.

Slide Show On Rainwater Harvesting

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