RAINWATER HARVESTING

Reasons of Shortage of Water• Population increase• Industrialization• Urbanization• Deforestation

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What is the solution ?

• Rain water is the ultimate source of fresh water• Potential of rain to meet water demand is

tremendous• Rain water harvesting helps to overcome water

scarcity• To conserve ground water the aquifers must be

recharged with rain water• Rain water harvesting is the ultimate answer

The Solution Is…….

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Why Rain water be harvested????

• To conserve & augment the storage of ground water

• To reduce water table depletion• To improve the quality of ground

water • To arrest sea water intrusion in

coastal areas • To avoid flood & water stagnation in

urban areas

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What is rain water harvesting ?• It is the activity of direct collection of rain

water• Rain water can be stored for direct use or can

be recharged into the ground water aquifer

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The roof catchment are selectively cleaner when compared to the ground

level catchment• Losses from roof catchment are minimum• Built & Maintained by local communities• No Chemical contamination & only required

filtration• Available at door step with least cost

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The typical roof top rain water harvesting system comprises

• Roof catchment• First Flush Pipe • Filter Unit• Storage Tank

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Roof catchment• The roof of the house is used as the catchment for

collecting rain water.• The Roofs made of corrugated iron sheet ,

asbestos sheet, Tiles or Concrete can be utilized for harvesting the rain water

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First Flush Pipe

• Debris, dust & dirt collect on the roof during non rainy periods when the first rain arrive.

• A first flush system arrangement is made to avoid the entering unwanted material into the Filter media & storage tank.

• This is a simple manually operated arrangement or semi-automatic system with a valve below the ‘T’ junction

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Filter Unit

• The filter unit is a container or chamber filled with filter media such as coarse sand, charcoal, coconut fiber, pebbles & gravels to remove the debris & dirt from water that enters the tank.

• The filter unit is placed over the storage tank or separately. It may be of Ferro cement filter unit, Aluminum.

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Storage Tank• Used to store the water.• For small scale water storage plastic buckets, jerry cans,

clay or cement jars.• Provided with pipe fixtures.

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How the problem can be minimized

• By providing pipe water system with source (electric based)• (a) Surface water• (b) Deep tubewells

• Recharging stratas through rainwater harvesting methods

• (No. of villages of lower range concentration can be decreased)

• Storing rain water for drinking purpose• (a) In areas where electricity problem is more• (b) In areas where concentration is more • (c) In areas where PWS is uneconomical • (d) In areas where dependable source is not available

Made By…….

SABRISH

VAIMITRA HARI

PUSHPARAJ DAWOOD

JUSTIN

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Thank You