rain water harvesting. shashi ppt

7/27/2019 Rain Water Harvesting. Shashi ppt

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RAIN WATER HARVESTING - ACOMMON RESPONSIBILITY

Presented by,

Shashidhara. R. HosamaniSoumya. S. Bankapur

4th Sem, Civil Engg

SGBIT, Belgaum


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INTRODUCTION

Water is as important for survival of human being as

much as food, air etc, but hardly any attention is paid

for its economical use and conservation of this precious

resource.

The rapid growth in population and industrial

development are putting stress on the ground water

table is going down abnormally and if the problem is

not given a serious look, then the future generations

may have to face severe crisis of water.


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RAIN WATER HARVESTING

Rainwater harvesting is the

process of collecting and

storing rain water in

scientific and controlled

manner for its future use.

Rainwater can be used for

irrigating crops, washing,

cooking and drinking.


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Rainwater harvesting is a simple low-

cost technique that requires minimum

specific expertise or knowledge and

offers many benefits.

People collect and store rainwater in

buckets, tanks, ponds and wells. This

is commonly referred to as rainwater

harvesting and has been practiced for

centuries.

1


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NEED FOR RAIN WATER HARVESTING

As water is becoming scarce, it is the

need of the day to attain self-

sufficiency to fulfill the water needs.

To improve the water quality in

aquifers.

To improve the vegetation cover.

To raise the water levels in wells and

bore wells that is drying up.


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From Where We Can Harvest Rain water

Rooftops

Paved and unpaved areas

Water bodies


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COMPONENTS OF AN RWH SYSTEM

Catchment surface

Delivery system

Storage


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RAIN WATER HARVESTING TECHNIQUES

Storage of rain water on

surface for future use.

Recharge of ground water.


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The storage of rain water on surface is a traditionaltechnique and structure used in undergroundtanks, ponds, check dams, weirs etc.

Recharge of ground water is a new concept of rainwater harvesting and the structures generally usedare:

Pits Recharge

Trenches

Dug Wells

Hand Pumps


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DESIGNING OF ROOFTOP RWH SYSTEM FORHOUSES

Step 1: Calculate the quantityof water

Calculate the rooftop area

both the flat as well as thesloped areas. The area shouldbe in m2.

Water harvested (l) =

catchment area (m

2

) * runoffcoefficient (0.8) * annualrainfall (mm)


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Step 2: Designing the roof area.

A flat roof can be gently sloped to drain water

towards the down take pipes. Sloping roofs shouldhave a gutter of PVC or zinc sheet to collect water &

channel it to the down water pipe system.

Step 3: Down take pipes.

Step 4: Filter.

Step 5: First flush diverter.


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Step 6: Storage/Recharge:

Rain water that is harvested can either be stored or can

be used to recharge the groundwater. The ideal system

would a combination of both a storage tank, with an

overflow pipe connected to a recharge well.

A storage tank could be: A roof-level storage tank.

Ground level drum or masonry tank.

Below the ground sump.


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RAIN WATERHARVESTING PROJECT INKARNATAKA

Many villages in

Karnataka do not have

potable water supply.

Hence Rain water

Harvesting (RWH) hasbeen proposed as an ideal

sustainable solution.


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The Karnataka State Council for Science and

Technology (KSCST) has undertaken steps to

promote implement and create awareness on

sustainable water harvesting and groundwater

recharge concepts.

The Government of Karnataka through the Rural

Development and Panchayath Raj department has

launched a rooftop rainwater harvesting

programme.


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ADVANTAGES OF RAIN WATER HARESTING

Environment friendly and easy

approach for water requirements.

Increase in ground water level.

Reduces flooding of roads and

low-lying areas.

Reduced soil erosion.

Low cost and easy to maintain.


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DISADVANTAGES OF RAINWATER HARVESTING

The success of rainfall harvesting depends upon

the frequency and amount of rainfall; therefore, it

is not a dependable water source in times of dry

weather or prolonged drought.

Possible contamination of water may result from

animal wastes and vegetable matter.

Rainfall harvesting systems may reduce revenues

to public utilities.


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CONCLUSIONS

Rain is the first form of water that we know and

hence is a primary source of water for us. Rivers,

lakes and ground water are all secondary sources

of water.

So its our common responsibility to implement

and spread awareness about the importance of

rain water harvesting.


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A planned approach is hence needed in order to

fully utilize the potential of rainwater to

adequately meet our water requirements.

Hence, an equal and positive thrust is needed in

developing and encouraging both the types of

water harvesting systems.

We have to catch water in every possible way

and every possible place it falls.


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REFERENCES

R. Shivakumar, Worlds largest rainwater harvesting project

in Karnataka, Current Science, 162 Vol. 92, No. 2, 25

January 2007.

Patricia H. Waterfall, Rainwater Harvesting- For Landscape

Use, Second Edition, October 2004 Revised 2006.

Janette Worm and Tim van Hattum, Rainwater Harvesting

for Domestic Use, ICCO and AID Environment, Publishers,

First edition 2006.

http://www.rainwaterharvesting.org/


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http://www.aboutrainwaterharvesting.com/

http://www.rainwaterharvesting.org/urban/Components.

html

http://www.ecoindia.com/education/rainwater-

harvesting.html

http://www.tn.gov.in/dtp/rainwater.html


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THANK YOU

rain water harvesting. shashi ppt

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