QUARK-11

RAIN WATER HARVESTING

SOURABH D. SONIThird Year (Civil)

CIVIL ENGINEERING DEPARTMENT B. N. COLLEGE OF ENGINEERING, PUSAD

SOYAB K. SHEIKHThird Year (Civil)

Subimmited By

Contents Introduction Objectives What is rain water harvesting? Necessity of rain water harvesting. Methods of rain water harvesting. Advantages of rain water harvesting. Conclusion.

Introduction RWH is an outcome of awareness among

the people regarding the water scarcity.

Typical features of Rain Water Harvesting :- Reutilization of waste water. As RWH - neither energy-intensive nor

labour-intensive It can be a cost-effective alternative to

other water-accruing methods. With the water table falling rapidly, & concrete surfaces and landfill dumps

taking the place of water bodies, RWH is the most reliable solution for augmenting groundwater level to attain self-sufficiency

OBJECTIVES

The main objectives of rain water harvesting are :-

1. Promote rain water harvestig by creating awareness among the people.

2. increasing the avaibility of ground water during periods of requirement.

3. preventing depletion of ground water reserviour in areas of over exploitation

4. Decreasing menace of flood on local and regional scale

5. reducing pressure on storm drains in urban areas

6. enhancing the quality of environment.

What is Rain Water Harvesting?

Rain water harvesting is simply collecting, storing and purifying the naturally soft and pure rainfall that falls upon your roof.

Rain water may be utilized for both potable and non- potabke requirements such as…

• Drinking, cooking, bathing(potable water)• swimming pool• toilet flushing• Laundary• Landscape and Irrigation• Livestock and Animals

Necessity of Rain Water Harvesting Water is one of the most important natural resource,

it is the most basic need for all living beings as well as a very valuable national asset.

surface water source fail to meet the rising demands of water supply in ueban areas

water is being taken out from sub-surface water source on large scale, while on contamprary, input to it is not being matched up.

How To Harvest Rain Water? The six basic components of a rain water harvesting

system include:-

1. Catchment: Roof surface to collect rain.

2. Conveyance: Pipes from roof area to storagre.

3. Roof Washing: ‘First flush’ diverter to filter and remove contaminants.

4. Storage: Tanks where collected rain water is collected and stored.

5. Purification: Includes artificial filters, sand filters to remove suspended impurities

6. Distribution: System that delivers the rain water, usually including small pump and pressure tank.

Methods of rain water harvesting.

Roof Top Rain Water Harvesting System

Rooftop Rainwater RechargingFollowing are the methods of recharging Ground

Water Table:-

1. Well Recharging Method

2. Borewell Recharging Method:-

Other minor methods are:- Farm Pit Method Farm Trench Method

Costs and Economic Viability of Roof Water Harvesting SystemTwo types of systems:

Rooftop water harvestingRooftop rainwater

recharging

Rooftop water harvesting costs: Rs.50/m3 for 20-year life Rs.25 for a 40-year life

RWHS won’t replace public systems in most physical and climatic conditions.

When Does RWHS Work?Conditions Suitable for RWHS

Conditions Unsuitable for RWHS

High mean annual rainfall with low inter-annual variability

Low mean annual rainfall with high inter-annual variability

Rainfall spread over large number of rainy days

Intense rainfall in few rainy days with little gap between two wet spells

Hilly areas with scattered populations

Plains with dense settlements

Houses with large per capita roof area in cities

Houses with small per capita roof area like multi-storey apartments

The Dangs, Western Ghats Kachchh, Saurashtra

Rain Water Harvesting– Advantages 1.Provides self-sufficiency to water supply

2.Reduces the cost for pumping of ground water

3.Provides high quality water, soft and low in minerals

4.Improves the quality of ground water through dilution when recharged

5.Reduces soil erosion & flooding in urban areas

6.The rooftop rain water harvesting is less expensive & easy to construct, operate and maintain

7. In desert, RWH only relief

8. In saline or coastal areas & Islands, rain water provides good quality water

CONCLUSION Conservation of water. since we cannot produce energy, but we can save it

by preventing wastage. In the same way we cannot produce water, but save

it and protect our future

THIS IS NOT END, JUST BEGINNING,SO START HARVESTING THE WATER AND SAVE OUR PLANET.