ppt on Rain Water Harvesting

RAIN WATER HARVESTING Subimm Sub immite ited d By

SOURABH D. SONI

SOYAB K. SHEIKH

Third Year (Civil)

Third Year (Civil)

CIVIL ENGINEERING ENG INEERING DEP DEPARTMENT ARTMENT B. N. COLLEGE OF ENGINEERING, PUSAD PUSAD

Contents 

Introduction



Objectives



What is rain water harvesting?



Necessity of rain water harvesting.



Methods of rain water harvesting.

 Advantages 

Conclusion.

of rain water harvesting.

Introduction RWH is an outcome of awareness among the people regarding the water scarcity scarcity.. Typical features of Rain Water Harvesting :Reutilization of waste water water..  As RWH - neithe neitherr energy-int energy-intensiv ensive e nor  labour-intensive It can be a cost-effective alternative to other water-accruing methods. With the water table falling rapidly, 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 y

y y

y

y

OBJECTI ES

The main objectives of rain water harvesting are :1. Promo Promote te rain rain water water harvestig harvestig by creating creating

awareness among the people. 2.

increasing increas ing the avaibility of ground water during periods of requirement. requirement.

3.

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

4.

Decreasing menace menace of flood on local and regional scale

5.

reducing pressure on storm drains in urban areas

6.

enhancing the quality of environment.

What i What

ai Wat r  ar

ti

ai wat r  r ha harr ti i imply coll cti , to tori d purifying purifying the na tur ally oft an d pur e r ainf all tha thatt and an natur  and f all upon your roof.



may be be utiliz utilize both pot pota ble d nonain water ma ed for both abl e an and pota pot abk bke e r equir emen entt uc uch h as«



Drin Dri nki king ng,, cooking cooking,, ba bathing( ng(pot pota abl ble e water) swimmi wimming ng pool toile toil et flush flushiing Lau La undary Land Lan dscape an and d Irriga Irrigatio tion n Li es estock tock an and d Anim ima als

Necessity of Rain Water Harvesting y

y

y

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 m eet the rising demands of water water supp supply ly in ueba ueban n area areas s 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: µFirst 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 w ater harvesting.

Roof Top Rain Water Harvesting System

Rooftop Rainwater Recharging y

Following are the methods of recharging Ground Water Table: able:--

1. Well Recharging Method

2. Bor Borewell ewell Rec Recharg harging ing Metho Method:d:-

Other minor methods are:y

Farm Pit Method

y

Farm Trench Method

Costs and Economic Ec onomic Viability Viability of  Roof Water Harvesting System y

Two types of systems: y y

y

Rooftop water harvesting costs: y y

y

Rooftop water harvesting Rooftop rainwater  recharging

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 RWHS

Suitable

for Con Conditi dition ons s Unsui nsuita tabl ble e for for RWHS

High High mean mean annu annual al rai rainfal nfalll with with Lo Low w mean ann annual ual rai rainfal fall with low inter-annual inter-annual variability variability high inter-annual inter-annual variability variability Rainfall spread over large number Intense rainfall in few rainy days of rainy days with with litt little le gap gap betw betwee een n two two wet wet spells Hilly areas populations

with

scattered Plains with dense settlements

Houses with large per capita roof  Houses with small per capita roof  area in cities area like multi-storey apartments The Dangs, Western Ghats

Kachchh, Saurashtra

Rain Water Harvesting± Harvesting ± Advantages y

1.Provides self-sufficiency self-sufficiency to water supply

y

2.Reduces the cost for pumping of ground water 

y

y

y y

y y

3.Provides high quality water, soft and low in minerals 4.Improves the quality of ground water w ater 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 y y

y

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