rain water harvesting

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  • 1. Rain Water Harvesting : Analternate Source of WaterBy : Pradeep Limani Mentor: Mr. Bhaven Tandel (U09CE077) Assistant ProfessorCED, SVNIT

2. Introduction The total amount of water on earth remains constant. The rapid growth in population together with the extension of irrigated agriculture and industrial development, are putting stress on the natural ecosystems. In the face of growing problems, society has begun to realize that it can no longer subscribe to a use and discard philosophy with any natural resource. One such resource is WATER. To deal with it, a technique called RAIN WATER HARVESTING was introduced where rain water is used to 3. What is Rainwater Harvesting Rainwater harvesting is the accumulating andstoring, of rainwater. It has been used toprovide drinking water, water for livestock, water forirrigation or to refill aquifers in a processcalled ground water recharge. The principle of collecting and using precipitationfrom a catchments surface. Rain water harvesting means to make optimum use ofrain water at the place where it falls i.e. conserve it andnot allow draining away and causing floods elsewhere. 4. Need of Rainwater Harvesting Water is becoming scarce. Surface water is inadequate to meet our demand. We have to depend on ground water. To reduce soil erosion. Groundwater is getting depleted and polluted. Improves the ground water quality. Increasing population of India. Of the total water on earth, only 3% constitutes freshwater. Rest is saline water in the oceans. 11% of the total fresh water on earth is groundwater available upto a depth of 800m which can be extracted for use 5. Rainwater Harvesting Techniques Roof top rainwater harvesting. Surface runoff harvesting . 6. Roof Top Rain Water Harvesting In rooftop harvesting, the roof becomes the catchments, and the rainwater is collected from the roof of the house/building. It can either be stored in a tank or diverted to artificial recharge system. This method is less expensive and very effective and if implemented properly helps in augmenting the ground water level of the area. 7. How to Harvest Rainwater Collect water from the rooftop. Draw it down from pipes. Filter the water. Store in a sump or tank for later use. Charge the groundwater through a soak pit. Lead the water into a well to increase ground water content. 8. Elements of Rooftop RainwaterHarvesting CATCHMENT COUNDITS FILTERS STORAGE FACILITY 9. SURFACE RUNOFFHARVESTING Harvesting of surfacerunoff and storage ofthe same intoreservoirs such aswater pans makes itavailable for use whenrequired. In this method ofcollecting rainwater forirrigation, water flowingalong the groundduring the rains will becollected to a tank 10. TRADITIONAL RWHSTRUCTUREBAWODI: Traditional stepwells are calledvavadi in Gujarat, orbaoris or bavadis inRajasthan andnorthern India. They were secularstructures fromwhich everyonecould draw water. Most of them aredefunct today. 11. Kunds or Kundis Covered undergroundtank, developed primarily fortackling drinking waterproblems. Usually constructed with localmaterials or cement, kunds weremore prevalent in regions wheregroundwater is saline. Before the onset of rains everyyear, meticulous care was takento clean up the catchment of thekunds. The proximity of a kund to thehouse or village saved time andeffort in searching for drinkingwater. 12. Ooranis Designed to harvestand store rainwaterto meet the drinkingneeds of acommunity. Created byexcavating the soilwhich is then usedto form bundsaround the area. More than 39000ooranis inTamilnadu statealone 13. Paar System The rainwater flowsfrom the agar(catchment area) andin the processpercolates into thesandy soil. Kuis or beris are dug5 to 12 m deep toaccess the water. Rainwater harvestedthrough the paartechnique is knownas patali paani. 14. Advantages of RWH RWH is the ideal solution for all water requirements. Increase in ground water level. Reduces flooding of roads . Reduced soil erosion. Improves the ground water quality. Low cost and easy to maintain. Reduces water and electricity bills 15. Disadvantages of RWH Seasonal nature and uncertainty of rainwater supplydepending on the region in the world. Capital costs . Regular maintenance and cleaning is essential forsuccessful operation. 16. Summary On of the best way to solve the world burningfacing issue: Water Scarcity. Helps in Raising Ground water level. Saving of energy per lifting of well and saving ofWater bills. Harvested water can be used for Daily householdneeds. It is economical. Its not a permanent solution as water is notavailable throughout the year but it can be utilizedto its maximum extent. Water is an important resource we should be verycareful while dealing with it. 17. Rain Water HarvestingNoble Goal 18. THANKYOU