Rainwater hervesting

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My name is Halemane Prashanth

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Rainwater hervesting

  1. 1. PRESENTATION ONRAIN WATER HARVESTING PREPARED BY prashanth Halemane.
  2. 2. RAIN WATER HARVESTINGA NOBLE GOAL A COMMON RESPONSIBILITY
  3. 3. WHAT IS RAIN WATER HARVESTING Rainwater harvesting is the accumulating and storing of rainwater for reuse before it reaches the aquifer. The principle of collecting and using precipitation from a catchments surface.
  4. 4. WHY RAIN WATER HARVESTING : Surface water is inadequate to meet our demand and we have to depend on ground water. To arrest ground water decline and augment ground water table To beneficiate water quality in aquifers To conserve surface water runoff during monsoon To reduce soil erosion Due to rapid urbanization, infiltration of rain water into the sub-soil has decreased drastically and recharging of ground water has diminished.
  5. 5. RAIN WATER PATTERN IN INDIA Total annual rainfall in India: 400 million hectare- meters (area x height) India’s area: 329 million hectares If evenly spread, average height: 1.28m Actual distribution:  Highly skewed area-wise  Thar desert receives less than 200mm annually, while Cherrapunji receives 11,400mm  But almost every part of India receives at least 100mm annually Key: even 100mm annual rainfall sufficient if harvested properly and where it falls
  6. 6. RAIN WATER HARVESTINGTECHNIQUES : Roof top rainwater harvesting. Surface runoff harvesting .
  7. 7. ELEMENTS OF ROOFTOP RWH CATCHMENT COUNDITS FILTERS STORAGE FACILITY
  8. 8. METHODS OF ROOFTOP RWH Storage of direct use Recharging ground water aquifer - Recharging dug wells - Recharging pits - Recharging tube well
  9. 9. SURFACE RUNOFF HARVESTING Harvesting of surface runoff and storage of the same into reservoirs such as water pans makes it available for use when required. In this method of collecting rainwater for irrigation, water flowing along the ground during the rains will be collected to a tank below the surface of the ground..
  10. 10. TRADITIONAL RWH STRUCTUREBAWODI: Traditional step wells are called vavadi in Gujarat, or baoris or bavadis in Rajasthan and northern India. They were secular structures from which everyone could draw water. Most of them are defunct today.
  11. 11. JOHADSA johad is a crescent-shaped bund which isbuilt across a slopingcatchment to capturethe surface water beforeit runs off.Water accumulating inthe johad percolates inthe soil to augment thegroundwater. Thegroundwater then canbe used when there is norainfall.
  12. 12. Kunds Covered underground tank, developed primarily for tackling drinking water problems. Usually constructed with local materials or cement, kunds were more prevalent in regions where groundwater is saline. Before the onset of rains every year, meticulous care was taken to clean up the catchment of the kunds. Cattle grazing and entry with shoes into the catchment area of the kunds was strictly prohibited. The proximity of a kund to the house or village saved time and effort in searching for drinking water.
  13. 13. USES OF RAINWATER HARVESTING Domestic Use Agricultural Use Increase groundwater supplies
  14. 14. POTENTIAL OF RWH Impacts on downstream flows. Reduce soil erosion. Increase the crop production. Increase infiltration and groundwater recharge. Improve food & economic security.
  15. 15. ADVANTAGE It uses local construction materials and labor. Sources of energy are not needed to operate the systems. The owner/user can easily maintain the systems. The water is convenient and accessible; valuable time and effort are saved in collecting and/or hauling water. It provides a supply of water to meet future agricultural needs.
  16. 16. RWH: A NOBLE GOAL A COMMON RESPONSIBILITY
  17. 17. THANK YOU FOR ATTENTION
  18. 18. 1.Prashanth Halemane2.Vinay Vihari…………...

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