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Rainwater Harvesting

Rainwater Harvesting. Introduction. Rainwater Harvesting is a technology used for collecting and storing rainwater from rooftops, the land surface or rock catchments. This technique usually found in Asia and Africa arise from practices employed by ancient civilizations. History.

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Rainwater Harvesting

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  1. Rainwater Harvesting

  2. Introduction • Rainwater Harvesting is a technology used for collecting and storing rainwater from rooftops, the land surface or rock catchments. • This technique usually found in Asia and Africa arise from practices employed by ancient civilizations.

  3. History • During 3rd century BC, the farming communities in Pakistan, Afghanistan, Iran, and India used rainwater harvesting for irrigation. • In ancient Tamil Nadu, Chola Kings were using this system. • Madhya Pradesh, Maharashtra and Chhattisgarh were other states who were using this system for longer years.

  4. Why rainwater harvesting? • Rainwater harvesting is essential because: • Surface water is inadequate to meet our demand and we have to depend on ground water. • Due to rapid urbanization, infiltration of rain water into the sub-soil has decreased drastically and recharging of ground water has diminished.

  5. Overview

  6. Two Techniques • Rainwater Storage for future use • Ponds • Dams • Tanks • Recharging of ground water • Pits • Dug Wells • Recharge Shafts • Hand Pumps • Trenches

  7. Recharge methods in Urban areas • Rooftop collection • Roadtop collection • Pits, Trenches, Wells, and Shafts • Water Spreading • Surface water bodies

  8. Countries • At present, the following countries uses rainwater harvesting: • India • Sri Lanka • United Kingdom • Israel • China • Brazil • U.S. Virgin Islands • Ireland

  9. Advantages • Use of natural resources • Reduces flooding, storm water, and erosion • Excellent source of water for landscape irrigation with no chemicals • Simple to install • Promotes both water and energy conservation

  10. Thank You!!! www.playppt.com

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