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Rainwater Harvesting

Rainwater Harvesting. Owen Edgerton September 25, 2006. History. Developed independently across the continents India 1000BC simple stone structures for harvesting rainwater China Loess plateau ~ 0AD Rainwater wells and Jars. http://www.irpaa.org.br/colheita/02.htm#1.

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Rainwater Harvesting

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  1. Rainwater Harvesting Owen Edgerton September 25, 2006

  2. History • Developed independently across the continents • India 1000BC • simple stone structures for harvesting rainwater • China Loess plateau ~ 0AD • Rainwater wells and Jars. http://www.irpaa.org.br/colheita/02.htm#1

  3. Types of RWH Systems Source: www.lboro.ac.uk/well/resources/fact-sheets/fact-sheets-htm/drh.htm

  4. Rooftop Collection System • System components • Collection Surface • Thatched; Corrugated iron. • Gutters • Bamboo; Aluminum • Down pipe • Reservoir Source: www.lboro.ac.uk/well/resources/fact-sheets/fact-sheets-htm/drh.htm

  5. Gutters Source: www.lboro.ac.uk/well/resources/fact-sheets/fact-sheets-htm/drh.htm

  6. Reservoir • Two types • Surface • Sub-Surface • Materials: • Metal, plastic, fiberglass, brick, compressed soil (rubble-stone blocks), ferro-cement and concrete • wood, bamboo and basket weaves as alternatives have had variable rates of success. • Usually the most expensive part of the system • Tank Sizing • 1 – 40m3 Residential • >100m3 Commercial

  7. RWH Safety • Unpainted and uncoated surface areas • Timber treated with chemicals to prevent rotting should never come into contact with drinking water. • Thatched Rooftops • Coconut and Anahaw palms with tight thatching are best • Rodent infestation • Insect-proofing • First Flush system

  8. First flush and Filters Screen

  9. Consumption Statistics • Per Capita (1990) - 183 gal/d http://www.epa.gov/water/you/chap1.html

  10. Benefits of RWH • 3rd World • 20 liters • Food security • Income Generation • Southwestern United States • Sumida City, Japan • Reduces extensive runoff • Reduces energy use • Fiji • limited freshwater resource http://www.mccullagh.org/db9/1ds-4/sahara-desert-sand-dune.jpg

  11. Designing a RWH System • Consumption • Cost • Management • Advanced System Components • Rainfall • Quantity • Pattern • Collection surface area • Storage volume Average rainfall for Biharamulo District, Tanzania http://www.eng.warwick.ac.uk/DTU/rwh/styles.html

  12. Additional Information • http://www.rainharvesting.com.au/ • http://www.rainwaterglossary.com/ • http://rainwaterharvesting.tamu.edu/ • http://www.unep.org/dams/documents/ell.asp?story_id=3

  13. Mayan - 10th Century AD

  14. http://www.metrocouncil.org/Environment/Watershed/BMP/CH3_RPPSedCheckdam.pdf#search=%22check%20dams%22http://www.metrocouncil.org/Environment/Watershed/BMP/CH3_RPPSedCheckdam.pdf#search=%22check%20dams%22

  15. Collection Area Gutter Mesh Gutter Outlets Rain Heads First Flow Tank Screen Water Tank Insect Proofing Tank Top Pump Complete System http://www.rainharvesting.com.au/create_a_complete_system.asp

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