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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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slide1

Rainwater Harvesting

Owen Edgerton

September 25, 2006

history
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

types of rwh systems
Types of RWH Systems

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

rooftop collection system
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

gutters
Gutters

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

reservoir
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
rwh safety
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
consumption statistics
Consumption Statistics
  • Per Capita (1990) - 183 gal/d

http://www.epa.gov/water/you/chap1.html

benefits of rwh
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

designing a rwh system
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

additional information
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
slide17

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

complete system
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