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<br />Rainwater Harvesting Policy
<br />
<br />Metal roof surfaces provide challenges. Lead, zinc & copper materials should be avoided
<br />in potable systems. See Health Issues for an excellent summary of roofing materials &
<br />health issues.
<br />Water from composite roofing material may be used for potable or nonpotable uses with
<br />careful filtration & purification (personal communication, P. Macomber). Elimination or
<br />reduction of volatile organic compounds, semi-volatile compounds, heavy metals (lead,
<br />copper & zinc) & organic pathogens is highly suggested. Furthermore, a blood urine nitrogen
<br />test from a medical doctor would be advised. Changing filters regularly is required. An
<br />oil/water separator may be useful. Composite roofing material may pose a significant health
<br />risk, so caution should be exercised. Water filtration to 1 micron with further disinfection
<br />(e.g. ultraviolet, ozone, reverse osmosis, carbon block) to eliminate biological contaminants
<br />is suggested.
<br />
<br />Bibliography & Additional Sources
<br />
<br />Texas Guide to Rainwater Harvesting, Second Edition. (1997). Austin, TX: Texas Water
<br />Development Board in Cooperation with the Center for Maximum Potential Building Systems.
<br />Retrieved February 2004 from http://www.solar783.comlrainharv.pdf
<br />Campbell, S. (1998). The home water supply: How to find, filter, store, and conserve it.
<br />Pownal, VT: Garden Way Publishing.
<br />Code Guide: Rainwater Harvesting - ICC - RES/34/#l & UPC/6/#2. Portland Office of
<br />Planning & Development Review. Section 3101.2, Section 3401.1, Section 301.2 & Section
<br />601.1. Portland, OR.
<br />City of Tucson. (March 2003), Department of Transportation, Stormwater Section. City
<br />of Tucson water harvesting guidance manual. Retrieved December I, 2004 from
<br />http://dot.ci.tucson.az.us/stormwater/educationlwhm. pdf
<br />Domestic Roofwater Harvesting Research Programme. Health Issues. Retrieved July 16,
<br />2004 from htto:llwww.eng.warwick.ac.uklDTU/rwhlhealth.html
<br />Gould, J. & Nissen-Petersen, E. (2002). Rainwater catchment systemsfor domestic
<br />supply: Design, construction and implementation. London: Intermediate Technology
<br />Publications.
<br />Ludwig, A. (2005). Water storage: Tanks, cisterns, aquifers and ponds. Santa Barbara,
<br />CA: Oasis Design.
<br />Macomber, P. (2004). College of Tropical Agriculture & Human ResoUrces University of
<br />Hawaii at Manoa (CTAHR). Guidelines on rainwater catchment systems for Hawaii. Manoa, HI:
<br />College of Tropical Agriculture and Human Resources.
<br />Macomber, P. (2004). College of Tropical Agriculture & Human Resources University of
<br />Hawaii at Manoa (CTAHR). Personal communication. (Filed as "Portable Water From
<br />Composite Roofs," c:\Documents and Settings\Gaia\My Documents\Potable water from
<br />composite roofs.doc).
<br />Mintz, E., Bartram, J., Lochery, P. & Wegelin, M. (October 2001). Not just a drop in a
<br />bucket: Expanding access to point-of-use water treatment systems. American Journal of Public
<br />Health, 91. .
<br />Parrott, K., Ross, B., Woodard, J. (1999). Household water treatment, Publication 356-
<br />481. Virginia Cooperative Extension, Virginia Polytechnic Institute and State University.
<br />Retrieved August 9,2005 from http://www.ext.vt.edulpubslhousing/356-481/356-481.pdf
<br />
<br />Tammie Stark, M.A. @
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