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CCAT rainwater catchment system/Literature review
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=== Roof === The potability of the harvested rainwater is dependent on many factors. The most obvious is the material of the catchment surface, or, in this case, the roof. CCAT's roof was made of asphalt shingles, which is not ideal for potable water usage due to leaching of chemicals{{Verification needed}}, and the rainwater collected in such a system would only be suitable for irrigation use. Due to the deteriorating condition of the current roof, CCAT built a new one made of metal, and finished construction on it in January 2009. This makes an even more ideal situation for utilizing a new rainwater catchment system. The CCAT roof is 1568 sq. ft. in size which was attained by calculating the length by width of the CCAT house: 49' x 32'= 1568 sq. ft. The efficiency on a metal roof is estimated to be at about .9 which is very good for rainwater catchment. '''Ideal Roof Materials''' {| class="wikitable" ! Metal |- | The smoother the catchment surface, the better. Metal roofing materials, whether galvanized corrugated steel or aluminum, provide a smooth, bacteria un-friendly surface for rainwater to flow down. There are many options of various styles, alloys, and colors of metal roofing. Care should be taken on all re-roofing to not use lead flashings, as these will contaminate the water supply.<ref>http://www.greenbuilder.com/sourcebook/RainwaterGuide3.html#catchment</ref> |- | [[Image:clean roof pure water.jpg|frame|center|Metal roof]] |}
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