I'm sure you'll find some information on water at these links. I
really like the manuals from Texas and Hawaii
http://deercreek_63080.tripod.com/theprimitivecabinwebsite/id8.html
http://www.twdb.state.tx.us/publications/reports/ RainwaterHarvestingManual_3rdedition.pdf
http://www.eng.warwick.ac.uk/ircsa/factsheets/HawiiRainHarv.pdf
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