References       http://www.lid-stormwater.net/raincist/raincist_cost.htm http://www.advancedbuildings.org/main_t_plumbing_cisterns.htm http://www.greenbuilder.com/sourcebook/Rainwater.html http://www.savingwater.org/docs/RainBarrels.doc http://clallam.wsu.edu/waterquality/rainbarr.html http://edis.ifas.ufl.edu/BODY_AE029