03-14-2010, 02:36 PM
With as much rain as Puna gets, it might be possible to just use the surface area of the water tank to catch the rain. There is an excellent book, Water Storage by Art Ludwig, that shows a ferrocement water tank with wings that funnel the water into the tank.
http://www.amazon.com/Water-Storage-Emer...0964343363
I recently attended a workshop in Mexico (http://www.flyingconcrete.com) whose instructor builds ferrocement houses. The roofs are cement. In some cases the water is funneled from the roof to a tank located under the foundation. I have seen a few of these under the house water tanks in Hawaii as well although the roofs were the standard metal ones.
A cementitious waterproofing (Thoroseal, Tegraproof etc.) can be applied to the ferrocement roof that is NSF (National Sanitation Foundation) approved for drinking water.
I have 25 minutes of video of the workshop I'd like to post to the web but my connection is so slow. Maybe when I get to a faster connection.
http://www.amazon.com/Water-Storage-Emer...0964343363
I recently attended a workshop in Mexico (http://www.flyingconcrete.com) whose instructor builds ferrocement houses. The roofs are cement. In some cases the water is funneled from the roof to a tank located under the foundation. I have seen a few of these under the house water tanks in Hawaii as well although the roofs were the standard metal ones.
A cementitious waterproofing (Thoroseal, Tegraproof etc.) can be applied to the ferrocement roof that is NSF (National Sanitation Foundation) approved for drinking water.
I have 25 minutes of video of the workshop I'd like to post to the web but my connection is so slow. Maybe when I get to a faster connection.