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Info on Cob cistern and Cob Swauna (sweat:sauna)Vernon B. Johnston vajohnston at nas.com
Thu Oct 30 16:45:08 PST 1997
: >Aloha, >You may be aware of this already, but it is the metal reinforcing that >provides tensile strength, not the cement/mortar (concrete has high >compressive strength, very low tensile strength). I'd recommend >nice heavy chicken wire or even light concrete reinforcing mesh to >be sure of plenty of tensile strength - one piece with only one (vertical) seam/joint would be strongest. By the way, how big is this >cistern volume-of-water-wise? >John Schinnerer >Vernon - > > thanks a lot for the information about using cob to build a cistern. >and thanks for more reassurance about the use of cob in high->moisture >environments (the sauna). > > what is the height of the cistern? >thanks >lars fields > Thanks for the feedback on the cistern, as well as the swauna. I will incorporate the advice from John on using either a heavier mesh chicken wire or a light weight metal lath reinforcing wire. It makes good sense. The size of my cistern is 8 feet in diameter. I will go to the height of at least 7 feet. At (according to my calculations) 8 feet diameter that would give me approximately 375 gallons of water per foot. 7ft in height X 375 gal = 2,625 gal of water. That's a very workable amount for the household. We get an average of 42" of rain per year here. For every 1000 sq ft of roof space that 1 inch of rain falls on that roof we get about 600 gallons of water. If I need another tank for extra water for summer irrigation & storage then I will add another tank. In the meantime this will serve us well. I may add an additional small open tank in the green house. This could be used for soaking, watering, and fun... I borrowed this idea from The EARTHSHIP people who this design in their rammed tire homes, but... with my own modifications. There are several good references on Rainwater harvesting including a book by Arnold Pacey and Adrian Cullis entitled "Rainwater Harvesting". There is also a website or two that speaks of rainwater collection. Lars, I noticed that you are interested in methane digesters. Are you also interested in self-composting toilets. Seems that I will build a satellite composting toilet eventually. Still not sure of the design. Anyway, thanks for the feedback and ideas. Vernon
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