[Greenbuilding] cistern questions
Sacie Lambertson
sacie.lambertson at gmail.com
Thu Aug 2 09:48:54 CDT 2012
All, we have been thinking for a long time now about adding a 3-seasons
room to our house. Given the extreme drought we currently experiencing,
I've had some not-so-idle thoughts about putting a cistern under it when we
do. I have several question about this possibility and wonder if
structural-knowledgeable
people on this list could respond please.
1. Cisterns in this area are built by the same people who do septic tanks,
ie of concrete. Could I use such a tank to support a room above?
2. Our house is on a gentle slope; the end of this addition will be about 3-4
feet above grade. If we put the overflow drain lower than the top, do I
need to worry about insulating the walls of a cistern? ie there would be
room for expansion. Freezing is normal in our NE Kansas winters.
Our current in-ground cistern, 1800 gallons, filled up after only a 1.5
inch rain. Our many shed roofs drain to it. We would divert one these to
the new cistern, plus that of the room above. A new cistern would not
have as large a drain plane as the existing one, but a couple good rains
would undoubtedly fill up too.
Thanks, Sacie
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