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Need to learn about methods for different climate
Quoted from my earlier post
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My main concerns with this plan are
a) aforementioned frost heave
b) how much water has to be circulated to keep it healthy
c) can this amount of water be moved with solar power without costing a rediculous amount to set up.
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Also, is it difficult to keep the pond itself from freezing over? I'm fearing this requires a pretty substantial water flow.
When the water does freeze over, is there a risk of dislodging any rocks that might be embedded around the perimiter (embedded in concrete) of the pond/brook surface?
Thanks,
Mark S.
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Need to learn about methods for different climate
For heaving to occur there is typically water involved. If the soil was perfectly dry the soil temp could go below freezing and not cause movement. So yes, water in the concrete could cause frost heave also.
Here for storage buildings/garages we sometimes pour a "floating slab" where there are thicker footings around the outside of the slab (e.g. 16" x 8" . Then the whole building is a unit that can move slightly. My shop is on a floating slab and I have had absolutely no problem over the last 7 years. Then again we have sandy soil that drains easily so water not usually a big problem. Again your local agency will be able to tell you what is permitted.
Dave
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Need to learn about methods for different climate
There may be regs for ponds larger than some volume and that would be good to check out. Similarly, I can't see a reason for not checking with health officials about septic codes since the daily fines for illegal operation can be pretty steep.
Most times older systems are grand-fathered and new codes don't apply unless changes are made but there may be maintenance requirements such as inspection and pumping. It'd be good to know requirements and the last time the system was inspected and pumped. If the in-law building is intended for occasional recreational use a separate system might be approved some places and alternatives less expensive than a new septic system may be available. We took an old system out of commission and installed a composting toilet and gray water pit at our camp for that reason.
I'd study on the pond idea a bit--there are books. I know aeration is a key to clear water and large concrete bowls are available that people cascade water from one to the other for aeration but I think it'd take quite a bit of flow for larger ponds. Some plants also help keep clear water. Such methods might keep decent water without the need for flow-through--which would create a need for connection to a surface waterway and going through more regs.
I think it would freeze during the winter but that shouldn't be a problem, although some constructions probably are better than others. For the buildings, some combination of aggregate base, drainage and concrete reinforcement would work for the area. There are other foundation types that may be easier if floors will be build. No foundation at all works pretty well for small structures.
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12-30-2003, 08:45 
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