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Dam question

 
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When forming a large pond/dam does the watertight dam need to go down to bedrock?
 
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Location: Carbon Hill, AL
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I'd say no. Just dug down a few feet deeper than the ponds planned depth and compacted as the dam is built up.
I'm sure someone has a more technical answer.
But the way the soil is down here in Alabama we have plenty of clay.
 
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It is the usual permaculture answer: IT DEPENDS.

If you are't lining it, then you need to go down to an impermeable layer--either bedrock or clay. Sepp goes down to bedrock so he doesn't have to use any liner clay--a huge deal since he is usually building LAKES (much bigger than the average pond).
 
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