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I am planning on adding some drainage around the obs to help combat that sort of issue. More or less a 500 or so deep aggregate and slotted pipe drain around three sides out from the walls to intercept water coming from the high side and keep it away as best I can. A couple of meters on the low side is a dam so the water will end up in there.
Beyond that I will just check PA periodically and adjust as required and shim the pier on the block if needed. I am planning a suspended wooden floor for the obs, so no slab as such to worry about differential movement.
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