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500 deep for a drain is just a guess, it might end up shallower but I don't plan to be digging that by hand that is for sure. So long as I get the fall right so that any water entering drains away it should help at least to some degree. As much as anything else I would be aiming to help keep the under floor dry, along with ventilation.
Hopefully the idea pilfered from someone else to drive star pickets well down (Think in terms of a meter driven in) inset from each corner by maybe 250mm and use them to hang the reo off will help to some degree by keying the block into the subsurface, because the only way to avoid clay around here is to hit rock! I have plenty of both. Even driving the pickets may be pot luck between driving in easy and hitting rock after six inches.
Either way, I can only do what I can do and deal with any movement later by monitoring PA and adjusting as required.
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