Hi, longtime onlooker here but I can agree with what has been said but having built my own small hugelkultur mounds I though the idea was for some of the hugel to be below ground level and so for the wood to act as a wick and absorb the moisture and move it up into the mound. Being in quite a wet climate I've never had much of a problem with moisture and my hugels are mainly for increased fertility but that is what I'd always though.
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