Spec's Garden - I am thinking of a complete change

To follow on to my last post, the wood that I have now I intend placing a lot of it at the bottom of my raised bed, as a sort of hugelkuture type of bed, I am doing this to try and cut down the need for watering in the future especially if we start getting warmer summers, the raised bed will be sitting on a concrete base and sealed on three sides (the three sides will be made with concrete slabs) not sure if it will work, but I will never know till I try