hello everyone, could you tell me about swales. does one plant a fruit tree on the top of the mound, below the mound or in the crevice above the mound? does it depend on the tree? does it depend on the shape of the mound and the shape of the groove above it? does a swale run exactly on the contour and therefore there is no runoff? Or is the main aim to direct the water gently down the hill? Maybe into a pond? Thanks for your help. Sarita ???