Camped in the rain forests of New Guinea before the Second World War, one of the bugbears was getting wood to burn in the cooking fire. But higher up there grew one special tree, an Australian eucalypt. When first seen I hurried to 'wash' my face in its leaves. The vanishing rain forests of Australia do not have the unpleasant smell of many tropical forests. A region which is covered with good grassland soil does not produce heavy floods, but covered with deep forest soil floods are not possible.
Flood control is merely one coincidental of landscape design.