Dry detention reservoirs and depressions of any capacity

Natural or artificially created detention basins and depressions with a specific retention capacity can be used as temporary water reservoir for runoff water during heavy rainfall. They slow down the surface runoff; thus they contribute to a delay and attenuation of flood waves. They should be located at the deepest point in almost any surrounding – farmland, forests, along watercourses or within settlement areas on public or private ground. They fall dry during dry periods. Surface drainage water needs to be diverted towards them; regular maintenance needs to be assured (material accumulation).