河川災害の予知について

Abstract

This paper describes a flow chart of the prediction system of a river disaster, whichis composed of the propagation process of rainfall, runoff and (or) flood control and thedecision process of destruction of direct protection works against flood, after understandingnewly the occurrence conditions of the disaster in Japan. It is pointed out that such aflow chart can be used to determine a design criterion of protection works and a planningof refuge by long-term prediction and to give flood forecasts and warnings to safeguardproperty and human activities against inundation by short-term prediction, but severalelements and sub-systems involved in it remain unsolved.