The Experiences of Design Flood of Reservoirs in Medium and Small Basins by the Method of Design Storm

This paper is based on the experiences accumulated from the actual design flood of more than eighty thousand reservoirs on main channel of medium and small basins. Most of these dams are earth dam, so that it is not permissible the water to flow over the dam. In China, the dam break is rarely due to the deviation error of design flood. Therefore, as a reference these experiences may be useful in actual design work. China is a developing country, most of the gaging stations were established from fifties, but, part of the raingage stations were established in early thirties, this is the reason why we like to use the design storm and then to transformed it into design flood.This paper will introduce the method of design storm (including it’s spatial and temporal distribution) and the method of transformation of design storm into design flood hydrograph. The conclusion of this paper is to introduce the crystalized experiences from many and many actual flood design works in medium and small basins. I’d very happy if something might be useful to the designers in other developing countries.