Storage Capacity for Flood Operation Considering Probability of Water Level Rising during Trial Filling

Abstract

In order to check a newly constructed dam and reservoir, trial filling is carried out. Recently, trial filling requires longer time, mainly due to the shortage of inflow volume, resulting in the delay of start of dams' operation. In the case of trial filling is not over in one non-rainy season, controlling water level to secure storage capacity during rainy season is necessary. This influences the length of trial filling term. This paper discusses the safety of water level rising during trial filling and indicates the relationship among storage capacity for flood operation which satisfies required safe probability, the number of experienced rainy seasons and allowance of water level rising. Through the model dams' calculations, this paper also examines actual return periods for deciding flood operation capacities and the numbers of experienced rainy seasons.