Simplified method for the characterization of the hydrograph following a sudden partial dam break

This paper presents a simplified approach to the characterization of the hydrograph following the partial collapse of concrete gravity dams. The proposed approach uses a simplified representation of the reservoir geometry and is based on the numerical solution of shallow water equations to study the two dimensional evolution of the water surface within the reservoir. The numerical results are made dimensionless and reorganized so as compute the peak discharge, the duration and the recession limb of the dam break hydrograph. The proposed practical approach provides a satisfactory reproduction of the computed discharge hydrograph for a wide set of realistic situations that have been simulated in detail.