GRADE 2012 : procedure to derive the design hydrograph

GRADE (Generator of Rainfall and Discharge Extremes) is a new methodology to provide a better physical basis for the estimation of the design discharge of the main Dutch rivers compared to the present method based on frequency analysis of extreme discharge values. This report proposes a procedure to derive the shape of the design discharge hydrograph and the accompanying uncertainty width using the synthetic GRADE discharge series for the river Meuse at Borgharen. The focus is placed on the derivation of a design hydrograph for the failure mechanisms overflow and overtopping.