Consequences of floods : 2D hydraulic simulations for the case study area Central Holland

Large parts of the Netherlands lie below sea-level, and the hazard of large scale floods leading to extensive damage and loss of life is always present. The Delft Cluster project?Consequences of floods? studies a range of possible consequences and aims at developing methods to quantify them. The developed methods are applied to a case study area in Central Holland. This report describes the hydraulic simulations that were carried out for this area in orde to estimate water depths and flow velocities caused by failure of the river dike near Rotterdam and the coastal defence near Katwijk. Model simulations were carried out using the hydraulic SOBEK model, SOBEK is able to model overland flow in 2 dimensions using the SOBEK-Overland Flow module. Flow through channels and smaller water courses is simulated with the ID component of SOBEK, called SOBEK-Channel Flow.