Research and analysis

EurOtop wave overtopping of sea defences and related structure: assessment manual

A new manual offers up to date guidance on assessing the overtopping performance of seawalls and dikes.



This manual outlines techniques for predicting the mean overtopping discharge and consequent flood volumes and drainage requirements for a range of seawall types. Holland and Germany have carried out extensive research into overtopping at embankments and dikes, and the recent European research project CLASH has expanded our understanding of overtopping.

EurOtop draws on advice developed for equivalent guides in the Netherlands and Germany, and incorporates the latest techniques and data from European and UK research on wave overtopping predictions. It covers many types of sea and shoreline defence structures, provides details on overtopping responses, and includes a wide choice of how to calculate those responses. It is supported by a webbased calculation tool that guides the user through a series of steps to predict overtopping, as described in the manual.