In the event of crest overtopping, CADAM3D must be able to identify the segments defining the crest. Consistent with the definition of upstream segments, the crest segments are defined using the Crest Segments command. The segments already defined on the upstream and downstream faces cannot be on the ridge. A segment can either be associated with one of the faces or the crest or remain unassociated. If the user does not define a crest segment, CADAM3D will not evaluate the influence of overtopping. Figure 37 illustrates the dialogue box defining the segments that make up the crest.


Figure 37