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(a) The Global and Detailed checks with D-FLOW SLIDE fail whereas according to the by hand calculation they should succeed. However, by lack of information, the input value of several parameters (state parameter, critical retrogression length and migration velocity foreshore) is set arbitrary. Therefore, this comparison is not completely relevant, and it can't be concluded that the program gives incorrect results.
(b) The overall result is not correctly determined in D-Flow Slide if the foreshore is artificial: D-Flow Slide uses the Detailed check result but it should directly conclude that the Overall check fails.