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2.3. Spui dike at km 67.8 (oud Beijerland)

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• A state parameter (for Global step 5 and Detailed checks) of -0.0605
• A critical retrogression length of 1 mlength of 42.098 m (which corresponds to the foreland length = 97.460 m - 55.362 m)
• a migration velocity foreshore of 10 100 mm/year
• For the state parameter per layer, a value of -0.04 is used for sand layers and -0.06 for the other layers.

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D-FLOW SLIDE results differ from the results by hand for the Detailed check, as show in the table below.

However, by lack of information about the hand calculation, it can't be concluded that the program gives incorrect results.