Coastal flooding
The Drying Depth can normally be specified in the range 0.1 - 0.2 m and the Flooding Depth in the range 0.2 - 0.4 m. A difference between the two depths of 0.1 m is recommended. If the water level variations occur very rapidly (compared to the time step) you can increase the difference to 0.2 m or even more.
Inland flooding
In certain situations MIKE 21 may yield negative water depths. This can occur for instance in areas with steep gradients in the bathymetry (or topography) or by a relatively large time step in the model. To minimize the potential for mass falsification you should generally use smaller flood and dry levels for inland flooding. Appropriate values in inland flooding could be Drying depth in the range 0.001 - 0.02 m and Flooding depth in the range 0.002 - 0.05 m, where Flooding depth > Drying depth.
Note: The drying and flooding depth must be larger than 0.0001 m and 0.0002 m, respectively.
