Why does MIKE 21 FM claim that part of my dike structure is located at a boundary?  

A dike needs to be placed in such a way that flow can pass from one side of the structure to the other.  When the programme calculates the discharge that is affected by the dike, it aligns the structure to the nearest cell faces. It may happen that the nearest cell face is a boundary face if the polyline describing the dike is close to a boundary. See example in Fig. 1

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Fig. 1 - These images show a dike located within the domain (black solid line), but where the mesh resolution causes two of the affected elements faces (red dotted line) to be located at a boundary

User Guide. MIKE 21 Flow Model FM. Hydrodynamic Module. User Guide

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