The geographical coordinates of the structures are either taken from the dialog or from a file. The file format is an ASCII file with two space separated items for each point on separate lines. The two items must be floats (real numbers) for the x- and y-coordinate. For each structure you must specify the type of structure. You can select either "Circular pier" or "User-specified structure". If "Circular pier" is selected you must also specify the diameter of the pier. If "User-specified structures" is selected you must enter the file name for the file containing the reflection factor table. This table should contain the reflection factor as function of the discrete values of the depth and the mean wave period. For the description of the format of the file see ASCII format for the reflection factor table. Note that the format of the table is the same whether you apply a source term approach or a convective flux approach.
You must also select the map projection (Long/Lat, UTM-32 etc.) in which you want to specify the horizontal location of the points.