Gencade Structure definition in Wave Modeling Posted September 27, 2017 · Report reply Hello.. In my model, a part of shoreline is protected by rubble stone dumps. In order to show the shore as a non-erodible , with what arc attribute should I define it? I previously defined it as seawall, but once after I generate the GenCade grid, the initial shoreline is completely altered and the simulation results are also based on the newly created GenCade shoreline. Also is there possibility to edit the GenCade shoreline? Thank You.