Question about SGZ layer option

I am modeling with EE 8.3 using SGZ layer.But I’m not sure what “Typical Water Rise of above initial condition” means in SGZ layering options.Please, give me the equations or any materials about that.Thank you.

This option is used when setting the initial layering option for Sigma-Zed, it will change the assignment of layer thickness. For example if you have a very shallow cell at the IC, then only two or so layers will be used. But if you want more layers then you should add say one meter for this option, so that there are multiple layers. For estuaries you would want to pick up the typical tidal range, so you use the high tide value for this setting.