I am modeling a large delta having a number of lakes. Most of the lakes are hydraulically isolated unless overbank flow occurs. I have bathymetry for some of the lakes but not all. In cases where bathymetry is lacking and lakes are hydraulically isolated (no defined inflow/outflow channels) could I apply a material property that would adequately represent the lakes? Or would it be better to assume the bathymetry using that of a similar lake? Also, if I do use bathymetry of isolated lakes will there be issues modeling low (e.g. 2-yr recurrence interval) flows using a cold start? In short I'm trying to find a way to adequately model overbank floods where lakes are prominent and bathymetric data is limited.
Thanks for your input