Thank you for your response, dueckrandy.
Do you think it would be preferable to digitize the agricultural levees as Lateral Structures instead? I might understand than Lateral Structures should be used to separate the river channel and storage areas. In my case, the agricultural levees are discontinuous, so they do not act as structures that contains water, so there is no storage areas. That is why I thought it was better to digitize those agricultural levees as Levees in HEC GEORAS. What do you think?
Thanks a lot. This forum is a great source of help!