Dear Erica :

Does the terrain model contain the levee data, or is this something that you defined in only the HEC-RAS data. If it is part of the terrain model, then make certain you have checked "Restrict Contours to within Model Results" in the Advanced Floodplain Options dialog box. Also, note that there should not be any way for the water to "leak" outside of the levees, otherwise RMS or RiverCAD will show that the flood is outside of the levee.

If you have any additional questions or need any further information, please contact me again.

Sincerely,

Chris E. Maeder, M.S.
Senior Technical Engineer
chris.maeder@bossintl.com