Bill :
I have had quite a few people complain that the WSEL computed in HEC-RAS 3.0 is higher than in HEC-RAS 2.2, and HEC-RAS 3.1 is even higher than in HEC-RAS 3.0. From what I have seen, it is the upstream bridge and culvert cross sections.
I have not been able to pin down a reason for the higher WSEL. Supposedly the hydraulics have been improved. However, it is discouraging to have a valid design in 2.2, and then have if not work in the newer versions of HEC-RAS because the WSEL is now higher.
Sincerely,
Chris E. Maeder, M.S.
Senior Technical Engineer
chris.maeder@bossintl.com