[Mahmoud]

unfortunately, I have the same issue and cannot find a solution !
However, the same model is working properly in v.5.0.3.

[Mahmoud]

Thanks Cameron,

of course, i tested the culverts in EPA SWMM, SSA, Culvertmaster.
the culverts are working correctly in SSA, and EPA SWmm, but it gives the same water profile in culvertmaster like Hec RAS.

After many trials, we conclude that the problem in HEC RASwhen you have culverts generate high heading up, the flow in the culvert flowing the orifice equations which generate high difference between US and DS

[Author]

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