I am working on a culvert crossing and attempting to obtain a no rise. I have completed the model and am finding that there is a slight hydraulic jump upstream two XS’s (900 feet) that I am not able to remove from the model, regardless of culvert size. It appears to be based on the model difference between effective and existing (lower elevation at culvert section due to survey) and is generally about 0.2′. Any suggestions on how to resolve this?