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@LincolnPE: Right, and knowing that relationship, would you assume that it is OK to utilize HDS-5 when HY-8 is not allowed?

Interesting use of quotes... as if you could tell that the drainage manual was not actually a legitimate drainage manual. Since this regulatory manual has had multiple authors over many years, it would be quite impossible to find out what the "author" was thinking. Neither is expressly listed...

@Twinkie: CulvertMaster is proprietary software, which is the reason I limited the choice of hydraulic calculation methods to HEC-RAS and HDS-5. If you still do not understand the question, please let me know what further information you need. @BigInch: HDS-5 is the US FHWA methodology. By...

The correct terminology in PA would be pipe culvert; a pipe conveying a stream or other surface runoff across a highway right-of-way, apart from the pavement drainage system. The analysis is to determine headwater elevation and flow velocities.

I am looking for recommendations from experienced users. For cross-pipe analysis of pipes which are not culverts that impact FEMA floodplains, and where HY-8 is invalid due to velocity limitations, would you recommend using HEC-RAS or using HDS-5 Nomographs? Why?

I am using HY-8 for the analysis of existing cross-pipes, trying to determine headwater elevations. The drainage manual i am using lists conflicting limitations for the HY-8 software. In one instance, it is noted that HY-8 should not be used where entrance velocity exceeds 5 ft/s. In another...