Was comparing culvert analysis in FHWA HY8 and HEC-RAS.
Looking at a culvert with slope tapered inlet (Chart 59 in FHWA HEC-5).
In HY8 the input for the culvert is different than HEC-RAS. In HY8 you enter the barrel size and the larger rectangular opening at the entrance (the entrance opening can be significantly larger than the barrel size), there is input for the side taper,depression slope and throat depression.
In HEC-RAS, when you select Chart #59, HECRAS requires only the shape of the culvert. HECRAS does not request information on the rectangular opening at the entrance, throat depression, etc.
Is the HY8 slope tapered inlet the same as Chart 59 in HECRAS?