![]() ![]() The culvert hydraulics in HEC-RAS are based on the Federal Highway Administrations (FHWA) standard equations from the publication Hydraulic Design of Highway Culverts (FHWA, 1985), for inlet control situations, and a detailed energy balance into, through, and out of the culvert, for outlet control computations. The model allows for multiple bridge and/or culvert openings at a single location. The bridge routines have the ability to model low flow (Class A, B, and C), low flow and weir flow (with adjustments for submergence), pressure flow (orifice and sluice gate equations), pressure and weir flow, and high flows with the energy equation only. The bridge routines in HEC-RAS allow the modeler to analyze a bridge with several different methods without changing the bridge geometry. The third part consists of losses that occur in the reach immediately upstream of the structure where the flow is contracting to get through the opening. The second part is the losses at the structure itself, which can be modeled with several different methods. One part consists of losses that occur in the reach immediately downstream from the structure where an expansion of flow takes place. ![]() HEC-RAS computes energy losses caused by structures such as bridges and culverts in three parts. Once all of the necessary cross-section data have been entered, the modeler can then add any bridges or culverts that are required. ![]()
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