Standardization of Culvert Flow Computationsby Moe Khine, Dewberry & Davis, Fairfax, United States,
Abstract: Culvert flow computations are generally computed by the Federal Highway Administration's (FHWA) nemographs or its HY8 computer program, the U.S. Army Corps of Engineers' (COE) HEC-2 computer program, and the U.S. Geological Survey's (USGS) culvert program. However, the USGS culvert program is not as widely known as HY8 or HEC-2 programs. FHWA nomographs are also applied in the Soil Conservation Service's WSP2 computer program and FHWA-USGS WSPRO computer program. This paper examines the ability of the programs to analyze differen types of flow through the culvert when the inlet is submerged. Although the USGS culvert program can analyze all types of flow, the decision to choose the proper type of flow is left to the user. However, HEC-2 and HY8 programs do not have an option to analyze for full flow with free outlet condition (USGS type 6 flow). This paper presents a procedure to select consistent typer of flow through culverts. The differences in results amoung the present computer programs and suggested procedure can best be illustrated by an example.
Subject Headings: Federal government | Culverts | Computer software | Submerged flow | Fluid flow | Water flow | Inlets (waterway)
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