Sammendrag
Pipe culverts are widely used for drainage and flood protection of roads in Norway. This paper reviews the effects of culvert inlet edges geometry on hydraulic efficiency. It was found that the necessary edge geometry could be determined for a wide range of designs, defined by inlet type and edge geometry. The required edge sizes are included for square, socket, bevel and rounded edges, for headwall and projecting inlets. The results indicate that an elliptical arc edge geometry can ensure high hydraulic efficiency under both inlet and outlet control conditions. The uncertainty of the reviewed data and methods is not known, and further testing is therefore necessary to validate the properties of this edge design. Further testing is also necessary in order to complement existing data and to determine the optimum design for mitered inlets. The reported, generalized results allow for development of more efficient prefabricated inlets.
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