Hydraulic Resistance of a Helially Corrugated Metal Pipe Culvert

Results are presented of experimental hydraulic studies of a model of a helically corrugated metal pipe culvert. Hydraulic resistance values are considered for water moving under free-flow and surcharged conditions. The influence of pipe slope and pipe filling on the roughness coefficient under free-flow conditions was determined. Recommendations are given for designating a roughness coefficient for the studied helical corrugation under free-flow and surcharged conditions.