Tapered Inlet Design Using Specific Energy Curves

by Ronald L. Rossmiller, (M.ASCE), Asst. Prof.; Dept. of Civ. Engrg. and Engrg. Extension, Iowa State Univ., Ames, Iowa,
Merwin D. Dougal, (M.ASCE), Prof. of Civ. Engrg. and Dir.; Dept. of Civ. Engrg., Iowa State Water Resources Research Inst., Iowa State Univ., Ames, Iowa,

Serial Information: Journal of the Hydraulics Division, 1982, Vol. 108, Issue 1, Pg. 127-135

Document Type: Journal Paper


Design charts to simplify the hydraulic design of tapered inlet culverts for both rectangular and circular sections are presented. The use of these design charts greatly reduces the opportunity for error and the amount of time needed to design a tapered inlet. The use of these tapered inlet culverts in the state of Iowa has resulted in the savings of millions of dollars in construction costs over a period of years. In addition, many of these raised inlet culverts have enabled the highway department to provide ponds for recreation or for stock watering, and have helped control channel degradation and bank erosion.

Subject Headings: Hydraulic design | Culverts | Inlets (waterway) | Sustainable development | Curvature | Highway and road design | Construction costs | Ponds | Iowa | United States

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