Bridge Backwater in Wide Valleys

by Emmett M. Laursen, (M.ASCE), Prof. of Civ. Engrg.; Univ. of Arizona, Tucson, and Consultant, Ofc. of Res. and Development, Bureau of Pub. Roads, Washington, DC,

Serial Information: Journal of the Hydraulics Division, 1970, Vol. 96, Issue 4, Pg. 1019-1038

Document Type: Journal Paper


A method is presented for calculating the longitudinal water surface profile in the reach of a river in flood which is disturbed by the presence of the bridge and embankment fill. A variety of profiles is found to be possible depending on the abstraction, or accretion, rate and the resistance to flow. Because the flow on the floodplain is concentrated by the valley crossing, backwater is possible downstream from the bridge as well as upstream.

Subject Headings: Bridges | Backwater | Rivers and streams | Floods | Flow resistance | Flow profiles | Water surface profiles | Fills

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