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Development, verification, and application of a simplified method to estimate total-streambed scour at bridge sites in Illinois

Water-Resources Investigations Report 95-4298
By:  and 
https://doi.org/10.3133/wri954298

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Abstract

A simplified method to estimate total-streambed scour was developed for application to bridges in the State of Illinois. Scour envelope curves, developed as empirical relations between calculated total scour and bridge-site chracteristics for 213 State highway bridges in Illinois, are used in the method to estimate the 500-year flood scour. These 213 bridges, geographically distributed throughout Illinois, had been previously evaluated for streambed scour with the application of conventional hydraulic and scour-analysis methods recommended by the Federal Highway Administration. The bridge characteristics necessary for application of the simplified bridge scour-analysis method can be obtained from an office review of bridge plans, examination of topographic maps, and reconnaissance-level site inspection. The estimates computed with the simplified method generally resulted in a larger value of 500-year flood total-streambed scour than with the more detailed conventional method. The simplified method was successfully verified with a separate data set of 106 State highway bridges, which are geographically distributed throughout Illinois, and 15 county highway bridges.
Publication type Report
Publication Subtype USGS Numbered Series
Title Development, verification, and application of a simplified method to estimate total-streambed scour at bridge sites in Illinois
Series title Water-Resources Investigations Report
Series number 95-4298
DOI 10.3133/wri954298
Edition -
Year Published 1996
Language ENGLISH
Publisher U.S. Geological Survey ; Information Services [distributor],
Description iv, 44 p. :ill., maps ;28 cm. +1 computer disk (3 1/2)
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