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- W299407653 abstract "The flood of 1993 inundated much of the upper Mississippi River Basin, resulting in significant damage at numerous sites in Iowa. A record flood on Brushy Creek resulted in failure of the US-71 bridge 14.5 km south of Carroll, Iowa. Development of a computer flow model at the site and analysis of scour for the failed bridge and its replacement are included. On the basis of data from plans, topographic maps, and a United States Geological Survey (USGS) crest stage gage at the site, the computer model was developed using WSPRO (a USGS/FHWA computer program for Water Surface Profile Computations). To construct the computer model, cross sections were developed, and Manning's roughness coefficients n were assigned, such that known stage elevations were produced for a given flow. The model was then used to estimate flood flows during the event. Scour was estimated using the WSPRO data, soil boring data, and procedures from HEC-18, Evaluating Scour at Bridges. Long-term aggradation or degradation, contraction scour, and local pier scour were all evaluated. The case study allowed verification of HEC-18 procedures and formulas based on an actual flood event versus a laboratory flume study. The scour analysis predicted scour below the pile tips at the piers, and the bridge failed when the piers were undermined--good evidence of the validity of HEC-18 scour calculations. The computer program WSPRO and the scour procedures from HEC-18 as analysis tools that can be used to assess stream flows, scour potential, and design adequacy are presented." @default.
- W299407653 created "2016-06-24" @default.
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- W299407653 date "1995-01-01" @default.
- W299407653 modified "2023-09-27" @default.
- W299407653 title "JULY 1993 FLOOD DAMAGE TO US-71 BRIDGE OVER BRUSHY CREEK, CARROLL COUNTY, IOWA: CASE STUDY" @default.
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