This report describes the results of an evaluation of five pier-scour equations for coarse-bed streams. Scour depths calculated by the equations were compared with 18 pier-scour measurements at 3 bridge sites in Montana, 10 measurements at 2 sites in Alaska, 4 measurements at 1 site in Maryland, 1 measurement in Ohio, and 9 measurements at 2 sites in Virginia (fig. 1 and table 1). Scour measurements for each site are summarized in tables 1 and 2. The Simplified Chinese equation, the Froehlich equation, the Froehlich design equation, the HEC- 18/Jones equation, and the HEC-18/Mueller equation were evaluated based on the accuracy of pier-scour estimates and number and magnitude of underestimates resulting from each...
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