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A modified index for assessment of potential scour at bridges over waterways

Open-File Report 96-554

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Abstract

The modified potential-scour index described in this report is based on a potential-scour index used by the U.S. Geological Survey Maryland District (Maryland index), and a prototype index developed by the U.S. Geological Survey Tennessee District (Tennessee index). The modifications were made to (1) improve the technical content of theMaryland index, and (2) provide a more extensive set of index variables for assessment of potential scour at bridges. The report demonstrates and describes problems that were encountered when using the Maryland index in a study of county- maintained bridges in Maryland from 1993 to 1995.The modifications made to specific index variables and ranking values in the Maryland index are presented and discussed. A comparison of potential-scour ratings from the modified potential- scour index, as applied to two bridges, is presented.This comparison indicates that the modified potential-scour index produces potential-scour ratings that most consistently reflect scour conditions observed at these bridges.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A modified index for assessment of potential scour at bridges over waterways
Series title:
Open-File Report
Series number:
96-554
Edition:
-
Year Published:
1996
Language:
ENGLISH
Publisher:
U.S. Geological Survey ; Branch of Information Services [distributor],
Description:
iv, 16 p. ;28 cm.