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Title: Scour Calculations

item Shields Jr, Fletcher

Submitted to: NRCS Design Guide
Publication Type: Literature Review
Publication Acceptance Date: 6/15/2006
Publication Date: 8/31/2007
Citation: Shields, F. D., Jr. 2007. Scour calculations. Technical Supplement 14B in Stream Restoration Design, National Engineering Handbook Part 654, USDA-NRCS Washington, D. C., CD-ROM.

Interpretive Summary:

Technical Abstract: The USDA-NRCS Stream Design Guide provides direction for multidisciplinary teams who are planning and designing projects that are intended to control floods or sediment sources, hasten drainage, stabilize banks, improve fish habitat, or restore ecological functions and processes. Projects of this type experience high rates of failure and maintenance due to unforeseen scour and deposition. This section (Section 15, Chapter 9) of the guide contains guidance for analyzing the amount of scour likely to occur in a channel reach after channel modifications, placement of hydraulic structures in the reach, or manipulation of flow levels or boundary conditions. Such analysis includes computations to predict bed armor formation, development of equilibrium slopes, and scour occurring as bed form troughs and on the outside of bends. Standard practices for analyzing scour in sand and gravel bed channels are summarized, and two example problems are provided.