This revised version of Hydraulic Engineering Circular No. 11 (HEC-11), represents major revisions to the earlier (1967) edition of HEC-11. Recent research findings and revised design procedures have been incorporated. The manual has been expanded into a comprehensive design publication. The revised manual includes discussions on recognizing erosion potential, erosion mechanisms and riprap failure modes, riprap types including rock riprap, rubble riprap, gabions, preformed blocks, grouted rock, and paved linings. Design concepts included are: design discharge, flow types, channel geometry, flow resistance, extent of protection, and toe depth. Detailed design guidelines are presented for rock riprap, and design procedures are summarized in charts and examples. Design guidance is also presented for wire-enclosed rock (gabions), precast concrete blocks, and concrete paved linings.
The report clarifies the procedure of the California Bank and Shore (CABS) layered rock slope protection (RSP) design method. There are solved problem...
Natural cobble or gravel berm beaches have long been observed to be generally more stable than sand beaches. This has led them to be used as an altern...
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United States Department of Transportation
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