APPENDIX 

 REVETMENT DESIGN DETAILS 



RIPRAP 



Riprap 



Filter 

 SECTION 



Rock revetment at Chesapeake Bay, Md. 



Prototype Installation : 



Riprap is the most common revetment type in the United States with 

 many prototype installations. 



Wave Tank Tests : 



Small scale (Hudson and Jackson, 1962). 



Near prototype scale (Thomsen, Wohlt, and Harrison, 1972; Ahrens, 1975) 



Design Factors : 



Zero-damage wave height: Depends on rock size. 

 Wave runup: 0.5 compared to smooth slope. 

 Wave reflection: Low. 



Remarks : 



Design information listed in the SPM. 



Riprap stability changes with slope and wave period (Ahrens and 

 McCartney, 1975). 



Economy can often be obtained by matching the riprap gradation to 

 the local quarry-yield gradation. 



Quality control in construction is needed to assure proper gradation 

 on slope (no sections with a predominance of fines). 



Minimum of two layers of riprap armor recommended with adequate 

 filter layer. 



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