PREFACE 



This report is published to assist engineers in the planning, design^ 

 and construction of riprap-t)'pe revetments exposed to wave attack. The 

 work was carried out under the coastal construction research program of 

 the U.S. Army Coastal Engineering Research Center (CERC) . 



The report was prepared by Bruce L. McCartney, formerly of CERC, and 

 John P. Ahrens (who directed the tests), Coastal Structures Branch under 

 the general supervision of Dr. Robert M. Sorensen, Chief, Coastal Struc- 

 tures Branch, Research Division. 



The authors acknowledge Mr. Leonard Kraft of the Foundations and 

 Materials Branch, U.S. Army Engineer District, Omaha, for the photos of 

 the riprap and overlay on the Mobridge embankment. Technical assistance 

 was also provided by Mr. Arvid Thomsen, Chief, Economics and Social 

 Analysis Branch, Omaha District, and Mr. Paul Wohlt, formerly of the 

 Geology, Soils, and Material Branch, and Mr. Alfred Harrison, Chief, 

 Hydraulics and Hydrology Section, U.S. Army Engineer Division, Missouri 

 River. Mr. Robert Jachowski, Chief, Design Branch, Engineering Develop- 

 ment Division, CERC, reviewed the draft of this report and his many 

 comments greatly improved the final study. 



Comments on this publication are invited. 



Approved for publication in accordance with Public Law 166, 79th 

 Congress, approved 31 July 1945, as supplemented by Public Law 172, 88th 

 Congress, approved 7 November 1963. 



>^^2~, 



rOHN H. COUSINS 

 'Colonel, Corps of Engineers 

 Commander and Director 



