PREFACE 



This report is published to assist coastal engineers in the planning, 

 design, and construction of shore structures. The results of this 

 research are being used to develop plans for the future research on wave 

 runup and overtopping. The work was carried out under the coastal con- 

 struction research program of the U.S. Army Coastal Engineering Research 

 Center (CERC) . 



The report was prepared by John P. Ahrens, Special Projects Branch, 

 under the general supervision of Dr. Robert M. Sorensen, Chief, Special 

 Projects Branch, Research Division. 



The author acknowledges the extensive contributions to this study by 

 Drs. D. Lee Harris and Robert M. Sorensen and Messrs. R.P. Savage and 

 George Simmons. 



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. 



JAMES L. TRAYERJ 



Colonel, Corps of Engineers 



Commander and Director 



