PREFACE 



This report presents the results of research conducted to develop methods 

 for estimating wave transmission past submerged, subaerial, permeable, and 

 impermeable breakwaters. The final prediction techniques are given in the 

 form of computer programs, and the laboratory data used to develop and test 

 the methods are included in appendixes to this report. These methods supple- 

 ment Section 7.23 of the Shore Protection Manual (SPM) . The work was carried 

 out under the offshore breakwaters for shore stabilization program of the U.S. 

 Army Coastal Engineering Research Center (CERC) . 



The report was prepared by William N. Seelig, Hydraulic Engineer, under 

 the general supervision of Dr. R.M. Sorensen, Chief, Coastal Processes and 

 Structures Branch. J. Ahrens and M. Titus provided a significant contribu- 

 tion to this report by their many useful suggestions and valuable laboratory 

 assistance. 



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. 



TED E. BTSHOP 



Colonel, Corps of Engineers 



Commander and Director 



