PREFACE 



This report describes methods for estimating wave transmission coefficients 

 for overtopping of impermeable breakwaters. It supplements Section 7.23 of the 

 Shore Protection Manual (SPM) and replaces the Coastal Design Memorandum No. 

 76-1 (Seelig, 1976) . The methods presented can be used with smooth or rough 

 impermeable breakwaters and for irregular as well as monochromatic incident 

 waves. Laboratory tests show that the prediction methods give useful estimates 

 of transmission coefficients for submerged breakwaters. 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. 



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. 



^ 



Colonel, Corps of Engineers 

 Commander and Director 



