Reprint or republication of any of this material shall give appropriate 

 credit to the U.S. Army Coastal Engineering Research Center. 



Limited free distribution within the United States of single copies of 

 this publication has been made by this Center. Additional copies are 

 available from: 



National Technical Information Service 

 ATTN: Operations Division 

 5285 Port Royal Road 

 Springfield, Virginia 22161 



The findings in tliis report are not to be construed as an official 

 Department of tlie Army position unless so designated by other 

 authorized documents. 



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