Reprint or republication of any of this material shaU 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 tliis Center. Additional copies are 

 available from : 



National Technical Information Service 

 A TTN: Operations Division 

 5285 Port Royal Road 

 Springfield, Virginia 22151 



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

 Department of the Army position unless so designated by other 

 authorized documents. 



