PREFACE 



This report compares cost figures for a dolosse revetment-breakwater 

 using a higher stability coefficient (K^,) than that recommended in Chapter 7 

 of the Shore Protection Manual (SPM) . A recalculation of the cost, based on 

 the new Kp, provided some interesting observations on the consequences of 

 "overdesigning" a dolos-armored structure. The work was carried out under the 

 coastal structures research and development program of the Coastal Engineering 

 Research Center (CERC) . 



The report was prepared by Dr. J. Richard Weggel, Chief, Evaluation Branch, 

 under the general supervision of N. Parker, Chief, Engineering Development 

 Division. 



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 . 



CED E. BISHOP 



Colonel, Corps of Engineers 



Commander and Director 



