UNCLASSIFIED 



SECURITY CLASSIFICATION OF THIS PAGE (When Data Enlerad) 



REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



CETA 81-7 



2. GOVT ACCESSION NO 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE fand Subtitle) 



SOME OBSERVATIONS ON THE ECONOMICS 

 OF "OVERDESIGNING" RUBBLE-MOUND 

 STRUCTURES WITH CONCRETE ARMOR 



5. TYPE OF REPORT & PERIOD COVERED 



Coastal Engineering 

 Technical Aid 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfoJ 



J . Richard Weggel 



8. CONTRACT OR GRANT NUMBERfs) 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center (CEREN-EV) 



Kingman Building, Fort Belvoir, Virginia 22060 



F31232 



. CONTROLLING OFFICE NAME AND ADDRESS 



Department of the Army 



Coastal Engineering Research Center 



Kingman Building, Fort Belvoir, Virginia 22060 



12. REPORT DATE 



June 1981 



13. NUMBER OF PAGES 

 13 



14. MONITORING AGENCY NAME a ADDRESSf// dJ/fersnl from Conlroltlng Ollice) 



15. SECURITY CLASS, (of this report) 



UNCLASSIFIED 



16. DISTRIBUTION STATEMENT (ol this Report) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (ol the abstract entered In Block 20, it ditterent from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue on revet 



Design wave height 

 Revetment-breakwater 



ssary and tdenllty by block i 



Rubble-mound structures 



Stability coefficient 

 Structure , design 



0. ABSTRACT (Continue on reverse aide if necessary and identify by block number) 



A cost comparison is made between two designs for a revetnent-breakwater using 

 concrete armor units. Both designs used the same type of unit (dolosse) ; 

 however, two different stability coefficients were used in the designs. The com- 

 parison shows that significant decreases in armor unit size may result, in only 

 insignificant cost savings and even cost increases for some conditions. This 

 occurs because more smaller units are required to armor a given structure surface 

 area, and any savings in material costs is offset by the increased cost of 

 forming, stripping, and placing a greater number of scalier units. 



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