14. The model was built on a baseplate made of l5-gage sheet metal 

 which allowed the breakwater to be rotated so different angles of wave attack 

 could be tested. Templates made from 20-gage sheet metal were riveted to the 

 baseplate to aid in construction. The templates extended through only the 

 core material in the model breakwater and had l-in.-diam holes drilled to make 

 them porous. Templates were necessarily avoided in the first underlayer and 

 primary armor because they would interface with the natural stability of the 

 material. Elevations in the first underlayer and primary armor were con- 

 trolled by measurements with an engineer's level. 



15. The model was constructed by using the cross sections (shown in 

 Plate 5) and the considerations discussed in the following paragraphs. 

 Main stem of breakwater 



16. The average stone size used to protect the exposed shoreward sec- 

 tion of the model (sta 31+25 to 34+70) was one layer of 25-ton stone placed 

 over one layer of 12-ton stone, all of which was on a compound slope of 



IV to 4H and IV to 1.5H (Section A-A, Plate 5). 



17. The model cap section was geometrically similar to the prototype 

 concrete cap, but was made of wood that was bolted to the baseplate to assure 

 no movement. 



Existing dolos area 



18. The stone material under and seaward of the existing dolosse (Sec- 

 tion B-B, Plate 5) consisted of an average stone size of 12 tons. 



19. Positioning of the existing model dolosse was controlled by using 

 aerial photographs in order to reproduce the existing prototype section as 

 accurately as possible. 



Breakwater extension 



20. The existing armor protection of the breakwater extension 



(sta 37+00 to 40+00) consists of one layer of 25-ton stone placed over one 

 layer of 12-ton stone on a 1V-to-4H slope (Section C-C, Plate 5). 



21. The shoal material seaward of the breakwater, representing remnants 

 of the old deteriorated extension toward Round Rock, consists of a mixture of 

 12- to 25-ton stone. 



22. One hundred and forty tetrapods, including 70 broken ones, were 

 added randomly in the area from sta 37+00 to 39+00 to represent the dete- 

 riorated tetrapod section. 



11 



