8 = 40 cm 



he = 33cm 



on 15 Fronting Slope, 



22-cm-High Plate 



J BWI5W 



0.5 1.0 m 



Figure A-17. Breakwater 15W cross section. 



BW15W has the same dimensions and materials as BW13 and BW15, except that 

 a 22-centimeter-high metal plate 5 millimeters thick has been installed in the 

 center of the structure. This plate prevents transmission through the lower 

 part of the structure. 



B =60cm 



I on 15 Fronting Slope 



BWI6 



0.5 1.0 m 



Figure A-18. Breakwater 16 cross section. 



BW16 is a one-ninth scale Froude model of a proposed submerged breakwater 

 for Imperial Beach, California. 



8 = 60 cm 



hs= 60 cm 



I on 15 Fronting Slope 



0.5 



1.0 m 



BWI7 



Figure A-19. Breakwater 17 cross section. 



BW17 is a vertical permeable structure, similar to BWll, with the rock 

 retained by a thin wire mesh. 



76 



