vertical flukes outward rather than downslope. There was no improvement in 

 dolos stability over Plan 2. Photos 24-26 show the structure after testing. 



31. Plan 2B (Plate 7 and Photos 27-28) was the same as Plan 2A, except 

 that special placement was used for the toe units in the seaward transition 

 area, i.e., the toe units in the second layer were placed to ensure double 

 locking with the toe units in the bottom layer (see Photo 29). This plan 

 performed less satisfactorily than Plan 2A in that failure was not gradual; 

 the entire toe area failed as one unit. Tests conducted to date indicated 

 that additional dolosse would be required to move the seaward transition 

 further out the extension into a region where the wave action would probably 

 be less severe. Photos 30-32 show the structure after testing. 



32. Plan 3 (Plate 8 and Photos 33-35) was constructed with the toe of 

 the dolos rehabilitation units still 160 ft from the outside edge of the cap; 

 however, for this plan the dolos extended further out the eastern extension 

 to sta 38+00. A total of 576 dolosse were used in the rehabilitation area. 

 The lower corner of the seaward transition area now rested on material in the 

 shoal area, and the flukes of these toe units were exposed for swl's of -1 

 and +4 ft. Damage originated in this location for these water levels and be- 

 came severe for the +7-ft swl. Although there was less damage than for previ- 

 ous plans, the damage was still too excessive for the plan to be acceptable. 

 Photos 36-38 show the structure after testing. 



33. Plan 3A (Plate 8 and Photos 39-41) was the same as Plan 3, except 

 that in the lower seaward region of the dolos rehabilitation units a 50- by 

 110-ft area was constructed three layers thick. The total number of rehabili- 

 tation units used was 615. Damage still occurred at the lower toe area of the 

 seaward transition where the toe units are exposed at the lower water levels. 

 Plans 3 and 3A may have been improved by moving the lower toe units of the 

 seaward transition into deeper water; however, the bottom profile in this area 

 is virtually flat. Thus, distance from the cap to the toe would have been too 

 great to make it a feasible alternative. Photos 42-44 show the structure 

 after testing. 



34. Plan 4 (Plate 9 and Photos 45-47) was constructed with the same 

 dimensions as Plan 3, except the toe of the seaward transition of the reha- 

 bilitation units formed a line perpendicular to the main breakwater stem, 

 with the upper corner starting at sta 38+00. A total of 525 dolosse were 

 used in the rehabilitation area. This geometry was selected for testing 



15 



