13. (Concluded). 



b. The offshore breakwater plan will result in maximum wave heights ranging from 6.3 to 9.3 ft in the 

 entrance for operational wave conditions and 8.7 to 14.6 ft for extreme conditions depending on incident 

 wave direction. 



c. The offshore breakwater plan will not meet the 6.0-ft wave height criterion in the entrance for all inci- 

 dent waves of 14 ft or less (operational conditions). Based on hindcast data, however, the breakwater plan 

 will result in the criterion being achieved 37 percent more of the time than it currently is for existing condi- 

 tions when operational waves are present. The magnitude of wave heights also will be decreased by about 

 27 percent as a result of the offshore breakwater for operational waves. 



d. With no waves present, the offshore breakwater resulted in riverine sediment patterns similar to those 

 obtained for existing conditions except for the 100-year (41,000-cfs) discharge. For this condition, the break- 

 water prevented material from moving as far seaward in the cove as it did for existing conditions. 



e. With waves present from west-northwest and west, the offshore breakwater slightly changes the paths 

 of riverine sediment migration and subsequent deposits for some river discharges and does not for others. In 

 general, considering all test conditions, riverine sediment will deposit in an area in the cove between the ex- 

 isting jettied entrance and the proposed structure location, both with and without the breakwater installed. 



/. The offshore breakwater will not interfere with the migration of wave-induced sediment into the cove 

 for waves from northwest; however, for waves from southwest, the breakwater will prevent some sediment 

 from penetrating as deeply shoreward in the cove as it did under existing conditions. 



g. The offshore breakwater plan will have no adverse impact on surge conditions due to long-period 

 wave energy in Noyo Harbor, Dolphin Marina, and the lower reaches of the river. 



