(c) Plan 2 was a 16- by 96-foot rectangular float with a draft of 

 3.5 feet. The prototype structure weighed 344,000 pounds and had a 

 unit weight of 44.8 pounds per cubic foot. The plan 2 model break- 

 water also had a uniform cross section, 1.6 feet wide by 9.6 feet 

 long, weighed 335 pounds, and had a unit weight of 43.7 pounds per 

 cubic foot. The details of plans 1 and 2 are shown in Figure 23. 



I ^POLYSTYRENE FC 



CROSS-SECTIONAL VIEW 



6' x 12" RECTANGULAR MODULE COMPOSED OF 

 6 BASIC UNITS POST T EN SION ED TOGETHER 



96' « 16' RECTANGULAR MOOULE COMPOSED OF 

 8 BASIC UNITS POSTTENSIONED TOGETHER 



WEIGHTS AND UNIT WEIGHTS 

 CONFIGURATION WEIGHT, lb UNIT WEI GHT, Ib/f t* 



PLAN I 2SS.G00 44.8 



PLAN 2 344,000 44.8 



Figure 23. Details of plans 1 and 2 for single-pontoon 

 floating breakwater evaluated in two-dimensional 

 wave flume for potential application at Olympia 

 Harbor, Washington (after Carver, 1979). 



All the plans investigated utilized crossed anchor chains; i.e. , beach- 

 side anchor points on the breakwater were connected to seaside anchor points 

 on the floor, and seaside anchor points on the breakwater were connected to 

 beach-side anchor points on the floor. Wave attenuation tests were conducted 

 in 25 feet of water (representative of high tide conditions in Olympia Harbor) 

 with prototype wave periods of 2.5, 3.0, 3.5, 4.0, and 4.5 seconds. Test 

 waves ranged in height from 1.5 to 3.5 feet incident, and transmitted waves 

 were measured one wavelength behind the structure. The two-dimensional trans- 

 mission coefficients, CL , for plans 1, 1A, and 2 are presented in Figure 24. 



55 



