1_ During periods of attack by exceptionally high short- 

 period storm waves, wave heights in mooring areas II and III of the east 

 basin and in the fairway should exceed those generally accepted as safe 

 for the navigation and the anchorage of small boats. 



8^ Reducing the length of the detached north breakwater 

 by amounts up to 300 feet had little effect on wave heights in the east 

 basin. However, wave heights in the east entrance to the harbor increased 

 considerably, and serious overtopping of mole E occurred for all reduc- 

 tions in length greater than about 50 feet. 



6. Cost and Time Estimates . 



a. Harbor Wave Action Models, Short-Period Waves . In the conduct 

 of short -period, harbor wave action models, the sponsoring agency usually 

 furnishes the required field data at the outset of the study. These data 

 include deepwater wave statistics, refraction diagrams from which the 

 deepwater data can be converted into shallow-water wave data at the posi- 

 tions of the wave generator, tidal data, wind setup information, topo- 

 graphic and underwater contour data, and detailed plans of all existing 

 and proposed harbor structures. Since the laboratory usually has the 

 necessary wave generator on hand and adequate shelter space, the cost of 

 these items and the costs of obtaining the necessary field data (listed 

 above), are not included in the laboratory cost and time estimates for 

 short -period, wave action models. Most harbor wave action model studies 

 in which short-period waves are the primary problem involve the following 

 Work items: 



(1) Preliminary model design and cost estimate, and neces- 

 sary travel, conferences, and correspondence before authoriza- 

 tion to conduct the model study. 



(2) Final model design. 



(3) Model construction. 



(4) Calibration and adjustment of wave generator and wave- 

 measuring apparatus for the selected test conditions. 



(5) Conduct of model tests, including modifications of the 

 model in accordance with the different plans, computer time, 

 drafting and photography as required, preparation of monthly 

 progress reports, and model demonstrations and conferences with 

 representatives of the sponsoring agency (obtaining and process- 

 ing of motion picture film showing wave action conditions in a 

 harbor are sometimes requested as a special item; however, these 

 costs are not included in the cost estimates). 



(6) Analysis of test results after testing has been com- 

 pleted; preparation for and hosting of a final conference at 

 which time the test results are presented and discussed. 



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