Since the time required for procurement or construction of this equipment 

 varies considerably (depending on workload, availability of plant funds, 

 and availability of shelter space), an orderly procedure usually requires 

 approximately 2 years leadtime (notification to the laboratory by the 

 sponsor that a model study will be authorized); however, experience indi- 

 cates that arrangements can be made in as short a time as 12 months. A 

 longer leadtime increases the probability that proper space and equipment 

 would be available at the desired time. 



c. Block 5 . This task requires the detailed design of all parts of 

 the model (e.g., piping systems, pump locations, tide generator locations, 

 model layout, anticipated future changes, control templates, etc.) and 

 actual construction of the fixed-bed model. 



d. Block 4 . After determining the specific requirements of the model 

 investigation, necessary hydrographic information for the model can be de- 

 fined and arrangements made to obtain the data. 



e. Block 5 . This task requires obtaining and then providing the 

 prototype hydrographic information to the laboratory. The final time 

 estimate for this task should be noted to include the time necessary 

 to prepare and transmit the information to the laboratory. 



f. Blocks 6 and 8 . As in the case of hydrographic survey require- 

 ments, after the study objectives have been established, accurate deter- 

 mination can be made of the tidal and current velocity requirements. 



g. Block 7 . Analysis of the hydraulic conditions for the inlets is 

 dependent on knowledge of the long-term tidal conditions of the bay and 

 ocean. Therefore, the tide gages should be in operation approximately 



3 months (minimum) before conducting the current velocity survey to allow 

 the velocity data to be evaluated properly. The time estimate for this 

 task should include the time required for preparing and transmitting the 

 information to the laboratory. 



h. Block 9 . This effort includes obtaining and transmitting current 

 velocity data to the laboratory. 



i. Block 10 . The laboratory analyzes and prepares the tidal and 

 velocity data for verification of the model. 



j. Block 11 . The laboratory adjusts the tide-generating mechanism, 

 the model roughness, and possibly the size and shape of the part of the 

 model which is beyond the limits of the area reproduced in detail to 

 assure accurate reproduction of prototype tides and velocities. 



k. Blocks 12 and 15 . A 1-year history of tides is necessary to 

 establish possible tide conditions for the inlet. If analysis of these 

 data indicates that extreme conditions occur a small percentage of the 

 time, limited or possibly no testing of such conditions would be sched- 

 uled. The studies are based on the assumption that hurricane-surge 

 conditions will not be investigated. 



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