i6 



current velocities throughout the bay system for the tests reported 

 herein; however^ it was considered desirable to check the model reproduc- 

 tion of prototype current velocities in the principal channels of the bay 

 system to insure that the distribution of flow among the several channels 

 was approximately correct. Observed prototype current velocities for 

 stations 1-6 shown on fig. 10, adjusted to conditions of mean astronom- 

 ical tide, were obtained from Coast and Geodetic Survey Special Publica- 

 tion No. 208, entitled, Currents in Narragansett Bay, Buzzards Bay, and 

 Nantucket and Vineyard Sounds, 193^. Observations were made at similar 

 locations in the model for conditions of the mean astronomical tide de- 

 scribed in the preceding paragraph. Comparisons between prototype and 

 model current velocities for the- six velocity stations are shown on figs. 

 11 and 12, and indicate satisfactory agreement between prototype and 

 model current velocities at all stations. 



Hurricane Tides 



Hurricane tides of record 



25. Gage records at Newport, Providence, and in some cases at 

 Somerset, were available for the tides generated in Narragansett Bay by 

 the hurricanes of September I938, September 19^4, and August 195^- Each 

 of these hurricane tides was reproduced in the model to determine how 

 closely the resulting model tides agreed with those of the prototype at 

 the locations for which prototype gage records were available. However, 

 the September 1938 hurricane tide was the only one used for model test 

 purposes; therefore, the comparisons of model and prototype hiorricane 

 tides for conditions of the September l^hk and August 195^ hiurricanes 

 are not included in this report. 



26. In the verification tests, the model astronomical tide gen- 

 erator was first adjusted to reproduce the astronomical tide predicted 

 for 21 September I938 (the date of the hurricane), which had a range of 

 slightly more than i|.0 ft and a high- water elevation of +k.l ft mlw at 

 Ne^rport.* The hurricane tide generator was then adjusted by a cut-and-try 



* All elevations in this report are referred to mlw at Newport, R. I., 

 which is 1.6 ft below msl. 



