comprehensive report that will include the detailed results of all plans 

 tested, regardless of whether complete or partial tests were made, since 

 the test data obtained may be of value in planning and conducting future 

 investigations of this type. Also, the results of the tests to deter- 

 mine the effects of the barriers on salinities, temperatures, sedimenta- 

 tion, and flushing will be included in the final comprehensive report. 



The Prototype 



3. Narragansett Bay is located on the coast of Rhode Island about 

 50 miles south of Boston (see location map, fig. l). The bay system is 

 about 30 miles long in a north-south direction and 15 miles wide in an 

 east -west direction, the total area being about ^50 square miles. The 

 inner bay system is connected with the ocean by two major straits. East 

 Passage and West Passage, and one minor strait formed by the Sakonnet 

 River. The East Passage is about one mile wide at the mouth and has a 

 controlling depth of about 70 ft; the West Passage is about two miles 

 wide at the mouth and has a controlling depth of about 30 ft. The 

 Sakonnet River is fairly wide and deep in its lower reaches; however, 

 the control for flow into and out of the inner bay system is a bridge 

 near Tiverton (see fig. l) which has a navigation opening only about 100 

 ft wide and about 30 ft deep. 



k. The terrain adjacent to the inner bay system ranges from high 

 cliffs to low marsh areas which are partially in\indated by normal spring 

 tides. The principal cities and towns located on the bays include 

 Jamestown and Newport, R. I., near the mouth of the bay system, and 

 Providence and Bristol, R. I., and Fall River, Mass., near the head of 

 the bay. The principal defense installations are the Newport Naval Base 

 and Quonset Point Naval Air Station. There are numerous highly developed 

 summer recreational facilities throughout the area, and a large number of 

 the harbors are utilized by commercial fishing and pleasure craft. 



5. The mean range of astronomical tides throughout the bay varies 

 from about 3 '6 ft at Newport to about U.5 ft at Providence. Astronomical 

 tides in the bay are principally of the stationary wave type, i.e., there 



