b. Alignment No. 1 . The barrier alignment normal to the center 

 line of the river proved to be the shortest of those studied, but 

 the construction of approach ranps through power plant yards and 

 longer land walls would result in increased costs. 



c. Alignment No. 2 (Selected Plan) . The barrier alignment 

 from Fox Point to Henderson Street would provide the most protection 

 at the least overall cost. 



d. Rock and earth fill barriers . Various structures were 

 investigated using combinations of rock and earth fill with con- 

 crete ^purtenant works. The rock and earth sections would provide 

 adequate protection for the Providence area, but it was found that 

 barriers of this nature would not lend themselves to easy access 

 across the river or to the possible use of the barrier for docking 

 purposes. 



e. Concrete barriers . Studies indicated that concrete struc- 

 tures would be best suited for the site. These structures would 

 not only provide the protection needed, but they would provide 

 wharf space for shipping. The punqaing station location at the east 

 end of the barrier is located on the best foundation material. The 

 eastern end location also made it possible to keep the warm water 

 discharge from the power plants remote from the cooling water 

 intakes. 



f . Control of level of Providence River . A study was made 

 for controlling the level of the Providence River upstream of the 

 barrier either by (l) diversion 6f the Woonasquatucket and Moshassuck 

 Rivers into adjacent watersheds by means of a system of open channels, 

 or (2) discharge of the river flows through press'jre conduits below 

 the barrier. 



LOWER 3AI BARRIERS 



F-16. EAST BARRIER 



a. Description and pertinent data . 



(1) The East Passage barrier would extend from Conanicut 

 Island on the west to Newport Neck on the east. It would be 

 oriented normal to the existing navigation channel and at a loca- 

 tion suggested by the U. 3. Navy. The barrier would contain an 

 ungated navigation opening centered upon the channel. 



F-12 



