(2) The barrier woiold be of rock-fill construction; a 

 section through this barrier would be trsqpezoidal in shape with 



a 20-foot top width, at elevation 22.0 feet above mean sea level, 

 and with side slopes of 1 vertical on 2 horizontal on both the 

 ocean and bay sides. The cap stones would consist of derrick 

 stone of 20-ton minimum size. The c^ stones would extend 

 across the top and down both sides to an elevation 20.0 feet 

 below mean sea level. 



(3) This plan is based on an ungated navigation opening, 

 1,000 feet wide by 50 feet deep at mean low water. The size of 

 the opening would be varied to coordinate with Navy requirements 



at the time of construction. 



(h) Pertinent data on the East barrier structure are 

 summarized below. 



Type Rock-fill 



Top E33vation, feet m.s.l. 22.0 



Length, feet 3,200 



Maximum Height, feet 18? 



Side Slopes 1 on 2 



b. Lands and damages . The land requirements will include 

 rights-of-way, maintenance areas, and easements. The construction 

 of the barrier at the proposed site would require no relocation 

 of utilities or near-by structures. The cost of lands and damages 

 has been estimated upon the basis of current market values, and 

 information obtained from local authorities. 



F-17. WEST BARRIER 



a. Description and pertinent data . 



(1) The West barrier would be located some 600 feet south 

 of Jamestown Bridge and would extend from Pliim Beach on the west 

 to Conanicut Island on the east. The barrier would be oriented 

 normal to the existing navigation channel which lies between the 

 two main piers of the bridge, and would contain an ungated naviga- 

 tion opening centered upon the channel. In addition to the naviga- 

 tion opening, a 10-foot wide by 10-foot high culvert in the shallow 

 water at the west bank would provide free flow through the barrier 

 to eliminate excess scum formation. The culvert co\ild also be 

 used as a small boat passage. 



P-13 



