TABLE F-2 (continued) 

 PiinTIXENT DATA - FOX POINT BARPJER 



Land'VJalls 



Type 



Top elevation, feet ra.s.l. 



Total length, feet 



Stop log structures 



Concrete cantilever wall- -■ - 

 22.5 aotzzm 



3,Gi;0 ■'■ abrtxvf 



F-9 . DESIGN 



£. General . The structure has been designed to withstand a 

 hurricane tidal surge of 18.7 feet above mean sea level with a 

 coincident storm runoff of 9,200 cubic feet per second. 



t anncl 



b. Barrier . The shape of the barrier structure was determined 



by the need for stability to resist the storm surge, for structural ' ■'■ '''■^'' 

 continuity between the component parts, and for applicability to 

 possible future wharfage or highway use. The 3?-foot wide deck was •■•''-" 

 selected at elevation 12.5 feet above mean sea level, for wharf use 

 or access from either shore. 



c. Sluice gate structure . This structure as a part of the main ."'Qi-* 

 barrier meets the same design criteria. The gate openings are 



designed to pass the peak flood runoff of 9,200 cubic feet per sedond' ^^"'^ 

 at a differential nead of one foot. The capacity is sufficient to 

 insure full tidal flushing above the barrier under the normal " 

 conditions. :.aoo 



'■ :'on 

 a. Cooling water intake structure . This structure is designed to ''•'"'" 

 allow the passage of 1,300 cubic feet per second of cooling water for '•''"'''^ 

 the generating plants of the Narragansett Electric Company. Exhaust 

 water discharges by means of concrete pipes across the intake channel 

 into the river. The emergency intake structure is designed to furnish •'^^'^■- 

 the same quantity of water into the intake channel when the barrier - "'^' 

 gate is closed. Present and reasonable future needs of cooling water ■^''^"'^' 

 for the generating stations are met by the design quantity of 1,300 

 cubic feet per second. 



■;!- 



e. Pumping station . This structure is needed to discharge the 

 fresh water inflow during the design storm concurrent with a hurricane ' "'"'^ 

 surge to prevent upstream flooding. Overtopping at the time of peak 

 inflow would be ponded behind the barrier. The five 120-inch pumps 

 would be capable of discharging 8,000 cubic feet per second against a ' -' ' 

 22-foot differential head. During hurricane periods, the pool would "' ' 

 be maintained at an elevation of 3 feet below mean sea level for ih^ •■ •' --'^'-'-' 

 flows up to 8,000 cubic feet per second. This would facilitate rafj'id-''-^'^-^'^^ 

 drainage above the barrier. In the event of a maximum storm runoff of 

 9,200 cubic feet per second, the pumps could pass this larger quantity 

 with ponding to an elevation 3 feet above mean sea level. 



F^'= 



