ESTIMATES OF BENEFITS 



68. EVALUATED TANGIBLE BENEFITS 



Benefits which have been evaluated for the plan include flood- 

 damage prevention benefits and benefits from elimination of scare 

 costs. Benefits that may be realized from breakwaters and other 

 measures in several localities will be presented in a future report. 



Average annual flood -damage prevention benefits were derived 

 by determining the difference between anniial losses under present 

 conditions (see paragraph liS) and the losses remaining after con- 

 struction of the projects in the plan. Annual flood -damage pre- 

 vention benefits in the areas of the bay protected by the pla n 

 amount to $5,902,000, of which $1,697,000 would accrue to the area 

 above the Fox Point barrier and ftli, 205,000 to the area between the 

 Fox Point_ barrier and the Lower Bay barriers. Benefits from the 

 elimination of scare costs would amount to fi98,000 annually, of 

 which $36,000 wovild accrue to the area above the Fox Point barrier 

 and *;62,000 to the area between the Fox Point barrier and the Lower 

 Bay barriers. Total annual benefits for the two-unit plan amount to 

 $6,000,000. 



A recurrence during the fifty-year amortization period for the 

 project of the flood stages produced by the three most severe hurri- 

 canes of the past 50 years (1905-1955), those of September 1938, 

 September 19Wi and August 195U, and a recurrence of the flood-produc- 

 ing storms and other hurricanes in this period, would result in a 

 savings of $226,880,000, amounting annually to $li,538,000. Including 

 scare cost elimination benefits, the annual savings would amount to 

 $li,636,000. Substitution of the design storm for the hurricane of 

 1938 would result in a total 50-year savings of $309,960,000, or 

 $6,199,000 annually, amounting to *6, 297,000 with scare-cost benefits. 

 Table 8 presents these recurring damages, the damages that would be 

 prevented by the plan of protection and the damages that would remain 

 in the bay area. These residual damages do not reflect wave action 

 within the protected areas because available data do not permit 

 reliable estimates of such damages. 



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