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<br /> Table 1II-7 <br /> BENEFITS FOR ALTERNATIVES <br /> Average <br /> Average Annual Other Annual Benefits Present Present <br /> Annual Flood Increased Open Space Total of Worth Worth <br /> Flood Damage Land and Annual Factor of <br /> Alternati ves Damaqe Reduction* utilization Recreation Benefits @ 5%** Bene fi ts <br /> Present - Do Nothing $44,800 <br /> Alt. #1 - Detention $17,300 $27,500 $1,000 $3,000 $31,500 18.2559 $575,061 <br /> Dams <br /> Alt. #2 - Channelize $ 2,500 $42,300 $5,000 0 $47,300 18.2559 $863,504 <br /> Alt. #3 - Conduits $ 1,000 $43,800 $6,000 0 $49,800 18.2559 $909,144 <br />..., <br />"" <br /> Alt. #4 - Dams With $ 7,000 $37,800 $4,300 0 $42,100 18.2559 $768,573 <br /> Channelization <br /> Alt. #5 - Floodplain $ 8,200 $36,600 0 $5,000 $41,600 18.2559 $759,445 <br /> Zone <br /> <br />* Includes all of the tangible benefits identified in Step 6, except those for increased <br />land utilization, open space and recreation. <br /> <br />** P W Factor = J1 + iln - 1 ,where i = .05 and n = 50. <br />. . (i) (1 + i)n <br />