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<br />The selected alternative plan is a combination of selected structural improve-
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<br />ments, major conduit, channelization, and detention, The selected alternative plan
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<br />for the various reaches is presented below:
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<br />Reach-A - Storm sewer, (S-year protection with installation of Reach-D
<br />improvements) .
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<br />The Present Worth (P,W,) is the present sum of the series of average annual
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<br />costs (AVG ANN) over the project life accounting for the time value of the money,
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<br />Based upon 1983 costs, 8,S7. interest rate, and a 50-year project life of a project,
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<br />the present worth of the potential flood damages is $8,687,000, The implementation
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<br />of the selected alternative will cost $3,911,SOO and will result in benefits of
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<br />$7,8S7,700. The benefit-cost ratio will be 2: I.
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<br />Reach-B - Channelization, (S-year protection with installation of Reach-D
<br />improvements) .
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<br />Reach-C - Storm sewer, (S-year protection with installation of Reach-D
<br />improvements).
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<br />Reach-D - Selected structural and detention (Caley Detention Dam).
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<br />Reach-E - Storm sewer, (S-year protection),
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<br />A summary of the benefits and costs for the selected plan is presented in the
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<br />following table by political jurisdiction, The DAMAGES listed are the total damages
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<br />for the status quo drainageway condition, The costs associated with the recommended
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<br />alternative is listed under IMPROVEMENT COST, and the potential damages remaining
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<br />after implementation of the plan are listed under RESIDUAL DAMAGES. The benefits
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<br />derived from the selected plan are presented under BENEFITS. The NET BENEFITS
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<br />derived from the selected alternative plan is the difference between the BENEFITS
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<br />and the IMPROVEMENTS COST. The TOTAL ANNUAL COSTS are the sum of IMPROVEMENT COST
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<br />and RESIDUAL DAMAGES.
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<br />BENEFIT/COST COMPARISON
<br />SELECTED ALTERNATIVE PLAN
<br />(1000 DOLLARS)
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<br />DAMAGES
<br />AVG
<br />JURISDICTION ANN P,W.
<br />Littleton 585.9 6.776.3
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<br />Arapahoe 165.2 1.910.1
<br />County
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<br /> TOTAL ANNUAL
<br />niP, COST RES, OAK, BENEFITS NET BENEFITS COSTS
<br />AVG AVG AVG AVG AVG
<br />ANN P.W. ANN p,W, ANN P,W, ANN P,W, ANN P,W,
<br />130,1 1,504,7 6~,1 7~2,9 ~20,8 6,023.4 390,7 4,~18,7 19~,2 2.2H,6
<br />176,3 2,039,0 6,6 76,4 1~8,6 1,834.3 -49,~ -~72,~ 214,7 2,483,2
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<br />TOTAL
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<br />7~I,1 8,687.0 338,2 3,911,~ 71,7 829,3 679,4 7,8~7.7 341,2 3,946,2 409.9 4,740,8
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