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<br />TABLE 5 <br /> <br /> <br />CC225ii <br /> <br />. <br /> <br />The optimum scale of development, 100-year flood protection, <br /> <br />incidentally provides 38-year protection against floods originating <br /> <br />on the Arkansas River and Two Butte Creek. The excess benefits and <br /> <br />project first costs for this protection are $42,600 and $878,000, <br /> <br />respectively. Additional protection against the Arkansas River and <br /> <br />Two Butte Creek flows can be accomplished by incremently increasing <br /> <br />the levee height along the Arkansas River. As shown in Table 5, the <br /> <br />optimum second added increment is standard project flood protection <br /> <br />which develops $9,900 excess benefits and first costs equal to $249,000. <br /> <br />However, project first costs for the combined first and second increments <br /> <br />are $1,127,000, which also exceed the local interests' financial <br /> <br />capabilities. Reducing the second added increment to 100-year flood <br /> <br />protection provides a project the local sponsor can financially support. <br /> <br />This increment provides $400 excess benefits with the first costs equal to <br /> <br />$101,000. The sums of annual benefits and costs for both first and second <br /> <br />added increments are $107,100 and $64,100, respectively with a total proj- <br /> <br />ect first cost of $979,000. <br /> <br />ADDITIONAL PROTECTION AGAINST FLOODS ON ARKANSAS RIVER & TWO BUTTE CREEK <br /> <br />SECOND ADDED INCREMENT <br /> <br /> Average Average <br /> Annual Annual Excess B/C <br />F'reQuency Benefits Cost* Benefits Ratio <br />38 0 0 <br />50 2,100 2,500 -400 .84 <br />100 6,700 6,300 400 1.06 <br />SPF 25,400 15,500 9,900 1.64 <br />* Includes annual cost for operation & maintenance. <br />. <br /> 24 <br />