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7`. w <br />- -- - -- <br />0 <br />Table 11 : Estimated Acre -Feet of Floodwater - <br />Retention Storage Available for Exchanged Use <br />Upstream Structures Downstream JLLUULULC > -- <br />No. of P.L. 566 Plum Creek Estimated Chatfield Estimated <br />Use Available <br />Structures on Floodwater- Retention Sp a Exchanged Y <br />P lum Creek Capacity (Rate 1.5 to 1.0 <br />g 12,177 9,133 <br />10 92-939 17-205 <br />The estimated floodwater - retarding space required in the downstream <br />structure (Chatfield) shown in Table 11'could be exchanged with upstream <br />structures (Plum Creek) and be immediately available for Public Fish <br />and Wildlife Development and for other recreational uses <br />Assumptions and Projections: <br />1. 100 -year evaluation period. <br />2. Present value per visitor days is $1.50. <br />3. 100 -year hence value per visitor day is $3.00. <br />4. Average value per visitor days is $2.25. <br />5. 75,000 visitor days for 20,000 acre -feet storage. <br />6: A direct relationship of visitor days for lessor amounts <br />of permanent storage. <br />7. Exchange use of floodwater- retention storage. <br />Estimated benefits to a P. L. 566 watershed project on Plum Creek <br />by the exchange of floodwater- retention storage space in the Chatfield <br />Reservoir. <br />1. With 8 floodwater- retarding structures: <br />9,133 ac. ft. :� 45.7% <br />20,000 ac. ft. <br />45.7% x 75,000 visitor days x $2.25 value = $77,120 <br />annual benefits <br />2. With 10 floodwater - retarding structures: <br />17,205 ac. ft. = 86.0% <br />20,000 ac. ft. <br />86.0% x 75,000 visitor days x $2.25 value = $145,125 <br />annual benefits <br />