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4,000 acre feet - 20% <br />20,000 acre feet <br />20% x 75,000 days x $2.25 value = $33,750 annual benefits <br />2. With 10 floodwater- retarding structures. <br />6,000 acre feet = 30% <br />20,000 acre feet <br />30% x 75,000 visitor days x $2.25 value = $50,625 annual benefits <br />The preceeding estimates were based on acre feet of sediment pool <br />storage in lieu of surface acres and depth of the sediment pool, since a <br />stage storage curve for the Chatfield Reservoir was not available. <br />B. Estimated possible floodwater retention storage in acre feet <br />that could be available for exchanged use. <br />Normally exchange of downstream storage for upstream storage is <br />not based on an even exchange. Rate of exchange vary with watershed <br />characteristic. Based on the proximity of structure, an exchange of <br />12 acre -feet of upstream storage should be acceptable for 1 acre -foot <br />of downstream storage. Table II shows the estimated amount of <br />floodwater - retarding space that could be exchanged between upstream and <br />downstream structures. <br />