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• <br />Savery Creek and the Little Snake River. PMP analyses showed <br />post-development PMF water surface elevations to range up to <br />1.7 feet below the predevelopment elevations. Sandstone Dam and <br />Reservoir would reduce expected flood damages by an average of <br />$6,100 annually. The present value of this flood control benefit <br />in constant 1956 dollars is $117000 when discounted to 1989 <br />using a four percent discount rate that is not adjusted for <br />inflation. <br />~ ~ ~ ~ ~ <br />:7 <br />2-11 <br />