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<br />. <br /> <br />potential for damage and loss of life in this densely populated <br /> <br />area. The acquisition of all lands and buildings immediately <br /> <br />downstream from the spillway is, therefore, included in this <br /> <br /> <br />component. The area considered for acquisition, however, includes <br /> <br /> <br />only that area where the existing residential buildings would <br /> <br /> <br />most likely be completely demolished by spillway discharges from <br /> <br /> <br />major floods which exceed the 50-year event. This acquisition <br /> <br /> <br />would reduce but would not remove the potential for loss of life, <br /> <br /> <br />and property damage could still reach catastrophic levels from <br /> <br /> <br />major floods. <br /> <br />MODIFICATION OF KELLY ROAD DAM AND CONSTRUCTION OF UPPER LOWRY <br />DAM <br /> <br />Seven design combinations of modifying Kelly Road Dam and <br />constructing an additional flood storage facility (Upper Lowry <br />Dam) on Lowry Air Force Base upstream from Kelly Road Dam were <br />evaluated. The level of storage provided by these combinations <br />ranged from the 100-year flood to the standard project flood. <br /> <br />A combination of modifications to Kelly Road Dam with an addi- <br />tional dam at the Upper Lowry site that would provide Kelly Road <br />Dam with a capability of storing a flood slightly greater than <br />the lOO-year event would cost about $ll million and would have a <br />benefit-cost ratio of 1.9. Total average annual benefits would <br />be about $l.5 million and average annual net benefits would be <br />$721,000. This would assure the safety of Kelly Road Dam but <br />even at this level of storage the potential for catastrophic <br />damages and possible loss of life would be significant. <br />Acquisition of lands and buildings downstream from the Kelly Road <br />Dam spillway is, therefore, included in the cost for this <br />alternative. <br /> <br />20 <br /> <br />. <br />