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<br />. <br /> <br />The plan would preclude 430 acres of land on Lowry Air Force <br /> <br /> <br />Base from potential development. This would reduce the amount of <br /> <br /> <br />land available for future expansion of Air Force facilities. <br /> <br />Economics of Selected Plan <br /> <br />This section summarizes the economic analysis of the selected <br /> <br /> <br />plan. Interest and amortization values are based on a discount <br /> <br /> <br />rate of 7.125 percent and an economic life of lOO years. <br /> <br />COSTS <br /> <br />. <br /> <br />The following paragraphs summarize the first costs and annual <br /> <br /> <br />charges for the selected plan components. The first costs of the <br /> <br /> <br />components located on Lowry Air Force Base include a contingency <br /> <br /> <br />allowance of approximately 25 percent, engineering and design <br /> <br /> <br />costs of approximately 9 percent, and supervision and adminis- <br /> <br /> <br />tration costs of approximately 6 percent. The cost estimates for <br /> <br /> <br />the downstream channel improvements and the upstream drainage <br /> <br /> <br />improvements are frOOl the February 1977 report "Major Drainageway <br /> <br /> <br />Planning-Westerly Creek" by the consultant to the Urban Drainage <br /> <br /> <br />and Flood Control District. These estimates include a contin- <br /> <br /> <br />gency allowance of approximately l5 percent, engineering and <br /> <br /> <br />design costs of approximately 13 percent, and supervision and <br /> <br /> <br />administration costs of approximately 6 percent. Annual costs <br /> <br /> <br />include interest and amortization and operation, maintenance, and <br /> <br /> <br />replacement. The cost estimates are based on February 1979 price <br /> <br /> <br />levels. <br /> <br />so <br />