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<br />Commentary on Sheet 7 <br /> <br />ESTIMATED CONSTRUCTION COSTS <br /> <br />Most of the areas in the reach are developed. The natural drainageway <br />is bounded by Marston lake on the south and Marston .Shores subdivision <br />on the north. The available space for channel is limited. A <br />concrete-lined channel with sloped bottom would be constructed between <br />the lake and the Marston Shores. A side slope of 1-~:1 was recom- <br />mended. A transitional grass-lined channel was proposed to connect <br />the grass-lined and concrete-lined channel. <br /> <br />Item <br /> <br />Cost <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Grass-lined Channel - 170 feet <br />Concrete-lined channel - 2,260 <br /> <br />$ <br /> <br />feet $ <br />Total Construction Costs $ <br /> <br />Engineering and Contingencies (35% of Construction Costs) $ <br />Fiscal, legal and Administrative (5% of Construction Costs) <br />Land Acquisition costs - 2.1 acres <br /> <br />The proposed channel would contain the 100-year storm runoff without <br />overtopping the embankment of Marston lake. The Marston lake embank- <br />ment would also serve as maintenance access for the channel. <br /> <br />Total Costs <br /> <br />Annual Maintenance Cost <br /> <br />It is recommended that both the residents adjacent to the 100-year <br />floodplain and the Denver Water Department be notified annually of the <br />potential flood hazards. <br /> <br />13,800 <br />429,400 <br />443,200 <br /> <br />$ <br />$ <br /> <br />155,100 <br />22,200 <br /> <br />63,000* <br />683,500 <br />1,200 <br /> <br />*Most of this land is owned by the Denver Water Department. Past prac- <br />tice in implementing flood control projects over publicly owned lands <br />resulted in no land aquisition cost. <br />