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<br />Plans for the development of this area are in the conceptual stages. <br />A grass-lined channel with trickle channel is proposed in this area to <br />convey 100-year storm runoff. The channel improvements should be the <br />developer's responsibility. The proposed channel would parallel the <br />existing sanitary sewer on the north side, and would use part of the <br />sewer right-of-way for part of the channel right-of-way. <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 />Commentary on Sheet 5 <br /> <br />ESTIMATED CONSTRUCTION COSTS <br /> <br />Grass-lined channel - 2,430 feet <br />3 Riprap drop structures <br />Transitional channel with seeding - 90' <br />Total Construction Costs <br /> <br />$197,600 <br />15,300 <br />7,300 <br />$220,200 <br /> <br />A transitional channel is provided in the downstream portions of this <br />reach to connect the grass-lined channel to a sedimentation pond, <br />which will be presented on Sheet 6. <br /> <br />Runoff from the 100-year flood would be contained in the improved <br />channel. It is recommended that the site of the future development in <br />the vicinity of the channel be graded to an elevation at least that of <br />the channel bank, and that residents adjacent to the 100-year <br />floodplain be notified annually of the potential flood hazards. <br /> <br />Engineering and Contingencies (35% of Construction Costs) $ 77,100 <br />Fiscal, Legal and Administrative (5% of Construction Costs) 11,000 <br />Land Acquisition costs - 3.5 acres 105,000 <br />Total Costs $413,300 <br />Annual Maintenance Cost $ 1,200 <br />