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Platte River Draft Environmental Impact Statement <br />Summary of Impacts of Each Alternative Compared to the Present Condition <br />(Impacts are quantified on an annual basis, unless otherwise noted) <br />Alternatives <br />Resources, <br />Governance <br />Governance <br />Water <br />Wet <br />Water <br />Significant Indicators, and <br />Geographic Areas <br />Committee, <br />Committee, <br />Leasing <br />Meadow <br />Emphasis <br />Scenario 1 <br />Scenario 2 <br />Social Analysis <br />Central Platte Habitat Area <br />Human health issues <br />No impacts <br />Out -of -bank flooding <br />a. Years with flows <br />a. 2 fewer years 18 <br />a. 2 fewer years <br />a. 1 less year <br />a. 2 fewer years <br />a. 1 less year <br />> 10,000 cfs <br />b. Change in maximum <br />b. -4,263 cfs <br />b. -3,688 cfs <br />b. -4,003 cfs <br />b. -5,091 cfs <br />b. -4,182 cfs <br />floodflows (cfs) <br />Change in groundwater levels <br />(feet) during wet years when <br />flows are greater than <br />7,500 cfs: <br />a. 500 feet from river <br />a. -0.127 feet <br />a. -0.111 feet <br />a. -0.085 feet <br />a. -0.260 feet <br />a. -0.237 feet <br />b. 1,000 feet from river <br />b. -0.068 feet <br />b. -0.054 feet <br />b. -0.032 feet <br />b. -0.166 feet <br />b. -0.161 feet <br />Change in groundwater levels <br />(feet) during normal or dry <br />years when flows are less than <br />7,500 cfs: <br />a. 500 feet from river <br />a. 0.232 feet <br />a. 0.238 feet <br />a. 0.247 feet <br />a. 0.221 feet <br />a. 0.206 feet <br />b. 1,000 feet from river 1b. <br />0.225 feet 1b. <br />0.231 feet 1b. <br />0.242 feet 1b. <br />0.214 feet 1b. <br />0.200 feet <br />Land use changes <br />Agricultural <br />lands reduced by <br />1 percent or less in the Central Platte Habitat Area <br />Cultural Resources <br />North Platte Basin <br />National Register of Historic Places <br />Pathfinder Reservoir <br />Raising spillway height may impact dam's historic character. <br />Potential Disturbance to Archaeological Sites <br />Seminoe Reservoir <br />Subject to new exposure or erosion at low water. <br />South Platte Basin <br />Tamarack Project, Phases I <br />Construction of recharge ponds, pipelines, pumps, <br />and III <br />and canals would cause ground disturbance. <br />18Out of the 48 -year period of record used in the hydrologic analysis. <br />