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<br />decrease depending on the relative size, cost, and timing of the <br /> <br />additional sources. If large sources are added or if the additional <br /> <br /> <br />sources are added before the demand Cllrve indicates they are needed, <br /> <br />the cost would tend to increase. If small sources are added when <br /> <br /> <br />water supplies are 90 percent exhausted, the cost per acre-foot would <br /> <br />tend to decrease. Small differences in cost are not considered <br /> <br /> <br />significant because all costs are estimates and include a 25-percent <br /> <br /> <br />addition for contingencies. <br /> <br />CUMULA.TIVg IMPA.CTS <br /> <br />1.48 The cumulative analysis explores the incremental impacts of <br /> <br /> <br />DWB's proposed projects when considered along with all other <br /> <br /> <br />reasonably foreseeable actions affecting the same resources. Nearly <br /> <br /> <br />)0 reasonably foreseeable actions including Green Mountain Water <br /> <br /> <br />Sales, Rock Creek Dam, Deer Creek Dam, and Narrows Dam were included <br /> <br />in the cumulative impacts analysis. <br /> <br />1.49 Figure 1-33 shows the change in the flows that has already <br /> <br /> <br />occurred, those changes expected to occur from implementation of the <br /> <br /> <br />reasonably foreseeable actions, and changes that would occur if the <br /> <br />1,100,000 acre-foot Two Forks Dam and Reservoir and the Williams Fork <br /> <br /> <br />Gravity Collection System were added to the reasonably foreseeable <br /> <br /> <br />actions. <br /> <br />1.50 The cumulative impacts of all reasonably foreseeable projects <br /> <br />that would be the most difficult to mitigate include the effects of <br /> <br /> <br />the reduced flows on threatened and endangered species and on water <br /> <br />quality in both the Platte and Colorado River basins. <br /> <br />1-36 <br />