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t <br />project involving diversions to recharge in Reach 13 is about $2.1 <br />million, as shown in Table 8.G.41. The total capital costs associated <br />with potential recharge projects in Reaches 16 (Gothenburg Canal) and <br />17 (Dawson Canal) are about $650,000 and $880,000, respectively, as <br />shown in Table 8.G.41. The resulting cost per ac -ft of reductions to <br />target flow shortages range from $600 to $1,300 without diversions <br />and from $620 to $2,590 with diversions. <br />Pumping from the Groundwater Mound <br />A mound of stored groundwater (the "mound ") has been created <br />beneath the canals, reservoirs and irrigated lands associated with the <br />Nebraska Public Power District (NPPD) and the Central Nebraska <br />Public Power and Irrigation District ( CNPPID). The existence of the <br />mound is confirmed by Nebraska State maps of groundwater level <br />changes. <br />The study team has relied on the report "The Impact of NPPD and <br />CNPPID on the Platte River: Nebraska's Ground -Water Mound" by <br />Bredehoeft and Hinckley, July 1998, to evaluate projects that involve <br />pumping from the groundwater mound. This report was prepared by <br />the State of Wyoming to support their position in the Nebraska v. <br />Wyoming lawsuit. While the Bredehoeft- Hinckley report suggests that <br />the mound is growing, the "Report on the South - Central Area Ground <br />Water Planning Study" by NNRC, 1990, suggests the possibility that <br />the growth of the mound could stabilize or even reverse direction in <br />the future. The operations of NNPD and CNPPID greatly influence the <br />growth rate of the mound. Due to the uncertainty regarding the growth <br />rate of the mound, further investigation and monitoring would be <br />required prior to implementing projects that involve pumping from the <br />groundwater mound to ensure the sustainability of these projects. <br />The estimated growth rate of the mound is critical in determining the <br />sustainability of these alternatives, therefore, an accurate <br />understanding of the hydrologic characteristics and growth rate of the <br />mound and the potential impacts of these projects is required prior to <br />implementation. Any project that mines the groundwater mound would <br />likely be to the detriment of existing water users and potentially the <br />environment, in which case the project would come under strong <br />opposition. 0 <br />8 -G -54 <br />