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TO: Platte River Water Advisory Committee <br />FROM: Don Anderson, U.S. Fish and Wildlife Service <br />DATE: 3 July 2007 <br />RE: Comments on Nebraska's `Estimated Stream Depletion in the <br />Nebraska Platte River Basin due to new irrigated Land Developed <br />After July 1,1997' report of December 5, 2006 <br />The methodology used to develop these estimates looks reasonable to me, within the <br />range of uncertainty and given the caveats articulated in this report. <br />For purposes of PRRIP review I think it would be helpful for Nebraska to more <br />succinctly summarize some of the relevant results presented in this report. For example, I <br />found it helpful to create these summary tables: <br />Estimates of net new groundwater-irrigated land and wells, 1997-2005: <br />NRD 1997-2005 net GW acres 1997-2005 new wells <br />North Platte + 15,300 323 <br />South Platte + 16,700 118 <br />Twin Platte + 53,500 477 <br />Central Platte + 74,500 1,032 <br />Tri-Basin + 33,200 616 <br />Estimated average annual depletions to the Platte River over the 1998-2038 period: <br />River Reach Est. avg annual depletion, <br />1998 through 2038 <br />WY state line to Kin sle Dam 8,200 AF/ ear <br />Kin sle Dam to Tri-Count Su I Canal diversion 10,500 AF/ ear <br />Tri-Count Su I Canal diversion to Lexin ton 11,050 AF/ ear <br />Lexin ton to U.S. Hi hwa 183 Elm Creek 2,100 AF/ ear <br />U.S. Hi hwa 183 to Cha man 2,000 AF/ ear <br />Cha man to Columbus 4,875 AF/ ear <br />TOTAL: WY state line to Columbus 39,000 AF/ ear <br />Estimated average annual depletions to the Platte River over the 1998-2038 period if the <br />only areas considered are the "Hydrologically-Connected Area for the Overappropriated <br />Basin" (above Hwy 183) and the 10%-depletion-in-50-years area (downstream of Hwy <br />183): <br />River Reach Est. avg annual depletion, <br />1998 through 2038 <br />WY state line to Kin sle Dam 8,125 AF/ ear <br />Kin sle Dam to Tri-Count Su I Canal diversion 8,750 AF/ ear <br />7ri-Count Su I Canal diversion to Lexin ton 9,300 AF/ ear <br />Lexin ton to U.S. Hi hwa 183 Elm Creek 1,425 AF/ ear <br />U.S. Hi hwa 183 to Cha man 625 AF/ ear <br />Cha man to Columbus Not evaluated <br />TOTAL: WY state line to Cha man 28,250 AFI ear