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O 'f' 1 ~u POSTAUTIIOR IZATION DEVELOPflENTS Relocations Following authorization of the Narrows Unit, relocation of the Unton Pacific Railroad and county and state highways waS restudied. These studies were necessitated because of changes in design criteria. environmental considerations, and recommendations of cooperating agencies and concerned entities all of which developed subsequent to publication of the feasibility report in January 1967. As a result, three alternate railroad relocation routes are being con- sidered; around the northern perimeter of the reservoir, around the southern perimeter, and routing over the eKisting Burlington and Quincy Railroad tracks south of the reservoir. Also, the Bureau of Reclamation is negotiating with the Colorado State Highway Department and concerned counties regarding the use of county road relocations in lieu of relocating State Highway No. 144. Irrigation Repayment and Benefits The estimated payment capacity derived for previous analyses did not reflect an adjustment for river losses between Narrows Dam and the points of ?iversion. Subsequent to authorization and prior to contract nego~tions with the water users, the Lower South Platte Water Conservancy District (LSPWCD) employed a consultant to determine if river losses would occur. The consultant concluded that river losses would occur between Narrows Dam and the diversion points. In addition, discussions were held with staff members from the Colorado State Engineers Office, LSPWCD, and the Bureau of Reclamation. The outcome of those discussions led to the conclusions that salable water released at Narrows Dam would be reduced at the diversion point to reflect river losses. Therefore, the recommended water charges at Narrows Darn have been adjusted accordingly. The details of the adjustment are contained in the Repayment Section of this report. The impact of river losses on irrigation henefits was also con- sidered. A "Point Flow" hydrologic analysis showed the South Platte River between Narrows Dam and the Colorado State line to be a gaining stream. Therefore, it is assumed that the river losses would consist mostly of bank storage and would return to the river for supplemental irrigation use during the irrigation season. On that basis, the river losses would not reduce the beneficial irri- gation water supply and irrigation benefits would not change from the previous analysis. Repayment_ Contract Negotiat ions A proposed contract between the United States and the Lower South Platte Water Conservancy District embodying repayment provisions 7