Report on the Nelson Buck Unit, Kansas

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The irrigation allocation would be repaid in amounta of $480,000 by the irrigation district and $2,349,900 from MRBP power revenues. The estimated annual benefits are: Direct Total irrigation $ 99 0 500 $ 124,000 Flood Control 564,000 564,000 Recreation 91,200 91,200 Fish and Wildlife , 46,100 46Z 100 Total $800,600 ; 825 The benefit cost ratios are 1.13 to 1 based on direct benefits and 1.17 to 1 based on total benefits. Depletion by the Nelson Buck unit is estimated in the report to be €3,500 acre fact annually. Average annual reservoir evaporation is estimated to be 4,900 acre feet, which is approx- imately 58 percent of the total depletion. This is due to the fact that the water supply is of such an erratic nature that a reservoir capacity of almost 56,000 acre feet is required to meet an average annual diversion demand of 5 acre fact, with long periods of holdover storage necessary. The Republican River Compact made: specific allocations of Oche annual virgin water supply originating in the <. ver Creek drainage :.sin as follows: To Colorado 3,300 acre feet To Kansas 6,400 acre feet To Nebraska 6,700 acre feet These allocations were derived from the computed average annual virgin water supply for Deaver Creek of 16,500 acre feet. The compact provides that if the future computed water supply should vary more than 10 percent from the original computation, the al- locations shall be increased or decreased in the relative propor- tions that the future comgnated water supply briars to the original computed water supply. The report estimates that present use rigators In Kansas is 3,000 acre feet per year. proposed unit, total depletion of Beaver Creek Kansas would be 11,500 acre feet per year. This feet more than the compact allocation. by private ir- Thus, with the flows for use in would be 5,100 acre Memorandum -2- May 16, 1967