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<br />n f..: _:,41 0 ~~ <br />U .J .~.....;, -.J <br /> <br />Draft: April 21, 1994 <br /> <br />Gunnison River at Crystal Dam and Gunnison River near <br />Grand Junction core station natural flow estimates in <br />order to retain mass balance; <br /> <br />Agricultural Consumptive Use Rates: <br /> <br />Backqround: <br /> <br />Inflow development utilized Colorado River Simulation <br />system (CRSS) and Colorado River System Consumptive Uses <br />and Losses Report (CU&L) irrigation depletion rate <br />estimates. Rates developed for the Upper Uncompahgre, <br />Lower Uncompahgre, Smith Fork/North Fork, and Lower <br />Gunnison areas of the Gunnison basin were used for <br />expanded network flow development. <br /> <br />Irrigated acreage and depletion rates as used in <br />deriving natural inflow estimates for the "expanded <br />network" (Uncompahgre, Smith Fork/North Fork, and Lower <br />Gunnison mainstem) portion of the model were provided to <br />Hydrosphere. Irrigated acreage estimates and depletion <br />rates were used to define agricultural demands in the <br />model. <br /> <br />the irrigated acreage figures were considered the <br />best estimates available, pending completion of the GIS <br />irrigated acreage inventory being done by the Colorado <br />State Engineer's Office in conjunction with Reclamation's <br />Denver Office Remote Sensing Branch. <br /> <br />at the time that depletion rates were provided to <br />Hydrosphere, it was noted that these rates include <br />adjustments for incidental use and shortage conditions. <br />Inclusion of such adjustments was appropriate for use in <br />natural flow development, but should not be inc}uded in <br />modeling irrigation demands where it is "up to the model" <br />to compute shortages for varying demand and hydrology <br />conditions. These rates were used in Hydrosphere's Beta <br />test version of the model as place holders to facilitate <br />the debugging process. <br />The rates provided to Hydrosphere are listed in Table ~. <br />Plots of annual ( '52-' 90) rates for the Upper <br />uncompahgre, Lower Uncompahgre, Lower Gunnison, and Smith <br />Fork/North Fork areas are shown on Figures 1-4. <br /> <br />Hydrosphere has requested depletion rates with <br />incidental use and shortage adjustments backed out (base <br />Blaney-Criddle c.u. rates) and/or supporting information <br />covering cropping pattern, climate data, incidental use, <br /> <br />10 <br />