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<br />.' <br /> <br />- <br /> <br />., <br /> <br />et <br /> <br />-- <br /> <br />. <br />\' <br /> <br />. <br /> <br />0726 <br /> <br />DESCRIPTION OF THE MODEL <br /> <br />The model used in this study has been described in earlier reports <br /> <br />(Taylor and Luckey, 1974; Jenkins, 1968a, 1968b). Briefly, the model is <br /> <br />a lumped parameter accounting model that describes the temporal and spatial <br /> <br />distribution of both surface and ground water based on a functional <br /> <br />relationship between stress on the aquifer and response by the stream. <br /> <br />The stream-aquifer system is subdivided into 27 reaches perpendicular to <br /> <br />the river and 10 bands on each side parallel to the river. Ten response <br /> <br />functions are necessary to describe the interrelationship between the <br /> <br />river and the aquifer. <br /> <br />The model simulates a 25-year period from 1949 through 1973 using <br /> <br />I-month calculation periods. The following data are needed for the model: <br /> <br />Water supplY: <br /> <br />1. Monthly streamflow at Pueblo. <br /> <br />2. Monthly tributary inflow, <br /> <br />3. Monthly imported water for several canals. <br /> <br />4. Initial contents of John ~artin Reservoir. <br /> <br />5. l10nthly precipitation by reach. <br /> <br />6. Initial ground-water storage by reach and side of the river. <br /> <br />7. Ground-water inflow to each reach. <br /> <br />l'ater losses: <br /> <br />1. Evapotranspiration from the shallow water table by month <br /> <br />and reach. <br /> <br />2. Consumptive use of applied water by reach. <br /> <br />3. Monthly municipal use. <br /> <br />8 <br />