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r <br />4726 <br />DESCRIPTION OF THE MODEL <br />The model used in this study has been described in earlier reports <br />(Taylor and Luckey, 1974; Jenkins, 1968a, 1968b). Briefly, the model is <br />a lumped parameter accounting model that describes the temporal and spatial <br />distribution of both surface and ground water based on a functional <br />relationship between stress on the aquifer and response by the stream. <br />The stream- aquifer system is subdivided into 27 reaches perpendicular to <br />the river and 10 bands on each side parallel to the river. Ten response <br />functions are necessary to describe the interrelationship between the <br />river and the aquifer. <br />The model simulates a 25 -year period from 1949 through 1973 using <br />1 -month calculation periods. The following data are needed for the model: <br />Water supple <br />1. Monthly streamflow at Pueblo. <br />2. Monthly tributary inflow. <br />3. Monthly imported water for several canals. <br />4. Initial contents of John :Martin Reservoir. <br />5. Monthly precipitation by reach. <br />6. Initial ground -water storage by reach and side of the river. <br />7. Ground -water inflow to each reach. <br />Water losses <br />1. Evapotranspiration from the shallow water table by month <br />and reach. <br />2. Consumptive use of applied water by reach. <br />3. Monthly municipal use. <br />8 <br />