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Q =0.55Q +1.8, P 0 where: Q =predicted discharge in cubic feet per second, and p (6) 0024'10 For the 6-year period in which the model is operated, mean monthly discharges were required for seven input nodes (fig. 1). Of these, observed data for the entire period were available for four input nodes (table 1): Yampa River at Steamboat Springs (09239500), Foidel Creek near Oak Creek (09243800), Middle Creek near Oak Creek (09243700), and Fish Creek near Milner (09244100). Partial record was available for Fish Creek near Milner from 1977 to 1980, so missing records were estimated by correlation with node 13 and the record extended. In addition, data for the Elk River station required only an extrapolation from the data for station Elk River near Clark to the outlet. This leaves only the input nodes on Trout Creek and Grassy Creek for which no streamflow information is available and must be estimated (fig. 1). As part of the calibration process, streamflow data also must be available for output nodes: Middle Creek at mouth, Fish Creek at mouth, near Milner (402530106585700), Trout Creek above Milner (402720106591200), and Yampa River below diversion, near Hayden (09244410). As shown in table I, gaged data are available in the period for Fish Creek at mouth, near Milner (402530106585700) and Yampa River below diversion, near Hayden (09244410). In addition, the location of the output node for Middle Creek at mouth (node 15) is directly downstream from the two streamflow gages, Middle Creek near Oak Creek (09243700) and Foidel Creek at mouth, near Oak Creek (09243900). Thus, data for output node 15 is assumed to be a direct summation of these two gages. DATA ESTIMATION Surface Water No continuous discharge data were available for input node 1, Trout Creek near Oak Creek (401816107011000). In 1981, several instantaneous- discharge measurements were made at this site in conjunction with a water~ quality sampling program (Maura, 1983). These discharge values were used to develop a linear relationship with the streamflow-gaging station, Bear River near Toponas (09236000) to estimate mean monthly discharge at Trout Creek (node 1). The Bear River drainage is the next drainage to the south of Trout Creek and has elevations, drainage areas, and geology similar to Trout Creek near Oak Creek. The equation to predict mean daily discharge at Trout Creek (node 1) from the gaged data for Bear River is: Q =observed discharge in cubic feet per second, o and the standard error of estimate is 5.046 ft3/s. These mean daily values were summed, and mean monthly discharge was determined for each month for Trout Creek (node 1). 10