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Table 1. --Hydraulic geometry relations at station 09260050 Yampa River <br />at Deerlodge Fark <br />[W, channel width in feet; D, mean depth in feet; u, mean velocity in feet <br />per second; Af, cross-sectional area in square feet; Q, instantaneous <br />discharge in cubic feet per second; R2, coefficient of determination; <br />SE, standard error of estimate in percent; n, sample size] <br />Regression equation R2 SE n <br />W = 178 Qo,oss_____________________ 0.18 12 35 <br />D = 0.0227 Qo,s4___________________ .9b 13 35 <br />u = 0.251 Qo.30-------------------- .91 9 35 <br />Af = 4.04 Qo.~o--------------------- .98 10 35 <br />Water surface slope varied about a mean of 0.00069, with standard deviation of <br />0.00014 and n of 12. <br />at the Maybell and Lily gages. Linear regression of log-transformed discharge <br />data resulted in the equation: <br />QD = 1.74 Q~o.94, R2 = 0.98, SE = 18 , <br />where: <br />QD = daily mean discharge of Yampa River at Deerlodge Park, in <br />ft3/s, <br />Q~ = sum of daily mean discharger of Yampa River near Maybell <br />and Little Snake River near Lily, in ft3/s, <br />R2 = coefficient of determination, and <br />SE = standard error of estimate, in percent. <br />The regression equation gives about the same answer as simply summing the <br />upstream discharges when the discharge at Deerlodge Park is about 10,000 <br />ft3/s. However, when the discharge at Deerlodge Park is near 400 ft3/s, the <br />equation overestimates discharge by about 25 percent. Consequently, historic <br />discharges at the Deerlodge Park gage were estimated by summing historic <br />discharges of the Yampa River near Maybell gage and the Little Snake River <br />near Lily gage. The historic hydrograph of mean daily discharges for the <br />Yampa River at Deerlodge Park is presented in figure 5. <br />Water years 1982 and 1983 were characterized by high peak discharges, and <br />above-average annual streamflows. The 1982 instantaneous peak discharge at <br />9 <br />