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6 defined the effective flow for the Jensen gauge to b 3 pdtlhe effective flow for the gauge near Green River, Utah, to b 5 For this, he used suspended sediment rating curves and flow-duration curves with approximately 30 equal increments. Andrews [31 estimates of 11,500 ft3/s as the effective discharge for the Green near Jensen and 20,500 ft3/s as the effective discharge for the Green at Green River, Utah, were compared to effective discharges computed from the sand-load rating curves developed above. Mean daily flow data for the desired time period were used in the computation of the effective discharge for each site. For the time period s d data were categorized into 35 flow ranges of equal size. The ffective discharge is defined as the midpoint of the-£LQw range in which total sand load is maximized. Total sand load is the sum of the computed sand loads from the rating curves developed for the Jensen, Ouray, and Green River gauges) for all the discharges in a given flow range. Gauged flows for the Jensen gauge were used Refuge sites. The flows recorded at the Gr, for that location and adjusted for the site ment was based upon a linear correlation of the Geological Survey gauges near Ouray and 1963 through 1966 water years: for the Dinosaur Quarry and Ouray aen River, Utah, gauge were used below Willow Creek. This adjust- mean daily flow data reported for at Green River, Utah, for the Qw (at Ouray) _ -116.44 + 1.0285*Qw (at Green River) n = 1430 R2 = 0.9712 For this correlation, the flows were lagged 2 days. Each mean daily flow at Green River was matched with the mean daily flow that occurred 2 days prior at Ouray. For 1965-1987, the effective discharges at the Dinosaur Quarry and Ouray Refuge locations are approximately 11,900 ft3/s which agrees very closely with Andrews' results. For the same period the effective discharge is 19,200 ft3/s below Willow Creek and about 20,100 ft /s at Green River, Utah (see figure 13). As mentioned, the effective discharge is an(?, of the range of flows that inf1uPncP th chaRe of a zhannp? A"roximately 0 rcent of the sand load is transported over the followin dischar a ran a site: y N Q Dom _ .Tk S rnWA4 Dinosaur Quarry 1,700 ft3/s to 19,800 ft3/s VA_ICT? PA\)M) weep to ?,ocAs Ouray Refuge Below Willow Creek 1,700 ft3/s to 19,800 ft3/s 150 ft3/s to 29,200 ft3/s 2 ?o},ty? Green River, Utah , 2,100 ft3/s to 29,850 ft3/s So uutu1 These are broad ranges c overing an order of magnitude in terms of discharge. R???'r?-0i` These ranges cover about 90 percent of the flows measured at the Jensen gauge from 1964 to 1986 and ab out 90 percent of the flows measu red at the Green >,A4-nOf3 4-- River gauge from 1963 to 1987 (see figures 5 and 6). AA.46MI.UOU? - -1-4cSE =P? bAJJ 4r V