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<br />fHl2?~14 <br /> <br /> 1,000,000 <br /> 900.000 <br /> 800,000 <br /> 700,000 <br /> 600.000 <br /> 500,000 <br />f- <br />UJ 400,000 <br />UJ <br />~ <br />Li.J 300,000 <br />0: <br />U <br /><! 200,000 <br />~ <br />ro 100,000 <br />g <br /> <br />EARLY APRIL <br /> <br />REGRESSION DATA <br />~ 95 percent confidence interval (upper) <br />Regression line <br />~ 95 percent confidence interval (lower) <br />r2 Coefficient of determination <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />UJ 0 <br />(!J <br />0: <br /><! <br />:c <br />u <br /><f) <br />(5 1,000,000 <br />::;; 900,000 <br /><! <br />UJ <br />0: <br />f- 800,000 <br /><f) <br />--' <br /><! 700,000 <br />:J <br />Z <br />Z 600.000 <br /><! <br /> 500,000 <br /> 400,000 <br /> 300,000 . <br /> 200,000 . <br /> 100,000 <br /> 0 <br /> 0 2 4 <br /> <br />. <br /> <br />. <br /> <br />. . <br /> <br /> <br />. <br /> <br />.- <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Qa = 15,414 (water content) + 136,058 <br />r2 = 0.52 <br /> <br />EARLV MAV <br /> <br /> . . <br /> . . . <br /> . <br />. <br /> . <br />.. . <br /> . . . <br />. . <br />. <br /> <br /> <br />Qa = 10,971 (water content) + 245,277 <br />r2 = 0.52 <br /> <br />6 8 10 12 14 16 18 20 22 24 26 28 30 32 <br />WATER CONTENT OF SNOWPACK. IN INCHES <br /> <br />Figure 7, Relation of annual stream discharge (Oa) in the White River at site 3A (Oa at site 1 plus Oa at site 2) to <br /> <br />early April and early May measurements of snowpack at the Burrow Mountain snow course, water years 1952-88 <br />(snowpack data from the U.S. Soil Conservation Service, written commun., 1988). <br /> <br />. <br /> <br />Loads <br /> <br />Annual loads of suspended sediment transported <br />by the White River at sites 1-4 for water years 1975-88 <br />and at sites 5 and 6 for water years 1983-88 were esti- <br />mated from least-squares regressions that related <br />instantaneous suspended-sediment load to stream dis- <br />charge. Instantaneous suspended-sediment load (Ls)' <br />in tons per day, is a function of instantaneous stream <br />discharge (Q), in cubic feet per second, sediment con- <br />centration (C), in milligrams per liter, and the conver- <br />sion constant 0.0027. Instantaneous suspended- <br />sediment load is calculated as follows: <br /> <br />Ls = (0.0027)QC. <br /> <br />(I) <br /> <br />One to three regressions were developed for each <br />site. The regressions related log transformations of <br />instantaneous suspended-sediment loads with log <br />transformations of instantaneous stream discharge for <br />water years 1975-88. The regression is expressed as: <br /> <br />log Ls = a + b log Q, <br /> <br />(2) <br /> <br />where (a) and (b) are regression coefficients. <br /> <br />The data were reviewed and grouped for three <br />hydrologic events as follows: (1) Rising and peak <br />streamflows during spring and summer from snowmelt <br /> <br />SEDIMENT TRANSPORT 15 <br /> <br />L "'- <br />