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<br /> Annual Dissolved-Solids Loads Based on the mean annual loads for 1970-93
<br /> in table l, about 46 percent of the dissolved-solids
<br /> The annual dissolved-solids loads for water load of about 3.32 million tons in the Colorado River
<br />N years 1970-93 for the four gaging stations in the near the State line (station 09163500) was in the
<br />l\" Grand Valley area are listed in table 1. Also includ- Colorado River upstream from the Grand Valley
<br />l\j ed in table I are the mean, standard deviation, and (stations 09095500 plus 09105000), 38 percent came
<br />N 95-percent confidence interval of the mean for the from the Gunnison River (station 09152500), and
<br /> annual loads. If the population is normally distributed, 16 percent was from the Grand Valley. Considerable
<br /> the true population mean will be within the 95-percent variation in annual loads between years is evident for
<br /> confidence interval on average 95 percent of the time each station. Some of the variability is related to
<br /> (Helsel and Hirsch, 1992). streamflow, because years with the largest dissolved-
<br /> Table 1. Annual dissolved-solids loads for four gaging stations in the Grand Valley area and the annual Grand'
<br /> Valley dissolved-solids load, water years 1 ~70-93
<br /> [Annual loads in tons; upper and lower 95-percent confidence intervals (95% CI) are the upper and lower 95% CI of the mean]
<br /> Station Station Station Station Grand Valley
<br /> Water year 09095500 09105000 09152500 09163500 dissolved..
<br /> solids load
<br /> 1970 1,587,000 68,100 1,579,000 3,772,000 538,000
<br /> 1971 1,616,000 65,100 1,391,000 3,635,000 563,000
<br /> 1972 1,454,000 53,100 1,052,000 3,473,000 914,000
<br /> 1973 1,518,000 71,600 1,323,000 3,711,000 798,000
<br /> 1974 1,473,000 54,800 1,435,000 3,536,000 573,000
<br /> 1975 1,529,000 58,300 1,330,000 3,284,000 367,000
<br /> 1976 1,404,000 46,700 1,294,000 3,010,000 265,000
<br /> 1977 1,183,000 22,800 955,000 2,343,000 182,000
<br /> 1978 1,364,000 48,000 1,026,000 2,964,000 526,000
<br /> 1979 1,509,000 79,200 1,446,000 3,450,000 416,000
<br /> 1980 1,523,000 60,500 1,225,000 3,195,000 387,000
<br /> 1981 1,157,000 44,700 877,000 2,729,000 650,000
<br /> 1982 1,279,000 49,700 1,225,000 3,103,000 549,000
<br /> 1983 1,779,000 68,900 1,558,000 4,014,000 608,000
<br /> 1984 2,053,000 81,800 1,758,000 4,577,000 684,000
<br /> 1985 2,014,000 81,700 1,489,000 4,258,000 673,000
<br /> 1986 2,004,000 79,100 1,464,000 4,204,000 657,000
<br /> 1987 1,534,000 59,900 1,534,000 3,594,000 466,000
<br /> 1988 1,352,000 52,900 1,043,000 2,918,000 470,000
<br /> 1989 1,232,000 48,100 880,000 2,768,000 608,000
<br /> 1990 1,101,000 42,300 857,000 2,317,000 317,000
<br /> 1991 1,218,000 47,400 1,064,000 2,718,000 389,000
<br /> 1992 1,185,000 46,000 1,160,000 2,780,000 389,000
<br /> 1993 1,501,000 60,000 1,402,000 3,407,000 444,000
<br /> Annual mean 1,482,000 57,900 1,265,000 3,323,000 518,000
<br /> Standard deviation 268,000 14,500 252,000 592,000 169,000
<br /> Upper 95% CI 1,589,000 63,700 1,366,000 3,560,000 586,000
<br /> Lower 95% CI 1,375,000 52,100 1,164,000 3,086,000 450,000
<br />
<br />8 Trend Analysis 01 Selected Water-Quality Data Associated With Sallnlty-Control Prolects In the Grand Valley,
<br />In the Lower Gunnison River Basin, and at Meeker Dome, Western Colorado
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