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<br /> 001923 <br /> BAUCH & SPAHR: SALINITY TRENDS IN SURFACE WATERS OF THE COLORADO RIVER BASIN 643 <br />(Na+), potassium (K+), silica (Si), chloride (0-), sulfate centration. SUM consists of the major ions plus other constit- <br />(SO~-) and C, as carbonate equivalent (Liebermann et a!., uents, such as dissolved iron and dissolved lead if they are <br />1987). This estimate of periodic dissolved-solids concentration present in the water. Finally, dissolved solids, residue on evap- <br />is referred to as calculated dissolved solids (CDS). When CDS oration at 1800C (ROE), is used when CDS and SUM are <br />is not available, dissolved solids, the sum of constituents absent. According to Liebermann et a!. (1987), the ROE <br />(SUM) from NWIS, is used to estimate dissolved-solids con- method is considered the least reliable for dissolved-solids <br />Table 2. Annual dissolved-solids loads for sites in the Upper Colorado River Basin in Colorado, water years 1970 to 1993. Number <br />after site name refers to site number in Fig. 1. Loads in tons per year; statistical summaries were calculated nsing unrounded loads; <br />loads shown in the table are rounded values; data for Colorado River near Cameo and Gunnison River at Grand Junction from <br />Butler (1996). <br /> Colorado <br /> Alva B. Adams River at Hot Muddy Creek Colorado River Colorado River <br /> Tunnel at East Sulphur at Kremmling Rock Creek Eagle River at near Dotsero above Glenwood <br />Water year Portal (I) Springs (2) (3) at Crater (4) Gypsum (5) (6) Springs (7) <br />1970 20 380 176 300 S46 000 610 100 <br />1971 30 010 194 000 577 000 643700 <br />1972 14 340 173 300 427 400 527 900 <br />1973 23020 177 000 465 500 559300 <br />1974 24 840 159 200 478 600 606 100 <br />1975 15 280 153 800 450000 581300 <br />1976 U170 137 800 402 400 50S 600 <br />1977 9394 116400 299 800 39S 000 <br />1978 16 150 141 700 395 700 526 000 <br />1979 16 370 157 800 416 000 S87 400 <br />1980 5885 16 780 152000 411 400 S89 600 <br />1981 9540 8650 124 200 292 500 436 700 <br />1982 9752 U61)O 147200 378 000 563 500 <br />1983 6548 26 210 191900 569 SOO 644 400 <br />1984 7156 37 900 251 300 629 300 745 600 <br />1985 10 560 2161)0 206 800 465 700 6ff1600 <br />1986 10 460 27 280 47 520 3035 184 200 492 700 710000 <br />1987 9744 13320 29 500 1848 147000 341 600 526 800 <br />1988 10 400 14 170 26930 1806 131300 346 000 556 900 <br />1989 11160 11240 24160 1714 U7000 305 400 466 400 <br />191)0 9022 10 430 21 600 1164 UO 700 281100 461300 <br />1991 8155 13 020 27360 1495 132500 302 300 479 000 <br />1992 8003 11 370 19 040 1201 140 900 299 000 480 700 <br />1993 8431 18 380 29 870 1524 151100 393 SOO 539 100 <br />Mean annual 8915 17710 28 240 1723 158 100 415 300 5S7 200 <br />SD 1610 7354 8656 588 31 660 99 280 87 7l)f) <br /> East River <br /> Roaring Fork Colorado Taylor River at confiuence Uucompagbre Gunnison River <br /> river at mouth River near at Almont with Taylor River at Delta at Grand <br />Water year (8) Cameo (9) (10) River (11) (U) Junction (13) <br />1970 357700 1 587 000 27160 51 370 411 300 1 579 000 <br />1971 348 900 1 616000 32 460 48 080 356 100 1 391 000 <br />1m 307 300 1 4S4 000 27 656 3461)0 325 300 1 052 000 <br />1973 344 900 1 518 000 20700 42 740 420 000 1 323 000 <br />1974 311 900 1 473 000 19 450 33 520 340 000 1435 000 <br />1975 321 400 1 529 000 20 750 45 090 358 SOO 1 330 000 <br />1976 21)0100 1404 000 23 660 33 560 314 600 1 294 000 <br />1977 208 200 1183 000 U630 17 520 262 400 955 000 <br />1978 303 900 1364 000 21 060 56 S40 295 SOO 1 026 000 <br />1979 340 000 1 509 000 27 520 54 260 3U SOO 1446 000 <br />1980 323 700 1 523 000 31 040 53 080 302 SOO 1 225 000 <br />1981 258 000 1157 000 17270 26 350 262 800 877 000 <br />1982 330 700 1279 000 21 950 49 270 364 300 1225 000 <br />1983 358 700 1 779 000 26 230 56 400 397 900 1 558 000 <br />1984 411 000 2 053 000 3761)0 61870 466 400 1 758 000 <br />1985 391300 2014000 35 580 54 770 401 000 1 489 000 <br />1986 384 200 2 004 000 35 200 6S 260 336 800 1 464 000 <br />1987 316 600 1 534 000 28 380 46 S40 358 700 1 534 000 <br />1988 257 400 1 352 000 17580 31 5SO 247 300 1 043 000 <br />1989 254 200 1232 000 18 440 3521)0 235 SOO 880 000 <br />191)0 228 600 1101 000 1741)0 27 300 261 600 857 000 <br />1991 273 100 1 218 000 22UO 38 340 293 400 1 064 000 <br />1992 253 600 1185 000 19 030 346 800 1160 000 <br />1993 358 100 1 501 000 36S 100 1 402 000 <br />Mean annual 313 900 1 482 000 24 350 43 380 334 800 1 265 000 <br /> (1976-1992) (1976-1991) <br />SD 52 700 267 600 6754 U080 59 310 2:;2 000 <br />