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<br />FI <br />t~: <br />2'f CHAPTER II PIAN FORMULATIOO <br />" <br />~ perimeter versus discharge relationship developed for the Lower Gunnison Basin <br />":," unit. Ditch capacity was assumed to vary linearly from headgate to terminus. <br />'. <br />~':. Capacity at the terminus was assumed to be 25 percent of the headgate <br /> capaci ty . <br />Fl <br />oj Table 5 <br />d <br /> Monthly TOS concentrations for the uncompahgre River <br />r~ at Colona <br /> (mg/L) <br />'::"~ Year Jan Feb Mar ~r ~~ Jun Jul Aug se~ Oct Nov Dec <br /> 1961 698 606 335 5 218 394 47 44 457 550 614 <br />E.~ 1962 648 633 623 358 276 277 309 489 601 576 605 659 <br />LJ 1963 642 628 560 408 290 438 543 530 522 582 578 611 <br /> 1964 646 602 650 373 205 215 405 435 582 649 665 636 <br />~f! 1965 682 682 554 552 578 <br />;~~ 1966 606 620 491 299 256 314 472 557 652 701 683 673 <br />~. -~ <br />~~ 1967 60l 448 40l 398 479 574 662 691 682 <br /> 1968 22l 255 397 458 555 682 687 704 <br />i:"l! 1969 694 667 627 393 247 277 336 441 523 499 506 533 <br />.':.:~ <br />~~ 1970 581 622 655 465 215 284 374 422 360 475 519 567 <br />1971 614 635 473 26l 282 282 390 532 513 580 585 594 <br />~<'! 1972 617 613 452 367 256 273 471 614 578 545 58l 595 <br />1973 622 660 701 385 200 184 202 501 571 619 653 683 <br />f:,{ 1974 737 782 753 486 324 322 387 573 655 659 688 690 <br /> 1975 711 719 567 443 311 234 264 371 556 671 644 603 <br />~?} 1976 605 635 62l 450 254 274 438 514 640 611 630 643 <br />~ .'~ 1977 659 686 679 572 38l 417 593 577 506 596 659 673 <br />, , <br />t:"-i 1978 699 688 643 337 291 253 354 522 642 710 72l 695 <br /> 1979 678 438 286 24l 291 436 613 669 636 619 <br />:,'."0 1980 619 450 327 274 230 218 313 589 625 63l 609 655 <br />t :.; <br />,,"':1 1981 705 714 563 382 269 271 451 554 580 521 512 581 <br /> 1982 64l 639 492 256 24l 222 286 300 304 398 512 529 <br />~:,.:; 1983 549 682 49l 290 336 409 348 508 <br />f{ 1984 673 623 296 280 227 142 18l 279 325 529 <br />".:1; 1985 466 329 45l 260 175 l88 244 380 439 547 585 566 <br /> 1986 645 582 489 403 219 222 282 415 439 441 494 564 <br />L~ N 23 23 24 24 25 25 25 24 23 24 25 25 <br />~-;.! <br />lJ Mean 641. 7 630.3 550.8 370.1 264.4 273.l 368.2 480.5 546.2 586.0 594.4 612.1 <br />, <br />t" Std 59.6 90.3 122.7 85.8 55.3 75.4 101.5 89.7 96.0 87.9 86.9 57.6 <br />,~.~ Min 466 329 296 255 175 142 l81 279 304 398 325 508 <br />\b Ma 737 782 753 572 401 438 593 614 662 710 72l 704 <br />r:'~ Monthly salt loading is the difference between the base flow <br />-'(,-':j <br />~ -~ concentration of 842 mg/L, which was assumed to remain constant, and the <br /> monthly surface water concentration which varied on a monthly basis. The six <br /> months of November through April were considered to be the winter water <br /> season. <br /> Winter seepage volumes of l,238 and 2,33l acre-feet were computed using <br /> the seepage rates of 0.17 and 0.32 feet per day, respectively. Salt loading <br /> for the winter months ranged from 200 mg/L for the month of January to <br /> 472 mg/L for the month of April. Associated annual salt reduction from <br /> eliminating winter flows is estimated at 464 tons using the 0.l7 foot per day <br /> seepage rate and 874 tons using the 0.32 foot per day seepage rate. <br /> 17 000943 <br />