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<br /> WEIGHl'ED M:lNIHLY S1ILINITIES AT Y <br /> SElECl'ED (X)lDR1\IX) RiVER STATIOOS <br /> AND RUNNING 12-MJNIH NIB-IMPERIAL F'I.CM-WEIGHI'ED SALINI'lY DIFFERENl'IAL <br /> (in parts per million) = <br /> = <br /> ..... <br /> ..... <br /> l'.u~ <br /> ~ <br /> BelC10l BelOW' Palo Verde At At Northerly Inter- RI.1nni.Iq <br /> Hoover Dam Parker Dam Canal Near Blvthe Tmno>rial Dam national Baurdarv 12-Month ~ <br /> 5-Year 5-Yeary 5-Year y 5-Y~ 5-Yeaz F1aw-wtd. <br /> Avg.Y Avg. Avg. Avg. Avg.Y Differential3 <br />Month 1974-78:97:1998 1974-78:97:1998 1974-78:97:1998 1974-78:1997:1998 1974-78:1997:1998 1997 1998 <br />Jan. 690 655 613 709 668 751 696 913 746 665 1,041 826 698 70.6 57.4 <br />Feb. 675 649 610 706 660 732 670 835 687 629 998 733 641 53.6 44.1 <br />I March 684 646 610 699 659 727 675 805 677 627 925 742 676 50.6 41.4 <br />";' April 680 640 602 700 650 714 664 801 676 651 892 766 736 54.4 42.2 <br />May 677 635 595 698 639 709 641 822 703 656 962 760 771 58.2 47.2 <br />June 678 635 607 695 635 712 631 812 682 643 956 776 742 66.1 49.2 <br />July 682 634 599 688 644 709 647 797 680 663 909 764 756 73.7 50.4 <br />August 690 629 602 686 634 706 645 800 668 690 907 706 786 68.7 52.5 <br />Sep. 672 628 619 686 616 737 640 815 691 652 952 717 692 62.8 53.9 <br />Oct. 680 627 611 689 624 739 647 854 717 679 1,070 843 760 64.8 54.4 <br />Nov. 682 626 571 692 634 746 655 897 743 1,010 879 66.9 <br />Dec. 681 625 702 731 877 767 999 890 68.7 . <br /> <br />General Notes: <br /> <br />y Salinities based on 'SlDn of =nstituents' except for BelC10l Hoover Dam which are based on pan residue <br /> <br />y 5-Year averages are arithmetic <br /> <br />11 12-month flOW'-weighted differential between NIB ani Inperial through month shown in left =lumn. <br />