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<br />WEIGIfi'ED M:mHLY S1ILINlTIES Kr <br />SEIECl'ED rolDRAOO RIVER Sl'ATIONS 1/ <br />AND ~ 12-MJNIH NIB-IMPERIAL FLCM-WEIGIfl'E[) SALlliI'lY DIFFEREN1'IAL <br />(in parts per million) <br /> <br /> Bela-.r Bela-.r Palo Verde At At Northerly Inter- ~ . <br /> Hoover D3:rn Parker D3:rn Canal Near Blvthe I=erial DaIII national EooJl:3ar.l 12-Month <br /> 5-Yeary 5-Yeary 5-Year y 5-Y~ 5-Y~ FlCM-Wtd. "J/ <br /> Avg. Avg. Avg. Avg.'Y Avg.'Y Differential <br /> Month 1974-78:98:1999 1974-78:98:1999 1974-78:98:1999 1974-78:1998:1999 1974-78:1998:1999 1998 1999 <br /> Jan. 690 613 591 709 751 913 665 687 1,041 698 730 57.4 44.6 <br /> Feb. 675 610 610 706 732 835 629 701 998 641 856 44.1 57.8 <br />I March 684 610 583 699 727 805 627 710 925 676 782 41.4 60.3 <br /><l' April 680 602 585 700 714 801 651 684 892 736 773 42.2 59.5 <br />I <br /> May 677 595 575 698 709 822 656 705 962 771 795 47.2 55.9 <br /> June 678 607 571 695 712 812 643 680 956 742 778 49.2 54.5 <br /> July 682 599 688 709 797 663 909 756 50.4 <br /> August 690 602 686 706 800 690 907 786 52.5 <br /> Sep. 672 619 686 737 815 652 952 692 53.9 <br /> Oct. 680 611 689 739 854 679 1,070 760 54.4 . <br /> Nov. 682 582 692 746 897 684 1,010 717 51.5 <br /> Dec. 681 605 702 731 877 647 999 659 42.9 <br /> <br />General Notes: <br /> <br />1/ Salinities based on 'sum of amstituents' except for Below Hoover Dam wch are based on pan residue <br /> <br />y 5-Year averages are arithmetic <br /> <br />"J/ 12-IlOnth fla-.r--weighted differential between NIB arrl :rnperial through IlDJ1th shown in left =lumn. <br />