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<br />WEIGIfl'E[) MJNIHLY SALINITIES Kr <br />SErECI'ED OOIDRAOO RIVER smTIONS 1/ <br />AND RUNNrnG 12-M:lNIH NIB-IMPERIAL F'LCM-WEIGIfl'E[) SALINITY DIFFERENl'IAL <br />(in parts per million) <br /> <br /> Below Below Palo Verde At At Northerly Inter- Rllr1ni.n3' . <br /> Hoover Dam Parker Dam Canal Near Bl vthe In1Derial Dam national Boorrlarv 12-fb1th <br /> 5-Yearl/ 5-Year 5-Year l/ 5-Y~ 5-Y~ Flc::M-Wtd.;V <br /> Avg. Avg.Y Avg. Avg.Y Avg. 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. 690 613 591 709 623 591 751 609 598 913 665 687 1,041 698 730 57.4 44.6 <br /> Feb. 675 610 610 706 615 579 732 624 609 835 629 701 998 641 856 44.1 57.8 <br /> March 684 610 583 699 607 604 727 612 616 805 627 710 925 676 782 41.4 60.3 <br /> April 680 602 585 700 610 614 714 613 625 801 651 684 892 736 773 42.2 59.5 <br />I May 677 595 575 698 611 595 709 619 618 822 656 705 962 771 795 47.2 55.9 <br />'" <br />I June 678 607 571 695 614 580 712 620 599 812 643 680 956 742 778 49.2 54.5 <br /> July 682 599 604 688 590 597 709 600 610 797 663 678 909 756 732 50.4 51.6 <br /> August 690 602 604 686 588 706 601 800 690 698 907 786 822 52.5 52.0 <br /> Sep. 672 619 581 686 587 737 597 815 652 643 952 692 692 53.9 53.1 <br /> Oct. 680 611 561 689 592 739 597 854 679 620 1,070 760 688 54.4 51.9. <br /> Nov. 682 582 692 600 746 605 897 684 1,010 717 51.5 <br /> Dec. 681 605 702 581 731 596 877 647 999 659 42.9 <br /> <br />General Notes: <br /> <br />1/ Salinities based on 'sum of constituents' except for Below Hoover Dam which are based on pan residue <br /> <br />l/ 5-Year averages are arithmetic <br /> <br />;v 12-IOOnth flow-weighted differential between NIB am Imperial thrl:u3h m::mth shown in left =lumn. <br />