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<br />WEIGHI'ED MJNlliLY SALmITIES AT <br />SElECl'ED OJIDRAIXl RIVER STATIONS 1/ <br />AND RUNNING 12-MJNTH NI&- IMPERIAL FLCM-WEIGHI'ED SALlliITY DIFFERENTIAL <br />(in parts per million) <br /> <br /> Below Below Palo Verde At At Northerly Inter- Running <br /> Hoover Dam Parker Dam Canal Near Bl vthe lInPerial Dam national Boundal:v 12-Month I <br /> 5-Yeary 5-Yeary 5-Year y 5-Y~ 5-Y~ Flow-Wtd. <br /> Avg. Avg. Avg. Avg.Y Avg.Y Differential <br /> Month 1974-78:99:2000 1974-78:99:2000 1974-78:99:2000 1974-78:1999:2000 1974-78:1999:2000 1999 2000 <br /> Jan. 690 591 559 709 591 604 751 598 634 913 687 688 1,041 730 838 44.6 87.6 <br /> Feb. 675 610 571 706 579 568 732 609 576 835 701 666 998 856 806 57.8 86.5 <br />I March 684 583 586 699 604 576 727 616 586 805 710 650 925 782 743 60.3 88.6 <br />~ April 680 585 609 700 614 573 714 625 589 801 684 622 892 773 733 59.5 91.5 <br /> May 677 575 607 698 595 584 709 618 596 822 705 646 962 795 768 55.9 95.3 <br /> June 678 571 584 695 580 586 712 599 597 812 680 643 956 778 758 54.5 97.3 <br /> July* 682 604 573 688 597 597 709 610 550 797 678 653 909 732 759 51.6 101. 8 <br /> August 690 604 566 686 586 706 592 800 698 664 907 822 788 52.0 102.7 <br /> Sep. 672 581 543 686 564 737 592 815 643 672 952 692 791 53.1 109.6 <br /> Oct. 680 561 689 599 739 600 854 620 1,070 688 51.9 <br /> Nov. 682 562 692 600 746 607 897 674 1,010 770 57.8 I <br /> Dec. 681 563 702 580 731 604 877 725 999 848 77.7 <br /> * 'Ihere appears to be an e=r for July 2000 for Palo Verde Canal near Blythe. USBR is examining the data. <br /> <br />General Notes: <br /> <br />1/ Salinities based on I sum of constituents I except for Below Hoover Dam which are based on pan residue <br /> <br />y 5-Year averages are arithmetic <br /> <br />1/ 12-rnonth flow-weighted differential between NIB and Imperial through month shown in left column. <br />