10254730 ALAMO RIVER NEAR NILAND, CA
LOCATION.-Lat 33°11'56", long 115°35'46", in SW 1/4 NW 1/4 sec.23, T.11 S., R.13 E., Imperial County,
Hydrologic Unit 18100200, on left bank, 1.0 mi upstream from mouth, and 4.5 mi southwest of Niland.
PERIOD OF RECORD.-January 1943 to September 1960 (monthly discharge only, published in WSP 1743), October 1960 to
current year.
GAGE.-Acoustic-velocity meter and water-stage recorder. Elevation of gage is 220 ft below sea level, from
topographic map. Prior to Oct. 1, 1986, at site 0.4 mi downstream at different datum.
REMARKS.-Records fair. Discharge mainly represents seepage and return flow from irrigated areas. See schematic
diagram of Salton Sea Basin.
EXTREMES FOR PERIOD OF RECORD.-Maximum daily discharge, 4,500 ft3/s, Aug. 17, 1977, estimated by
Imperial Irrigation District; minimum daily, 288 ft3/s, Jan. 2, 1966, Dec. 15, 1984.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 974 849 635 707 641 895 1040 1180 990 883 729 755
2 974 883 690 607 695 937 1140 1220 954 893 660 745
3 965 847 666 606 722 1000 1120 1080 927 888 658 740
4 965 846 623 624 748 946 906 1140 954 860 665 745
5 880 908 637 679 806 928 641 1120 927 860 763 753
6 905 890 629 717 728 990 708 1040 879 851 754 734
7 910 868 582 726 667 972 858 1060 853 918 781 719
8 946 834 607 798 612 909 917 1140 868 886 791 649
9 992 723 623 835 570 936 970 1070 876 963 750 759
10 1010 720 576 746 571 979 1020 980 865 954 760 827
11 937 752 614 630 547 979 1010 971 872 900 722 843
12 928 840 637 659 579 961 934 1060 882 816 703 844
13 883 810 671 657 599 926 997 1060 888 1100 753 771
14 919 774 600 678 632 915 1050 1070 936 1060 757 754
15 888 805 637 697 647 879 1060 1080 954 801 770 779
16 889 732 696 714 669 924 1050 1080 900 727 746 841
17 885 694 701 754 750 986 1080 981 909 707 764 850
18 874 700 680 700 775 1070 1050 999 963 669 797 874
19 864 719 705 706 836 1030 988 1020 990 644 797 896
20 830 761 709 758 820 1030 1040 1040 945 664 721 822
21 863 750 723 692 809 994 1070 1050 918 776 781 832
22 910 700 773 691 839 950 1040 1060 881 800 766 963
23 919 642 800 689 841 994 1100 1050 900 805 757 1080
24 876 684 792 669 910 1050 1100 999 889 830 761 1070
25 873 732 653 661 956 1020 1100 981 909 829 763 936
26 755 719 471 691 974 1060 1120 981 918 832 826 834
27 773 644 509 720 983 1020 1100 954 886 770 802 813
28 819 638 636 710 974 1000 1090 918 845 824 731 834
29 831 622 691 676 --- 994 1140 945 858 877 707 820
30 890 593 711 716 --- 959 1160 900 886 876 681 820
31 905 --- 729 740 --- 950 --- 936 --- 806 716 ---
TOTAL 27832 22679 20406 21653 20900 30183 30599 32165 27222 26069 23132 24702
MEAN 898 756 658 698 746 974 1020 1038 907 841 746 823
MAX 1010 908 800 835 983 1070 1160 1220 990 1100 826 1080
MIN 755 593 471 606 547 879 641 900 845 644 658 649
AC-FT 55200 44980 40480 42950 41460 59870 60690 63800 53990 51710 45880 49000
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 944 761 642 641 756 976 1090 964 827 831 844 900
MAX 1159 851 792 834 970 1144 1272 1182 981 1027 1278 1271
(WY) 1964 1991 1973 1972 1964 1963 1980 1975 1963 1963 1977 1962
MIN 742 616 416 396 495 734 797 684 646 636 656 667
(WY) 1986 1966 1986 1978 1993 1987 1965 1964 1964 1985 1986 1992
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1961 - 1999
ANNUAL TOTAL 316588 307542
ANNUAL MEAN 867 843 848
HIGHEST ANNUAL MEAN 991 1963
LOWEST ANNUAL MEAN 680 1986
HIGHEST DAILY MEAN 1260 Mar 27 1220 May 2 4500 Aug 17
1977
LOWEST DAILY MEAN 393 Feb 23 471 Dec 26 288 Jan 2
1966
ANNUAL SEVEN-DAY MINIMUM 422 Feb 19 587 Feb 8 323 Dec 27
1965
ANNUAL RUNOFF (AC-FT) 628000 610000 614300
10 PERCENT EXCEEDS 1130 1050 1110
50 PERCENT EXCEEDS 883 841 841
90 PERCENT EXCEEDS 592 651 606
USGS Water Resources of California
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