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Last update: Wednesday, 23-Feb-2005 09:45:47 EST
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Statistics of monthly and annual mean discharges
__________________________________________________________________________________________________________
Maximum Minimum Mean
______________________ ______________________ _____________________________________________
Water year Water year Standard Coeffi- Percentage
Month Discharge of Discharge of Discharge deviation cient of of annual
(ft3/s) occurrence (ft3/s) occurrence (ft3/s) (ft3/s) variation discharge
__________________________________________________________________________________________________________
October 2,070 1951 5.10 1934 471 439 0.93 8.43
November 1,650 1951 3.57 1934 456 368 0.81 8.16
December 1,500 1951 0.952 1934 453 339 0.75 8.11
January 1,420 1951 0.355 1934 466 356 0.76 8.35
February 1,340 1951 0.400 1934 461 351 0.76 8.26
March 1,400 1951 0.597 1936 423 326 0.77 7.58
April 1,200 1951 4.00 1936 332 299 0.90 5.95
May 1,620 1950 0.603 1933 483 442 0.92 8.65
June 2,020 1950 2.15 1933 571 481 0.84 10.2
July 1,840 1950 4.63 1934 534 432 0.81 9.57
August 1,460 1975 2.73 1936 469 388 0.83 8.40
September 1,710 1950 1.61 1934 464 413 0.89 8.31
Annual 1,290 1951 5.55 1936 469 330 0.70 100
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Monthly and annual flow duration, in cubic feet per second
______________________________________________________________________________________________________________________
Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
______________________________________________________________________________________________________________________
95 3.42 2.90 3.40 11.6 3.81 4.05 13.4 6.11 6.00 8.85 8.98 6.66 7.77
90 45.0 47.6 42.9 29.5 17.2 22.5 41.3 34.4 28.7 52.1 54.1 43.0 39.3
85 54.4 59.3 60.6 39.9 33.3 49.2 60.0 56.4 54.8 62.3 63.5 57.3 57.3
80 66.9 66.7 70.6 54.4 52.5 70.7 76.7 76.8 68.0 85.4 80.4 69.8 70.5
75 115 127 102 65.3 63.7 85.6 120 101 90.1 122 136 128 98.6
70 163 168 135 75.4 73.2 132 168 136 136 153 163 168 142
65 211 218 180 104 111 220 216 194 176 186 201 225 193
60 298 296 244 123 197 298 271 247 235 220 251 284 244
55 390 374 327 163 294 372 342 319 274 260 325 347 308
50 491 451 380 211 382 476 444 402 348 306 390 462 389
45 541 523 430 263 473 604 567 468 412 360 468 502 482
40 590 575 487 317 537 744 665 542 474 455 523 542 547
35 640 628 545 406 598 833 742 622 564 553 566 601 611
30 688 680 616 512 676 894 809 699 681 647 608 687 679
25 738 732 686 569 859 956 875 772 796 783 694 753 756
20 786 785 749 622 959 1,020 950 845 881 878 795 801 834
15 836 843 812 704 1,050 1,130 1,050 938 966 964 896 849 927
10 941 940 875 842 1,130 1,250 1,150 1,060 1,100 1,090 1,020 898 1,060
5 1,050 1,040 1,050 1,020 1,310 1,460 1,360 1,180 1,250 1,340 1,190 1,010 1,190
______________________________________________________________________________________________________________________
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Probability of occurrence of annual high discharges
[ng, statistic not given]
__________________________________________________________________________________________________
Maximum mean discharge
(ft3/s)
___________________________________________________________
Recurrence Maximum
Exceedance interval instantaneous 3-day period 7-day period 15-day period 30-day period
probability (years) (ft3/s)
__________________________________________________________________________________________________
0.99 1.01 24.3 16.7 15.0 13.3 10.5
0.95 1.05 76.7 65.1 60.0 55.5 47.6
0.90 1.11 133 122 114 107 95.4
0.80 1.25 247 240 228 217 200
0.50 2 685 683 662 646 620
0.20 5 1,560 1,440 1,420 1,400 1,360
0.10 10 2,240 1,920 1,910 1,880 1,830
0.04 25 3,120 2,430 2,440 2,400 2,320
0.02 50 3,770 2,740 2,770 2,710 2,600
0.01 100 4,400 3,000 3,030 2,970 2,830
0.005 200 5,000 3,210 3,250 3,180 3,010
0.002 500 5,740 ng ng ng ng
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Probability of occurrence of annual low discharges
____________________________________________________________________________________
Minimum mean discharge (ft3/s)
________________________________________________________________
Number of consecutive days
________________________________________________________________
Non- Recur-
exceed- rence
ance inter- 1 3 7 14 30 60 90 120 183
prob- val
ability (years)
____________________________________________________________________________________
0.05 20 0.700 0.773 11.35 1.95 3.66 4.97 8.27 10.3 14.2
0.10 10 3.46 3.96 14.90 5.93 9.89 12.9 20.1 24.5 31.2
0.20 5 11.5 13.3 14.9 18.8 28.0 35.8 51.4 61.4 72.3
0.50 2 59.6 67.9 91.8 98.0 129 165 210 241 265
____________________________________________________________________________________
1Graphical interpretation.
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Probability of occurrence of seasonal low discharges
_____________________________________________________________________________________
Minimum mean discharge (ft3/s)
_________________________________________________________
Number of consecutive days
_________________________________________________________
Non- Recurrence
exceedance interval 1 7 14 30 1 7 14 30
probability (years)
_____________________________________________________________________________________
December-January-February March-April-May
_________________________ ___________________________
0.05 20 5.64 6.15 6.42 6.75 1.83 11.90 2.77 4.17
0.10 10 20.0 21.2 21.8 22.7 5.87 5.91 8.48 12.0
0.20 5 69.6 72.2 73.7 76.2 18.3 22.0 27.2 36.2
0.50 2 342 354 361 374 94.9 134 147 182
June-July-August September-October-November
_________________________ ___________________________
0.05 20 1.81 2.62 4.18 9.11 1.12 3.86 5.96 10.1
0.10 10 5.92 8.70 12.8 23.4 7.01 12.7 16.1 23.5
0.20 5 20.7 30.3 41.2 63.0 27.0 39.9 45.9 58.2
0.50 2 137 185 222 274 153 194 217 238
_____________________________________________________________________________________
1Graphical interpretation.
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Annual peak discharge and corresponding gage height
[--, no data]
_____________________________________________________________________________________
Gage Peak Gage Peak
Water Date height discharge Water Date height discharge
year (feet) (ft3/s) year (feet) (ft3/s)
_____________________________________________________________________________________
Annual peak discharge, by year, and corresponding gage height
1933 July 4 72.02 46.0 1964 October 23 -- 1,030
1934 May 1 71.52 57.0 1965 July 22 -- 848
1935 June 13 72.02 140 1966 May 19 -- 1,480
1936 September 14 -- 52.0 1967 July 2 -- 1,240
1937 September 30 72.14 61.0 1968 July 16 -- 705
1938 July 5 74.80 317 1969 June 5 -- 1,200
1939 June 16 74.76 432 1970 October 20 -- 1,190
1940 June 2 75.18 534 1971 June 19 -- 889
1941 June 7 -- 449 1972 May 17 -- 1,220
1942 May 13 75.58 926 1973 October 21 -- 808
1943 June 3 -- 1,510 1974 July 10 -- 1,440
1944 June 17 -- 1,420 1975 July 31 75.02 1,680
1945 June 1 76.27 1,650 1976 October 14 73.06 1,560
1946 May 31 75.81 1,400 1977 October 1 70.30 252
1947 June 10 76.41 1,960 1978 July 5 72.88 996
1948 May 23 -- 1,210 1979 July 3 72.21 1,260
1949 April 24 -- 561 1980 November 29 71.97 742
1950 June 25 78.19 3,600 1981 August 31 71.46 461
1951 October 6 75.57 2,320 1982 July 4 72.94 1,170
1952 May 18 72.97 1,610 1983 October 14 72.23 961
1953 June 15 70.97 492 1984 July 13 73.28 1,100
1954 June 29 -- 725 1985 May 31 72.41 1,200
1955 April 5 -- 384 1986 May 28 72.59 1,470
1956 October 12 69.53 252 1987 October 3 72.45 940
1957 July 20 -- 1,870 1988 August 23 69.54 108
1958 October 1 73.10 1,360 1989 July 20 70.44 72.0
1959 November 18 -- 68.0 1990 July 3 -- 72.0
1960 November 19 -- 162 1991 June 26 70.19 76.0
1961 June 24 -- 240 1992 September 19 -- 225
1962 August 23 -- 1,260 1993 August 30 73.81 955
1963 October 5 -- 1,250 1994 June 28 -- 1,040
Annual peak discharge, from highest to lowest, and corresponding gage height
1950 June 25 78.19 3,600 1944 June 17 -- 1,420
1951 October 6 75.57 2,320 1946 May 31 75.81 1,400
1947 June 10 76.41 1,960 1958 October 1 73.10 1,360
1957 July 20 -- 1,870 1962 August 23 -- 1,260
1975 July 31 75.02 1,680 1979 July 3 72.21 1,260
1945 June 1 76.27 1,650 1963 October 5 -- 1,250
1952 May 18 72.97 1,610 1967 July 2 -- 1,240
1976 October 14 73.06 1,560 1972 May 17 -- 1,220
1943 June 3 -- 1,510 1948 May 23 -- 1,210
1966 May 19 -- 1,480 1969 June 5 -- 1,200
1986 May 28 72.59 1,470 1985 May 31 72.41 1,200
1974 July 10 -- 1,440 1970 October 20 -- 1,190
1982 July 4 72.94 1,170 1941 June 7 -- 449
1984 July 13 73.28 1,100 1939 June 16 74.76 432
1994 June 28 -- 1,040 1955 April 5 -- 384
1964 October 23 -- 1,030 1938 July 5 74.80 317
1978 July 5 72.88 996 1956 October 12 69.53 252
1983 October 14 72.23 961 1977 October 1 70.30 252
1993 August 30 73.81 955 1961 June 24 -- 240
1987 October 3 72.45 940 1992 September 19 -- 225
1942 May 13 75.58 926 1960 November 19 -- 162
1971 June 19 -- 889 1935 June 13 72.02 140
1965 July 22 -- 848 1988 August 23 69.54 108
1973 October 21 -- 808 1991 June 26 70.19 76.0
1980 November 29 71.97 742 1989 July 20 70.44 72.0
1954 June 29 -- 725 1990 July 3 -- 72.0
1968 July 16 -- 705 1959 November 18 -- 68.0
1949 April 24 -- 561 1937 September 30 72.14 61.0
1940 June 2 75.18 534 1934 May 1 71.52 57.0
1953 June 15 70.97 492 1936 September 14 -- 52.0
1981 August 31 71.46 461 1933 July 4 72.02 46.0
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Monthly and annual mean discharges, in cubic feet per second
[Data were not rounded in accordance with U.S. Geological Survey publication standards; --, no data]
__________________________________________________________________________________________________________________________________
Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
__________________________________________________________________________________________________________________________________
1933 -- -- -- -- -- -- -- 0.603 2.15 20.5 8.83 5.63 --
1934 5.10 3.57 0.952 0.355 0.400 1.19 25.0 26.7 6.00 4.63 3.57 1.61 6.61
1935 6.56 11.1 7.98 3.19 3.83 4.89 25.9 41.5 29.1 11.7 6.26 8.99 13.4
1936 8.47 7.87 5.48 2.46 1.08 0.597 4.00 0.842 11.2 13.2 2.73 8.70 5.55
1937 8.23 7.42 4.55 2.78 0.979 0.626 14.1 2.92 3.47 10.1 5.88 7.14 5.69
1938 28.7 45.8 41.7 41.0 43.9 33.3 9.89 13.3 124.4 186.5 124.1 124.9 68.2
1939 139.1 148.2 148.7 128.7 134.3 168.5 220.5 273.9 260.5 202.3 124.3 165.0 176.3
1940 206.1 218.3 210.8 190.0 202.8 222.6 285.0 403.9 388.0 262.4 118.9 134.8 236.9
1941 176.7 191.9 199.0 218.7 207.9 213.5 47.1 92.6 140.3 214.4 231.9 162.0 174.8
1942 358.9 496.8 479.4 469.7 484.3 498.1 538.8 620.3 523.0 150.9 128.6 165.5 408.7
1943 261.0 314.7 328.4 352.3 365.7 401.9 465.3 656.6 920.4 784.3 673.5 591.5 510.1
1944 636.4 599.0 545.2 551.0 544.1 526.1 512.3 578.9 792.2 624.8 553.9 738.2 599.8
1945 737.0 822.4 823.5 776.8 751.8 755.8 1,064 1,142 1,009 760.8 573.1 542.1 813.2
1946 578.5 574.5 601.3 583.1 536.3 553.3 826.1 912.5 786.2 636.0 376.8 264.6 602.9
1947 398.0 452.6 474.8 451.6 405.7 407.1 622.9 1,030 1,373 1,103 791.2 785.8 692.3
1948 840.9 738.0 783.2 723.1 643.9 662.3 807.9 1,029 875.6 647.3 454.0 384.0 716.3
1949 344.3 308.2 273.5 265.8 262.9 405.4 513.5 494.5 436.9 357.1 405.0 435.5 375.6
1950 554.2 531.3 546.8 521.0 532.1 564.5 741.5 1,624 2,025 1,840 1,358 1,712 1,048
1951 2,071 1,649 1,498 1,418 1,342 1,396 1,199 1,569 1,484 1,014 409.8 440.5 1,292
1952 448.6 578.9 803.4 1,037 1,026 969.3 693.2 1,261 1,410 1,081 546.6 489.8 862.0
1953 349.6 267.3 308.2 312.8 327.5 264.8 81.5 162.0 288.1 287.5 300.3 272.7 268.5
1954 232.3 189.6 205.6 202.2 208.4 196.1 209.7 318.0 512.0 556.6 337.5 267.3 286.8
1955 250.0 328.5 328.4 312.5 305.4 341.9 250.8 243.7 233.7 243.0 236.7 219.5 274.4
1956 180.2 145.3 145.3 143.0 146.4 145.5 151.6 135.7 164.5 186.1 170.5 153.9 155.7
1957 221.6 229.4 209.2 170.0 158.7 262.5 24.9 9.90 314.9 1,464 1,178 1,094 447.4
1958 1,265 1,083 547.5 739.2 662.1 844.9 629.9 277.2 308.2 340.9 171.9 46.8 576.3
1959 46.0 44.3 44.1 49.1 46.4 50.3 42.7 38.0 37.7 45.8 50.4 37.3 44.4
1960 153.4 160.4 147.6 118.3 116.2 112.5 104.2 32.4 18.2 24.1 31.3 14.9 86.1
1961 101.9 111.0 35.0 35.0 35.0 35.0 34.4 22.1 46.3 47.7 38.0 84.8 52.1
1962 114.5 86.2 56.0 56.0 56.0 55.9 49.1 48.9 658.2 1,070 1,154 1,202 385.2
1963 1,237 1,102 860.3 906.1 876.2 772.7 917.3 1,012 1,022 671.3 633.4 823.3 902.4
1964 940.3 525.9 538.8 517.8 460.2 252.6 82.4 30.7 37.5 91.7 90.6 55.7 302.5
1965 234.2 526.9 545.3 582.4 622.5 635.2 292.8 365.7 471.8 783.1 769.8 819.3 553.8
1966 867.3 957.8 993.9 987.1 937.5 540.4 283.2 1,284 1,157 1,007 930.1 1,061 917.5
1967 1,035 940.3 933.2 904.5 988.6 925.6 515.4 707.5 961.3 963.6 695.0 735.9 858.6
1968 360.7 324.1 227.1 212.3 201.4 117.3 32.6 13.0 212.8 556.1 534.9 503.6 275.1
1969 431.7 566.2 926.7 1,069 1,157 1,115 387.2 1,001 1,142 955.8 811.4 1,008 879.9
1970 1,136 1,114 908.0 902.9 860.5 821.5 300.8 903.1 1,024 872.5 778.4 826.6 871.4
1971 665.3 608.3 656.9 627.7 736.4 797.7 467.5 760.3 864.1 662.2 528.9 280.7 638.1
1972 176.7 369.2 713.5 811.2 828.0 696.9 445.5 866.5 951.9 707.9 951.9 940.1 704.6
1973 795.0 563.6 488.5 518.7 523.4 325.8 140.2 315.9 267.0 176.8 200.0 431.5 395.0
1974 776.5 1,026 807.1 809.7 846.4 766.2 379.2 849.2 957.1 1,282 1,061 1,255 901.7
1975 1,327 1,053 855.4 767.7 713.0 639.4 391.6 763.7 1,354 803.0 1,464 1,475 968.2
1976 1,463 1,100 683.4 1,033 1,012 803.8 821.4 1,030 939.8 854.5 856.9 552.4 929.4
1977 178.5 162.9 126.1 121.5 122.1 123.7 104.7 75.4 81.8 108.5 82.7 78.6 113.9
1978 219.6 283.8 449.9 490.5 498.3 501.8 256.3 520.0 821.4 859.0 506.2 322.5 477.9
1979 354.2 393.1 400.0 397.3 391.8 391.5 293.3 922.3 1,126 1,033 1,051 1,039 650.8
1980 887.1 663.3 846.7 833.3 828.4 809.5 566.8 529.0 574.4 218.4 111.0 94.6 580.0
1981 71.3 67.8 57.5 54.0 57.3 70.6 55.4 62.9 100.1 376.4 428.3 405.0 151.2
1982 646.6 644.6 632.8 651.3 668.6 645.9 106.9 714.0 956.3 987.2 977.6 878.6 710.2
1983 902.7 747.3 750.0 884.1 746.9 297.2 541.4 611.0 638.3 622.1 523.9 428.3 640.8
1984 233.1 764.3 802.2 786.1 786.9 660.5 521.3 449.7 428.6 1,014 790.9 535.1 647.9
1985 187.4 439.7 757.4 804.8 800.0 615.7 323.6 701.1 940.9 835.5 751.4 752.9 658.5
1986 905.5 827.5 766.8 786.8 776.1 738.5 888.9 1,077 1,225 996.8 945.3 924.5 905.3
1987 603.6 600.4 663.2 663.2 669.6 460.5 194.7 170.3 285.0 186.5 239.9 247.7 414.2
1988 94.5 81.2 65.0 65.0 65.0 65.0 65.9 63.4 86.5 90.3 91.7 71.6 75.5
1989 55.7 54.2 55.2 56.0 56.0 56.1 58.2 61.0 67.5 70.1 68.5 63.7 60.2
1990 62.9 62.0 62.0 62.0 62.5 63.5 65.1 65.4 66.8 68.9 63.5 60.5 63.8
1991 63.0 61.0 61.5 62.1 62.9 63.7 64.7 68.0 67.4 69.6 68.1 66.2 64.9
1992 75.5 72.6 69.5 69.0 66.7 72.1 74.0 74.3 65.2 55.6 60.9 130.4 73.7
1993 187.8 203.6 526.1 501.8 497.0 488.9 290.1 548.5 783.8 625.2 762.1 597.1 501.4
1994 815.0 535.7 587.5 619.8 643.1 390.9 154.2 254.4 521.9 340.3 673.4 739.9 522.4
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