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Statistics of monthly and annual mean discharges
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Maximum Minimum Mean
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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
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October 1,560 1994 2.02 1977 388 418 1.08 4.99
November 900 1987 0 1977 310 265 0.86 3.98
December 817 1986 0 1977 270 226 0.84 3.47
January 747 1986 4.95 1977 261 198 0.76 3.35
February 745 1987 14.0 1977 305 202 0.66 3.92
March 2,080 1994 75.9 1977 783 503 0.64 10.1
April 4,160 1978 165 1977 1,710 1,430 0.84 21.9
May 3,390 1986 22.0 1977 1,010 837 0.83 13.0
June 2,480 1986 86.4 1977 951 707 0.74 12.2
July 2,670 1993 73.4 1977 834 735 0.88 10.7
August 2,670 1993 35.6 1977 515 600 1.16 6.63
September 2,140 1993 12.6 1976 445 558 1.25 5.71
Annual 1,600 1986 53.1 1977 649 418 0.64 100
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Monthly and annual flow duration, in cubic feet per second
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Percentage
of days
discharge Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. Annual
equaled or
exceeded
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95 7.43 26.7 126 202 47.0 156 73.5 36.0 23.7 2.30 23.7 34.2 49.5
90 63.0 95.0 185 287 246 196 92.3 73.2 43.4 63.5 64.9 57.5 77.6
85 82.6 104 223 401 337 223 123 82.5 56.2 74.3 79.2 70.7 104
80 94.6 118 267 447 381 269 172 95.2 73.3 98.6 100 88.2 133
75 102 142 331 498 425 323 202 136 92.3 119 117 108 167
70 118 184 377 563 470 425 263 175 121 132 128 120 205
65 139 215 404 663 528 491 327 217 150 145 137 130 241
60 169 242 432 750 612 562 373 264 174 175 154 153 279
55 200 262 460 807 716 638 455 309 202 201 183 195 317
50 228 279 488 890 782 730 543 348 232 226 205 222 360
45 247 296 523 1,030 863 824 645 385 263 275 238 251 405
40 267 312 584 1,270 972 925 766 422 295 307 293 268 462
35 287 329 653 1,550 1,060 1,100 963 460 331 337 341 283 543
30 314 349 725 1,740 1,140 1,250 1,120 533 379 373 374 323 658
25 355 373 793 2,110 1,310 1,420 1,240 689 466 416 408 360 790
20 400 417 901 2,550 1,590 1,610 1,460 795 633 522 472 397 923
15 454 576 1,210 3,240 1,880 1,820 1,780 898 901 851 675 456 1,140
10 569 672 1,750 4,320 2,220 2,080 2,020 1,070 1,080 1,050 819 641 1,600
5 708 738 2,540 6,090 2,680 2,640 2,360 1,940 2,050 1,420 917 813 2,280
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Probability of annual high discharges
[ng, statistic not given]
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Maximum average discharge
(ft3/s)
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Recurrence Maximum
Exceedance interval instantaneous 3-day period 7-day period 15-day period 30-day period
probability (years) (ft3/s)
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0.99 1.01 187 166 150 114 99.4
0.95 1.05 460 423 380 297 258
0.90 1.11 722 673 602 477 408
0.80 1.25 1,210 1,140 1,020 813 683
0.50 2 3,010 2,870 2,550 2,030 1,610
0.20 5 6,750 6,390 5,680 4,400 3,270
0.10 10 9,900 9,260 8,270 6,260 4,460
0.04 25 14,500 13,300 11,900 8,800 5,980
0.02 50 18,200 16,600 14,900 10,700 7,060
0.01 100 22,200 19,900 18,000 12,700 8,100
0.005 200 26,400 23,400 21,200 14,700 9,090
0.002 500 32,200 ng ng ng ng
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Probability of annual low discharges
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Minimum average discharge (ft3/s)
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Number of consecutive days
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Non- Recur-
exceed- rence
ance inter- 1 3 7 14 30 60 90 120 183
prob- val
ability (years)
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0.05 20 0 0 0 0 0 0 4.42 8.41 18.9
0.10 10 9.94 11.7 13.2 18.0 20.8 36.8 137.2 137.5 37.9
0.20 5 20.3 23.5 28.6 35.3 41.7 61.2 167.0 173.0 79.3
0.50 2 62.6 69.7 89.9 99.9 118 141 236 1238 240
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1Graphical interpretation.
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Probability of seasonal low discharges
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Minimum average discharge (ft3/s)
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Number of consecutive days
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Non- Recurrence
exceedance interval 1 7 14 30 1 7 14 30
probability (years)
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December-January-February March-April-May
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0.05 20 0 0 0 0 39.7 48.9 52.7 71.1
0.10 10 42.0 48.3 51.7 55.8 74.8 90.6 100 133
0.20 5 65.2 76.6 82.4 89.9 140 165 186 252
0.50 2 134 160 171 188 312 349 392 600
June-July-August September-October-November
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0.05 20 12.5 16.7 25.4 47.9 0 0 0 0
0.10 10 23.1 30.7 44.0 73.1 21.7 28.0 31.7 38.1
0.20 5 46.6 61.3 82.1 120 34.3 45.5 51.7 63.2
0.50 2 159 199 237 293 79.1 107 123 150
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Annual peak discharge and corresponding gage height, period of record
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Gage Peak Gage Peak
Water Date height discharge Water Date height discharge
year (feet) (ft3/s) year (feet) (ft3/s)
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Annual peak discharge, by year, and corresponding gage height
1976 March 31 16.94 2,500 1986 April 1 27.27 6,720
1977 June 27 10.30 408 1987 March 26 15.34 2,460
1978 April 2 33.54 9,200 1988 March 30 10.97 826
1979 April 18 33.03 9,600 1989 April 7 35.81 12,900
1980 April 4 19.13 3,250 1990 April 2 11.26 857
1981 August 4 10.41 544 1991 July 5 16.15 2,820
1982 April 4 23.07 4,200 1992 March 10 13.62 1,750
1983 March 19 11.08 824 1993 April 3 28.30 6,400
1984 March 31 25.58 5,100 1994 April 1 26.43 6,320
1985 June 3 18.71 3,680
Annual peak discharge, from highest to lowest, and corresponding gage height
1989 April 7 35.81 12,900 1991 July 5 16.15 2,820
1979 April 18 33.03 9,600 1976 March 31 16.94 2,500
1978 April 2 33.54 9,200 1987 March 26 15.34 2,460
1986 April 1 27.27 6,720 1992 March 10 13.62 1,750
1993 April 3 28.30 6,400 1990 April 2 11.26 857
1994 April 1 26.43 6,320 1988 March 30 10.97 826
1984 March 31 25.58 5,100 1983 March 19 11.08 824
1982 April 4 23.07 4,200 1981 August 4 10.41 544
1985 June 3 18.71 3,680 1977 June 27 10.30 408
1980 April 4 19.13 3,250
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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]
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Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
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1975 -- -- -- -- -- -- -- -- -- -- -- -- --
1976 368.5 327.7 261.6 228.9 319.3 870.3 880.3 367.8 231.2 120.1 68.4 12.6 337.9
1977 2.02 0 0 4.95 14.0 75.9 165.4 22.0 86.4 73.4 35.6 159.7 53.1
1978 255.6 304.1 378.4 403.5 333.7 1,002 4,165 1,610 1,165 1,404 320.5 120.6 955.0
1979 146.3 118.6 115.4 104.5 102.0 314.4 3,980 2,013 1,760 1,315 875.3 616.4 954.8
1980 415.6 372.1 328.7 375.9 402.6 641.2 1,301 599.8 537.1 193.8 135.6 36.0 443.9
1981 64.9 107.3 105.5 105.8 151.4 245.9 228.8 201.4 228.8 204.5 266.1 56.3 161.4
1982 148.4 195.8 200.5 233.2 251.8 679.3 1,721 933.2 822.7 608.0 339.9 221.0 529.5
1983 424.1 373.4 359.5 334.0 326.3 639.9 514.9 378.1 230.9 403.7 346.1 380.1 393.3
1984 329.9 272.5 261.5 278.2 367.5 1,113 2,132 985.2 1,918 972.1 414.0 186.4 767.5
1985 443.7 561.2 365.2 267.7 307.3 1,199 1,023 1,250 1,863 1,202 1,073 969.2 879.2
1986 851.0 790.4 816.6 746.8 681.0 1,543 3,791 3394 2,485 1,784 852.5 1,496 1,604
1987 1312 900.0 798.0 639.9 744.8 1,337 832.4 651.5 509.4 382.5 180.1 172.9 705.8
1988 147.4 151.7 142.8 148.4 237.0 519.4 470.5 385.4 244.9 85.4 87.2 72.6 224.2
1989 69.1 65.5 52.7 68.4 157.3 378.3 3,832 1,153 819.7 349.9 159.8 219.8 607.4
1990 170.7 126.6 95.1 103.7 118.5 356.5 453.5 520.7 561.6 432.4 243.4 171.7 280.3
1991 127.7 66.8 63.2 63.1 88.2 353.5 548.5 854.5 1,049 1,631 554.3 815.9 520.3
1992 321.1 139.8 147.6 180.9 237.4 734.8 555.6 459.0 537.6 395.5 495.9 309.5 376.9
1993 214 236 204 197 302 791 2,820 1,100 1,610 2,670 2,670 2,140 1,250
1994 1,560 776 432 469 655 2,080 3,010 2,340 1,410 1,610 671 294 1,280
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