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Statistics of monthly and annual mean discharges
[m, more than 1 year of occurrence]
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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
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October 740 1994 48.3 1911 386 207 0.54 8.63
November 688 1907 79.3 1911 360 178 0.49 8.04
December 489 1994 79.9 1911 303 132 0.44 6.77
January 400 1994 80.0 m 247 105 0.43 5.52
February 439 1994 70.0 1912 221 98.6 0.45 4.94
March 650 1907 70.0 1912 280 142 0.51 6.25
April 652 1907 180 1913 363 137 0.38 8.11
May 772 1906 221 1911 482 175 0.36 10.8
June 965 1906 169 1911 545 225 0.41 12.2
July 932 1906 108 1911 506 244 0.48 11.3
August 780 1905 64.8 1910 400 228 0.57 8.93
September 817 1993 32.6 1910 383 236 0.62 8.57
Annual 609 1906 123 1911 375 135 0.36 100
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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
______________________________________________________________________________________________________________________
95 81.5 72.2 73.0 168 228 204 110 86.0 45.1 82.4 88.7 80.6 81.0
90 83.0 80.1 109 201 258 245 170 116 92.6 136 122 109 124
85 94.8 85.2 127 225 294 281 227 146 139 159 144 136 158
80 117 88.9 177 242 307 322 252 188 191 182 164 154 199
75 188 158 185 254 317 340 282 212 207 213 213 172 223
70 193 185 202 274 358 375 316 243 218 292 270 218 253
65 198 196 207 284 394 422 389 294 262 316 314 276 273
60 240 223 248 304 425 481 437 314 300 325 326 290 293
55 248 232 254 315 442 514 474 346 326 335 336 306 315
50 257 237 259 339 454 572 513 369 342 344 353 330 339
45 277 242 267 358 487 596 547 394 359 389 374 340 363
40 284 249 277 383 526 622 608 428 393 436 391 351 390
35 292 258 309 407 538 652 657 463 444 460 411 367 419
30 301 262 339 436 572 689 701 514 500 507 433 377 458
25 321 267 364 460 605 713 720 564 553 558 462 387 505
20 331 272 379 496 682 735 738 643 618 587 550 416 562
15 378 288 397 526 729 766 767 714 692 618 572 465 622
10 0.49 338 445 562 748 851 802 760 753 651 605 485 705
5 0.49 423 0.49 637 778 957 848 799 796 712 660 505 769
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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 ng 198 187 181 172
0.95 1.05 ng 324 307 291 277
0.90 1.11 462 405 385 364 346
0.80 1.25 549 512 489 462 440
0.50 2 738 726 701 667 640
0.20 5 947 913 895 868 843
0.10 10 1,060 989 978 961 939
0.04 25 1,180 1,050 1,050 1,050 1,030
0.02 50 1,260 1,080 1,080 1,090 1,080
0.01 100 1,330 1,100 1,110 1,130 1,120
0.005 200 1,390 1,120 1,130 1,150 1,150
0.002 500 1,460 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)
__________________________________________________________________________________________
0.05 20 29.2 33.1 35.7 37.8 41.7 45.9 58.1 66.2 79.4
0.10 10 50.8 54.6 57.2 59.6 64.4 70.8 84.6 95.3 113
0.20 5 88.7 91.1 93.0 95.4 101 111 126 141 166
0.50 2 186 1186 1187 187 194 216 232 254 298
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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
_________________________ _________________________
0.05 20 64.3 66.5 68.7 70.3 86.9 86.9 87.0 90.3
0.10 10 85.4 87.1 89.5 91.7 109 109 111 117
0.20 5 116 118 120 123 141 143 147 157
0.50 2 190 192 193 198 224 229 238 257
June-July-August September-October-November
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0.05 20 54.5 56.6 66.7 83.9 38.6 48.7 51.8 57.5
0.10 10 84.6 88.7 100 122 72.5 85.3 89.7 97.1
0.20 5 136 144 156 183 136 150 156 166
0.50 2 287 304 316 351 307 320 333 347
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Annual peak discharge and corresponding gage height
[--, no data]
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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
1904 June 23 -- 1,075 1913 July 5 3.85 758
1905 August 7 4.00 855 1914 June 27 2.40 584
1906 -- 4.25 1,020 1915 July 19 2.80 837
1908 June 13 4.10 921 1916 June 29 3.00 982
1909 September 15 3.55 580 1917 October 1 2.45 613
1910 -- 3.30 449 1993 September 20 8.10 842
1911 April 19 2.90 274 1994 October 3 8.09 840
1912 July 8 3.20 402
Annual peak discharge, from highest to lowest, and corresponding gage height
1904 June 23 -- 1,075 1913 July 5 3.85 758
1906 -- 4.25 1,020 1917 October 1 2.45 613
1916 June 29 3.00 982 1914 June 27 2.40 584
1908 June 13 4.10 921 1909 September 15 3.55 580
1905 August 7 4.00 855 1910 -- 3.30 449
1993 September 20 8.10 842 1912 July 8 3.20 402
1994 October 3 8.09 840 1911 April 19 2.90 274
1915 July 19 2.80 837
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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]
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Year Oct. Nov. Dec. Jan. Feb. March April May June July Aug. Sept. Annual
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1904 -- -- -- -- -- -- -- 574.1 695.7 512.6 365.4 329.0 --
1905 325.8 328.0 347.0 300.0 250.0 320.5 292.2 515.9 612.9 718.5 779.6 749.7 463.0
1906 613.5 557.5 450.0 382.0 260.0 382.0 498.9 772.2 965.0 931.6 742.1 726.6 608.8
1907 673.9 688.5 480.0 369.0 261.0 650.0 651.8 709.5 692.0 564.5 359.0 302.7 535.2
1908 337.4 336.0 301.1 260.0 230.0 200.0 312.3 420.6 813.2 685.6 453.5 361.6 392.8
1909 301.0 261.3 220.0 190.0 152.0 261.0 398.6 460.0 491.6 342.6 375.5 549.0 334.0
1910 510.7 425.8 389.6 325.0 240.0 284.8 434.3 416.8 293.9 162.6 64.8 32.6 298.9
1911 48.3 79.3 79.9 80.0 85.0 125.3 228.9 221.0 168.6 108.1 125.8 127.7 123.2
1912 163.8 128.2 110.0 80.0 70.0 70.0 181.4 284.3 324.8 278.2 216.2 203.5 176.1
1913 193.4 201.1 164.0 103.0 76.8 130.0 179.9 266.3 242.6 322.2 261.0 359.2 209.0
1914 320.4 362.8 348.7 280.0 190.0 185.0 248.6 306.3 409.3 522.4 443.3 379.7 334.0
1915 407.5 418.6 327.5 243.0 335.0 264.4 282.8 369.8 555.9 764.1 635.8 474.1 423.8
1916 432.4 369.1 321.5 211.2 256.4 293.8 392.1 671.2 774.3 729.4 549.0 584.6 465.9
1917 589.1 526.0 379.0 300.3 264.6 274.7 440.6 532.2 402.2 254.1 123.8 86.9 348.3
1992 -- -- -- -- -- -- -- -- -- -- 232.7 207.8 --
1993 138.5 142.6 140.6 180.8 209.3 313.6 357.2 453.1 702.0 745.2 759.3 816.6 413.9
1994 740.1 571.4 489.2 400.0 439.3 443.1 549.1 740.8 568.5 452.0 308.8 226.7 494.7
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