05077700 RUFFY BROOK NEAR GONVICK, MN

List Of Figures:

Annual mean discharge
Annual flow duration

LOCATION.--Lat 47°44'50'', long 95°24'45", in SE1/4SE1/4 sec.5, T.149 N., R.37 W., Clearwater County, Hydrologic Unit 09020305, at culvert on County Highway 67, 4.0 mi upstream from mouth, and 4.8 mi east of Gonvick.
DRAINAGE AREA.--45.2 mi2.
PERIOD OF RECORD.--April 1960 to current. April 1960 to September 1978, operated as a continuous-record station. October 1978 to January 1986, operated as a high-flow partial-record station. February 1986 to October 1986, operated as a continuous-record station. November 1986 to current, operated as a high-flow partial record station. Monthly and daily figures for Apr. 1, 1960, to June 30, 1960, published in WSP 1913.
GAGE.--Nonrecording gage and crest-stage gage. Datum of gage is 1,227.93 ft, adjustment of 1912 (levels by U.S. Army Corps of Engineers). Prior to Sept. 9, 1960, reference point at same site and datum.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 453 ft3/s, Mar. 30, 1967, gage height, 6.35 ft; maximum gage height, 6.62 ft, Apr. 9, 1969, backwater from ice; no flow Feb. 20 to Mar. 6, 1968.

Annual mean discharge

Annual mean discharge for 05077700 Ruffy Brook near Gonvick, Minnesota

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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      34.7      1972           1.15      1968           7.93       9.12       1.15       4.87
November     31.4      1972           1.45      1977           6.87       6.88       1.00       4.22
December     13.6      1978           0.314     1977           4.53       3.44       0.76       2.78
January      8.99      1974           0.396     1977           3.17       2.20       0.69       1.95
February     7.38      1974           0.393     1968           2.77       1.84       0.66       1.70
March        37.5      1966           2.07      1971           12.4       11.9       0.97       7.60
April        118       1966           6.91      1977           58.2       30.9       0.53       35.7
May          105       1962           4.61      1977           29.1       22.4       0.77       17.9
June         54.4      1962           2.29      1961           18.2       16.8       0.92       11.2
July         57.3      1962           2.10      1961           9.31       13.7       1.47       5.72
August       18.7      1966           1.09      1976           3.79       3.97       1.05       2.33
September    59.3      1973           0.623     1967           6.57       12.8       1.94       4.04
Annual       25.3      1962           3.56      1977           13.8       5.79       0.42       100
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Annual flow duration

Annual flow duration for 05077700 Ruffy Brook near Gonvick, Minnesota

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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           0.59    0.66    0.93    4.60    3.30    1.50    1.00    0.79    0.54    0.89    1.60    0.43    0.74
  90           1.10    0.76    1.20    6.81    5.30    2.20    1.50    0.93    0.81    1.30    1.90    1.30    1.20
  85           1.20    0.99    1.50    8.55    6.64    2.50    1.80    1.10    1.20    1.80    2.20    1.50    1.60
  80           1.20    1.10    1.90    13.4    7.65    3.00    1.80    1.10    1.20    1.80    2.20    1.90    1.60
  75           1.40    1.30    1.90    17.9    8.83    3.50    2.20    1.30    1.50    2.20    2.50    2.20    2.00
  70           1.70    1.30    2.50    21.1    10.5    4.20    2.20    1.50    1.80    2.70    2.90    2.50    2.00
  65           1.90    1.50    2.50    24.2    12.6    4.90    2.60    1.50    1.80    3.20    3.80    2.80    2.60
  60           2.10    1.70    2.50    27.9    14.7    6.34    2.60    1.70    1.80    3.20    3.80    2.80    2.60
  55           2.30    2.20    3.20    31.4    16.7    7.17    3.20    2.00    2.20    3.20    4.40    3.20    3.65
  50           2.60    2.20    3.20    36.9    18.6    7.90    3.20    2.00    2.20    3.80    4.40    3.60    4.11
  45           3.20    2.50    3.20    42.5    20.4    9.70    3.80    2.00    2.20    3.80    5.10    3.60    4.62
  40           3.20    2.90    4.48    51.8    23.6    11.3    3.80    2.40    2.70    4.60    5.10    4.00    5.18
  35           3.60    3.30    4.86    61.4    26.9    13.5    4.60    2.80    2.70    5.88    5.90    4.60    6.05
  30           3.60    3.30    5.44    71.3    30.6    16.3    5.91    2.80    3.30    6.71    5.90    4.60    7.70
  25           4.00    3.80    6.07    82.2    35.2    20.9    6.82    3.30    4.00    8.01    7.07    5.20    9.50
  20           4.50    3.80    9.15    98.0    40.7    27.8    7.58    3.80    5.60    9.51    8.06    5.90    14.0
  15           4.50    4.40    21.3    113     47.4    35.7    8.87    4.50    7.34    11.9    10.2    7.70    21.0
  10           6.10    5.00    34.7    138     63.0    46.9    14.0    7.13    11.2    15.5    14.7    10.5    34.6
  5            8.56    6.60    52.0    173     97.0    64.5    28.0    12.3    24.0    28.4    20.2    13.2    65.4
______________________________________________________________________________________________________________________

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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         ng          22.5          21.3          16.6           10.2
  0.95         1.05         62.6        47.2          43.2          33.0           22.1
  0.90         1.11         81.5        66.8          59.8          45.3           31.4
  0.80         1.25         110         97.5          84.7          63.4           45.1
  0.50         2            187         177           144           106            76.7
  0.20         5            296         276           210           152            108
  0.10         10           367         329           242           174            121
  0.04         25           454         383           271           193            132
  0.02         50           515         416           287           204            136
  0.01         100          574         442           299           212            140
  0.005        200          630         464           308           218            142
  0.002        500          702         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       0       0       0       0.279   0.553   0.742   0.983   1.13
0.10       10       0.310   0.348   0.389   0.394   0.447   0.773   0.987   1.26    1.46
0.20       5        0.476   0.528   0.623   0.662   0.729   1.10    1.35    1.66    1.98
0.50       2        0.830   0.900   1.09    1.24    1.46    1.92    2.24    2.66    3.48
________________________________________________________________________________________

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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           0       0       0       0.391       0       0       0.775   1.81
0.10           10           0.109   0.408   0.414   0.585       0.720   0.720   1.06    2.26
0.20           5            0.779   0.783   0.802   0.921       1.13    1.13    1.49    3.04
0.50           2            1.83    1.85    1.91    1.99        2.13    2.15    2.62    5.74

                                  June-July-August                September-October-November
                            _____________________________       _____________________________

0.05           20           0.453   0.730   0.848   1.03        0.297   0.438   0.697   0.764
0.10           10           0.540   0.823   0.967   1.19        0.430   0.600   0.907   1.03
0.20           5            0.671   0.960   1.14    1.42        0.647   0.856   1.23    1.45
0.50           2            1.03    1.32    1.59    2.06        1.26    1.56    2.07    2.72
_____________________________________________________________________________________________

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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

1960     April 17        4.45     74.0       1978    April 7         5.67     357
1961     April 20        3.74     66.0       1979    April 20        4.94     284
1962     July 7          6.70     364        1980    April 5         3.36     137
1963     May 28          5.48     225        1981    June 28       --         150
1964     April 16        4.45     134        1982    April 15        4.59     249
1965     April 13        6.38     412        1983    March 7         4.81     175
1966     April 2         5.53     265        1984    March 26        4.03     195
1967     March 30        6.35     453        1985    May 13          4.91     281
1968     June 10         2.70     76.0       1986    March 29        4.61     190
1969     April 9         6.62     232        1987    July 22         6.05     395
1970     April 29        5.28     279        1988    April 4         5.20     165
1971     April 8         5.40     176        1989    April 5         4.44     178
1972     April 17        4.87     237        1990    June 20       --         30.0
1973     September 2     3.94     156        1991    July 3          2.29     66.0
1974     April 12        5.80     268        1992    March 7         3.25     98.0
1975     April 17        5.74     364        1993    March 29        3.74     169
1976     March 29        5.25     147        1994    July 19         2.85     112
1977     September 24    2.05     47.0       1995    March 13        6.10     200

Annual peak discharge, from highest to lowest, and corresponding gage height

1967     March 30        6.35     453        1989    April 5         4.44     178
1965     April 13        6.38     412        1971    April 8         5.40     176
1987     July 22         6.05     395        1983    March 7         4.81     175
1962     July 7          6.70     364        1993    March 29        3.74     169
1975     April 17        5.74     364        1988    April 4         5.20     165
1978     April 7         5.67     357        1973    September 2     3.94     156
1979     April 20        4.94     284        1981    June 28       --         150
1985     May 13          4.91     281        1976    March 29        5.25     147
1970     April 29        5.28     279        1980    April 5         3.36     137
1974     April 12        5.80     268        1964    April 16        4.45     134
1966     April 2         5.53     265        1994    July 19         2.85     112
1982     April 15        4.59     249        1992    March 7         3.25     98.0
1972     April 17        4.87     237        1968    June 10         2.70     76.0
1969     April 9         6.62     232        1960    April 17        4.45     74.0
1963     May 28          5.48     225        1961    April 20        3.74     66.0
1995     March 13        6.10     200        1991    July 3          2.29     66.0
1984     March 26        4.03     195        1977    September 24    2.05     47.0
1986     March 29        4.61     190        1990    June 20       --         30.0
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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
______________________________________________________________________________________________________________________

1960    --      --      --       --       --       --      31.5     10.3     25.2    4.73    3.28    2.25     --
1961    1.60    2.47    1.75     0.932    0.889    6.44    26.3     26.8     2.29    2.10    1.17    4.10     6.43
1962    3.22    3.53    1.76     1.21     1.69     2.68    60.9     104.8    54.4    57.3    3.38    7.28     25.3
1963    4.26    5.53    3.89     1.87     1.02     10.9    31.9     38.2     53.2    7.98    6.89    2.17     14.0
1964    1.97    2.12    1.35     1.22     1.37     2.32    50.1     22.4     12.7    4.45    1.58    5.67     8.89

1965    5.92    3.61    2.91     2.50     1.72     2.56    92.9     51.6     49.2    5.26    2.45    4.75     18.7
1966    10.2    5.15    4.84     4.18     2.76     37.5    118.2    33.6     6.83    4.33    18.7    2.94     20.8
1967    5.08    5.11    2.49     2.09     2.33     30.3    71.3     28.7     29.4    6.19    1.94    0.623    15.4
1968    1.15    1.71    4.58     2.76     0.393    14.2    22.4     10.6     23.9    7.62    1.82    2.62     7.80
1969    5.09    3.41    3.00     2.06     3.64     3.10    74.1     34.1     16.1    3.55    5.04    2.53     12.9

1970    12.4    10.0    5.79     4.59     4.33     4.66    85.8     38.5     25.7    3.96    1.41    1.56     16.5
1971    4.48    6.38    4.06     1.44     1.22     2.07    54.2     16.8     7.71    4.85    2.14    3.18     9.01
1972    34.7    31.4    8.23     6.61     4.79     17.8    74.1     29.9     9.50    11.8    8.38    2.54     19.9
1973    5.54    8.31    3.71     4.09     4.83     33.9    12.8     8.74     2.52    3.22    3.12    59.3     12.5
1974    28.9    8.30    11.5     8.99     7.38     5.81    85.2     43.9     12.3    2.87    3.20    2.15     18.4

1975    3.19    5.01    3.66     3.32     4.08     5.73    89.6     27.2     13.8    38.2    2.93    6.44     16.9
1976    5.13    6.51    4.11     3.55     3.58     18.5    35.2     5.42     2.60    2.14    1.09    0.694    7.35
1977    1.21    1.45    0.314    0.396    0.998    3.79    6.91     4.61     3.39    3.88    1.89    13.9     3.56
1978    13.1    13.7    13.6     5.25     2.80     3.99    91.7     10.9     5.61    5.23    2.70    3.78     14.3
1986    --      --      --       --       --       28.8    48.8     35.0     7.89    6.62    2.73    2.99     --
1987    3.52    --      --       --       --       --      --       --       --      --      --      --       --
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