05094000 SOUTH BRANCH TWO RIVERS AT LAKE BRONSON, MN


List Of Figures:

Annual mean discharge
Annual flow duration


LOCATION.--Lat 4843'50'', long 9639'50", in SW1/4SW1/4 sec.30, T.161 N., R.46 W., Kittson County, Hydrologic Unit 09020312, on left bank 70 ft upstream from culvert on U.S. Highway 59 at Lake Bronson and 3.4 mi downstream from dam at outlet of Bronson Lake.
DRAINAGE AREA.--444 mi2.
PERIOD OF RECORD.--September 1928 to November 1936, April to September 1937, April 1941 to October 1943, April to December 1944, April 1945 to September 1947, October 1953 to September 1981, April 1985 to current year. Monthly discharge only for some periods, published in Water Supply Paper 1308. October 1981 to March 1985, annual maximums only. Published as South Fork Two Rivers at Bronson prior to 1941.
GAGE.--Water-stage recorder. Datum of gage is 928.53 ft above mean sea level (Minnesota Department of Transportation benchmark). Prior to Nov. 23, 1953, nonrecording gage at bridge 100 ft downstream at datum 2.00 ft higher. Nov. 23, 1953, to Oct. 5, 1963, water-stage recorder at same site at datum 2.00 ft higher.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 5,410 ft3/s, Apr. 5, 1966, gage height, 18.23 ft; no flow at times.

Annual mean discharge

Annual mean discharge 05094000 SOUTH BRANCH TWO RIVERS AT LAKE BRONSON, MN
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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      153       1958            0.400     1991            19.5        34.2        1.75       1.74
November     97.0      1995            0.381     1990            13.0        22.2        1.71       1.15
December     34.5      1992            0.131     1987            4.83        5.73        1.19       0.43
January      12.1      1992            0.116     1987            2.90        2.62        0.90       0.26
February     23.6      1981            0.120     1987            3.42        4.09        1.20       0.30
March        690       1995            0.658     1934            69.9        124         1.77       6.22
April        1,980     1966            0.539     1991            428         418         0.98       38.1
May          1,500     1996            0.984     1991            219         320         1.46       19.4
June         1,340     1970            1.43      1980            161         263         1.63       14.3
July         1,140     1956            0.437     1988            110         218         1.98       9.79
August       1,350     1993            0.089     1988            48.6        185         3.80       4.33
September    525       1957            0         1937            44.3        104         2.36       3.94
Annual       312       1966            2.89      1934            94.3        80.8        0.86       100

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Annual flow duration

Annual flow duration 05094000 SOUTH BRANCH TWO RIVERS AT LAKE BRONSON, MN
----------------------------------------------------------------------------------------------------------------------
                              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           0.25    0.18    0.46    2.10     2.20     1.10    0.53    0.24    0.32    0.41    0.38    0.36    0.41
  90           0.34    0.38    0.63    4.51     3.74     2.00    1.40    0.71    0.60    0.84    0.47    0.43    0.59
  85           0.47    0.55    1.10    8.84     5.01     3.98    1.90    1.00    0.81    1.10    0.75    0.51    0.86
  80           0.55    0.80    1.60    16.8     7.92     5.05    2.99    1.50    1.10    1.40    0.95    0.74    1.30
  75           1.00    0.97    1.60    26.4     12.8     5.77    3.87    1.50    1.50    1.70    1.20    1.50    1.80
  70           1.40    1.20    1.60    36.4     17.7     8.39    4.40    2.10    1.50    1.70    1.90    1.80    1.80
  65           1.40    1.40    2.10    56.4     22.6     12.1    5.27    2.10    2.00    2.20    2.40    1.80    2.77
  60           1.70    1.70    2.10    81.4     28.2     14.8    6.64    2.10    2.00    2.80    2.40    2.20    3.24
  55           2.00    1.70    3.18    111      34.3     18.6    8.02    3.43    2.87    3.50    3.00    2.60    3.92
  50           2.00    1.70    3.60    147      44.5     24.0    11.0    3.86    3.34    4.48    3.00    2.60    4.42
  45           2.30    2.10    4.11    189      63.9     31.4    14.6    4.51    3.80    4.93    4.11    2.60    5.64
  40           2.30    2.10    4.87    239      89.1     42.2    18.3    4.95    4.54    5.38    4.59    3.20    7.14
  35           2.70    2.50    6.25    305      121      57.8    22.8    6.57    5.73    6.48    5.25    3.80    10.6
  30           2.70    3.00    11.0    389      178      83.9    31.9    7.85    8.10    9.55    6.37    4.50    16.7
  25           3.20    3.00    16.9    508      257      144     49.9    11.4    13.8    13.0    9.27    4.50    26.5
  20           3.80    3.70    34.3    689      337      217     81.0    17.2    22.9    20.0    14.5    6.83    47.6
  15           5.20    4.50    58.8    946      424      304     137     29.0    44.1    29.7    23.7    8.68    96.9
  10           6.47    6.83    147     1,280    643      430     238     76.1    106     53.9    34.4    12.3    215
  5            9.20    10.6    499     1,950    1,030    770     655     217     242     103     58.3    16.3    532

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                            Probability of annual high discharges
                                  [ng, statistic not given]
__________________________________________________________________________________________________

                                                       Maximum average 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              60.7        43.7          26.5           16.8
  0.95         1.05         344             176         136           89.9           57.2
  0.90         1.11         476             292         233           159            102
  0.80         1.25         692             507         419           296            191
  0.50         2            1,350           1,240       1,070         788            516
  0.20         5            2,480           2,470       2,170         1,630          1,090
  0.10         10           3,330           3,280       2,910         2,190          1,470
  0.04         25           4,470           4,240       3,760         2,810          1,910
  0.02         50           5,360           4,880       4,310         3,210          2,200
  0.01         100          6,260           5,440       4,790         3,550          2,450
  0.005        200          7,190           5,940       5,220         3,840          2,670
  0.002        500          8,450           ng          ng            ng             ng

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-------------------------------------------------------------------------------------
           Annual peak discharge and corresponding gage height, period of record
                                 [--, 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

1929    March 20        9.00     940        1968    July 19         11.08    2,290
1930    May 15          10.90    1,820      1969    April 14        14.01    3,520
1931    April 9         6.00     300        1970    April 14        14.51    4,140
1932    April 11        9.70     1,310      1971    April 8         9.00     1,500
1933    April 4         7.58     415        1972    April 15        8.50     1,480
1934    April 10        5.00     64.0       1973    March 14        10.18    800
1935    April 13        7.21     565        1974    April 24        11.35    2,460
1936    April 19        6.64     358        1975    July 6          10.37    1,960
1937    May 4           7.02     594        1976    April 1         7.24     980
1941    April 11        10.09    1,580      1977    April 8         5.06     219
1942    April 1         12.05    2,210      1978    April 12        12.12    2,770
1943    April 11        8.31     1,050      1979    April 22        13.17    3,340
1944    June 12         7.46     820        1980    April 8         6.90     820
1945    April 16        6.96     670        1981    June 30         5.39     340
1946    March 26        7.03     668        1982    April 2         7.94     1,040
1947    June 17         9.07     1,290      1983    March 8         9.33     1,530
1954    June 16         7.03     567        1984    April 3         6.45     623
1955    June 9          8.33     1,020      1985    June 26         12.16    2,790
1956    April 24        12.79    2,650      1986    March 29        11.47    2,510
1957    July 8          10.52    1,810      1987    March 27        7.62     996
1958    September 23    6.29     355        1988    March 24        8.46     1,170
1959    April 8         8.60     1,110      1989    April 19        10.78    2,100
1960    April 11        8.72     1,270      1990    April 1         7.10     784
1961    March 26        6.86     451        1991    July 13         11.35    2,160
1962    June 13         12.82    2,960      1992    April 2         10.82    1,870
1963    April 8         7.56     1,570      1993    August 10       12.87    3,050
1964    June 14         10.88    2,210      1994    March 26      --         850
1965    April 15        12.30    2,780      1995    March 28        10.56    2,080
1966    April 5         18.23    5,410      1996    April 22        14.45    4,290
1967    April 21        11.43    2,430      1997    April 20        14.58    4,260

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

1966    April 5         18.23    5,410      1974    April 24        11.35    2,460
1996    April 22        14.45    4,290      1967    April 21        11.43    2,430
1997    April 20        14.58    4,260      1968    July 19         11.08    2,290
1970    April 14        14.51    4,140      1942    April 1         12.05    2,210
1969    April 14        14.01    3,520      1964    June 14         10.88    2,210
1979    April 22        13.17    3,340      1991    July 13         11.35    2,160
1993    August 10       12.87    3,050      1989    April 19        10.78    2,100
1962    June 13         12.82    2,960      1995    March 28        10.56    2,080
1985    June 26         12.16    2,790      1975    July 6          10.37    1,960
1965    April 15        12.30    2,780      1992    April 2         10.82    1,870
1978    April 12        12.12    2,770      1930    May 15          10.90    1,820
1956    April 24        12.79    2,650      1957    July 8          10.52    1,810
1986    March 29        11.47    2,510      1941    April 11        10.09    1,580
1963    April 8         7.56     1,570      1980    April 8         6.90     820
1983    March 8         9.33     1,530      1973    March 14        10.18    800
1971    April 8         9.00     1,500      1990    April 1         7.10     784
1972    April 15        8.50     1,480      1945    April 16        6.96     670
1932    April 11        9.70     1,310      1946    March 26        7.03     668
1947    June 17         9.07     1,290      1984    April 3         6.45     623
1960    April 11        8.72     1,270      1937    May 4           7.02     594
1988    March 24        8.46     1,170      1954    June 16         7.03     567
1959    April 8         8.60     1,110      1935    April 13        7.21     565
1943    April 11        8.31     1,050      1961    March 26        6.86     451
1982    April 2         7.94     1,040      1933    April 4         7.58     415
1955    June 9          8.33     1,020      1936    April 19        6.64     358
1987    March 27        7.62     996        1958    September 23    6.29     355
1976    April 1         7.24     980        1981    June 30         5.39     340
1929    March 20        9.00     940        1931    April 9         6.00     300
1994    March 26      --         850        1977    April 8         5.06     219
1944    June 12         7.46     820        1934    April 10        5.00     64.0

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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
__________________________________________________________________________________________________________________________________

1929    10.0     8.13     3.71     2.16     2.00     311.9    160.7    36.1     23.0     7.39     1.00     1.50     47.7
1930    5.50     4.93     2.82     1.98     1.00     1.52     159.6    440.5    20.3     14.4     3.72     3.37     55.5
1931    4.94     4.19     2.95     2.16     2.00     24.9     83.1     15.6     8.97     4.98     4.45     3.47     13.4
1932    4.44     5.41     4.42     3.48     2.43     2.55     360.8    117.3    8.06     4.41     4.91     2.16     43.0
1933    2.88     3.87     2.74     2.00     1.36     14.6     191.5    21.2     14.2     2.28     2.46     2.25     21.6

1934    1.62     1.25     0.665    0.465    0.400    0.658    20.0     2.85     1.83     1.37     1.82     1.99     2.89
1935    4.60     3.72     2.24     1.00     0.800    29.5     163.8    35.4     7.24     4.46     1.92     2.84     21.4
1936    3.25     3.47     2.24     1.74     1.50     2.10     83.4     18.8     2.93     1.69     3.91     2.55     10.5
1937    23.9   --       --       --       --       --       --         182.1    13.9     2.30     1.65     0      --
1941  --       --       --       --       --       --         453.9    41.2     178.2    11.6     4.80     19.7   --

1942    131.1    23.6     5.99     3.00     2.57     154.4    675.4    456.5    45.7     5.83     15.6     35.0     129.9
1943    6.85     3.36     2.03     1.71     2.59     35.3     459.0    253.9    607.3    113.7    7.80     1.54     124.0
1944    0.887  --       --       --       --       --         79.9     13.2     402.7    55.9     11.5     14.0   --
1945    6.65     23.0     11.6   --       --       --         417.9    197.5    44.0     16.2     9.47     51.5   --
1946    34.2     12.6     5.58     3.41     2.41     220.4    248.4    29.8     5.76     15.0     3.72     2.99     48.9

1947    1.24     3.34     5.08     3.20     1.38     12.5     184.4    33.8     478.3    32.3     43.1     12.2     67.0
1954    5.32     0.867    1.16     2.45     6.36     2.80     208.5    135.2    167.7    9.79     5.51     3.97     45.6
1955    4.94     4.00     2.98     2.72     2.46     14.9     256.8    70.0     369.6    24.9     4.53     5.06     63.0
1956    8.25     3.78     3.30     3.58     3.88     34.2     711.8    445.2    192.5    1,136    40.6     97.6     224.3
1957    10.6     87.5     9.87     7.42     5.51     158.8    263.4    108.7    233.5    725.1    116.7    524.6    188.1

1958    153.0    77.0     13.8     8.48     2.12     2.16     47.7     14.8     6.74     98.7     4.77     9.68     36.9
1959    1.74     1.12     0.555    0.265    0.218    26.3     372.7    74.4     42.6     11.7     2.31     6.24     44.7
1960    22.4     11.3     4.30     4.78     4.79     4.95     534.2    55.2     53.5     13.1     3.86     1.33     58.8
1961    2.77     2.03     1.67     1.44     13.5     26.7     23.1     14.0     2.74     4.50     2.65     0.757    7.96
1962    2.54     1.36     4.43     3.63     3.21     30.3     369.6    655.4    1,031    109.5    77.3     11.8     191.4

1963    7.15     9.85     3.40     1.32     1.01     28.9     287.2    23.9     20.8     4.50     3.43     3.17     32.6
1964    2.59     1.21     0.745    0.600    0.600    0.765    196.3    118.8    742.9    40.2     7.09     6.72     92.2
1965    4.92     6.05     4.77     4.65     4.53     4.52     907.0    403.9    188.4    57.8     6.00     34.3     135.0
1966    99.4     16.0     13.8     10.8     8.91     11.7     1,977    913.2    250.3    282.9    124.9    41.6     312.2
1967    10.2     3.23     3.28     1.71     1.16     22.7     1,157    664.5    110.0    4.38     5.70     2.84     165.2

1968    2.07     2.79     2.26     1.55     1.35     125.3    69.0     5.66     502.8    707.0    193.9    239.7    154.7
1969    74.9     31.1     9.92     5.43     4.83     3.31     1,158    299.1    104.3    10.6     4.45     6.21     141.8
1970    3.71     2.45     2.07     1.97     1.67     3.06     751.4    1,338    1,336    131.1    12.3     6.55     299.1
1971    15.8     35.5     4.54     3.53     2.51     32.2     516.6    58.3     13.5     5.09     3.35     2.98     57.4
1972    2.06     11.0     4.55     2.55     2.79     65.6     444.6    42.9     31.0     4.51     3.68     4.18     51.1

1973    3.98     2.21     1.86     2.96     6.01     46.2     5.57     5.46     3.38     4.15     1.81     4.26     7.37
1974    7.94     4.78     2.59     1.86     1.70     1.61     882.1    634.7    253.2    12.3     30.4     8.30     153.2
1975    4.39     3.78     2.89     2.23     1.67     1.26     607.7    526.3    130.1    474.7    5.18     5.03     147.9
1976    4.15     3.55     3.28     1.99     1.68     59.0     207.7    10.4     7.81     4.16     3.02     3.38     25.7
1977    7.47     1.06     0.463    0.598    0.847    2.76     35.8     3.87     13.9     2.28     4.31     2.34     6.27

1978    0.780    0.420    2.06     2.52     1.85     2.04     778.3    103.1    27.9     102.3    5.51     1.33     85.1
1979    3.92     1.99     1.29     1.94     2.29     14.7     992.1    489.8    203.2    52.8     3.24     2.73     147.0
1980    5.60     0.993    2.55     2.14     1.83     3.32     216.9    4.14     1.43     3.12     1.31     0.960    20.1
1981    1.03     1.64     5.04     0.989    23.6     39.5     9.71     6.71     36.9     34.3     0.941    0.874    13.4
1982    6.13   --       --       --       --       --       --       --       --       --       --       --       --

1985  --       --       --       --       --       --         280.9    211.8    482.8    385.6    360.3    279.5  --
1986    112.9    32.6     16.8     4.82     2.54     361.8    818.6    574.8    33.6     14.0     8.53     25.6     167.9
1987    5.59     0.418    0.131    0.116    0.120    200.7    288.3    35.2     9.43     7.52     1.29     0.656    45.8
1988    0.430    1.55     1.38     0.661    0.600    253.3    165.2    4.34     3.37     0.437    0.089    0.523    36.1
1989    1.57     0.503    0.549    0.338    0.177    1.49     407.2    35.9     68.0     17.3     2.99     1.10     44.3

1990    21.6     0.381    0.378    0.322    0.291    115.9    60.1     3.50     6.69     10.2     27.0     3.17     21.0
1991    0.400    0.484    0.413    0.346    2.90     10.2     0.539    0.984    13.4     527.4    27.4     217.2    67.4
1992    76.0     69.4     34.5     12.1     12.5     200.8    1,010    170.9    20.5     16.8     6.28     88.2     142.2
1993    34.6     0.527    0.443    0.472    0.520    5.93     201.1    46.2     107.8    340.4    1,349    431.6    211.9
1994    34.8     24.1     9.59     6.08     3.94     199.5    112.3    24.6     10.3     29.5     19.3     225.5    58.4

1995    65.7     97.0     13.3     6.46     3.98     689.5    187.7    259.5    42.6     245.0    119.7    18.7     147.6
1996    17.1     22.4     8.77     6.59     7.32     10.7     1,351    1,500    362.1    148.1    45.0     31.5     292.5
1997    1.94     8.51     4.02     0.191    9.58     6.42     1,352    477.0    80.7     164.7    5.64     7.82     175.9

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