05093000 SOUTH BRANCH TWO RIVERS AT PELAN, MN

List Of Figures:

Annual mean discharge
Annual flow duration

LOCATION.--Lat 48°38'45'', long 96°23'15", in NW1/4 sec.31, T.160 N., R.44 W., Kittson County, Hydrologic Unit 09020312, on left bank 40 ft downstream from bridge on State Highway 11 and 0.25 mi west of Pelan.
DRAINAGE AREA.--281 mi2.
PERIOD OF RECORD.--August 1928 to September 1938, October 1953 to November 1956. Monthly discharge only for some periods, published in WSP 1308. Published as South Fork Two Rivers at Pelan 1928-38.
GAGE.--Water-stage recorder. Datum of gage is 1,028.23 ft above mean sea level. Prior to Mar. 24, 1936, chain gage at site 500 ft upstream at same datum. Mar. 24, 1936, to Sept. 30, 1938, chain gage at site 40 ft upstream at same datum.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,040 ft3/s, July 10, 1956, gage height, 10.90 ft; no flow at times each year.

Annual mean discharge

Annual mean streamflow for 05093000 South Branch Two Rivers at Pelan, Minnesota

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                              Statistics of monthly and annual mean discharges
                         [m, more than 1 year of occurrence; ng, statistic not given]
__________________________________________________________________________________________________________

                  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      5.22      1929            0         m            0.670       1.57        2.35       0.24
November     54.9      1957            0         m            4.12        14.6        3.55       1.50
December     1.00      1929            0         m            0.090       0.28        3.14       0.03
January      0         m               0         m            0           0         ng           0
February     0         m               0         m            0           0         ng           0
March        193       1929            0         m            17.5        53.0        3.03       6.36
April        345       1956            7.40      1938         89.8        97.1        1.08       32.6
May          278       1930            0.477     1934         68.2        80.7        1.18       24.7
June         243       1955            0.040     1934         32.8        68.1        2.08       11.9
July         699       1956            0         1934         55.8        193         3.46       20.2
August       18.2      1956            0         m            2.75        6.18        2.25       1.00
September    43.5      1956            0         m            3.97        11.8        2.97       1.44
Annual       111       1956            0.766     1934         22.5        28.6        1.27       100
__________________________________________________________________________________________________________

Annual flow duration

Annual flow duration for 05093000 South Branch Two Rivers at Pelan, 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     0     0.05    0       0.50    0       0       0       0       0       0       0       0
  90           0     0     0.05    0.32    1.10    0       0       0       0       0       0       0       0
  85           0     0     0.05    1.00    3.10    0.17    0       0       0       0       0       0       0
  80           0     0     0.05    1.80    4.70    0.30    0       0       0       0       0       0       0
  75           0     0     0.05    3.70    5.90    0.40    0       0       0       0       0       0       0
  70           0     0     0.05    5.97    7.76    0.69    0       0       0       0       0       0       0
  65           0     0     0.05    12.0    9.12    1.20    0       0       0       0       0       0       0
  60           0     0     0.05    21.3    10.4    2.10    0.10    0       0       0       0       0       0
  55           0     0     0.05    27.8    12.9    2.10    0.18    0       0       0       0       0       0
  50           0     0     0.05    34.5    15.7    3.74    0.33    0       0       0       0       0       0
  45           0     0     0.05    41.6    18.2    4.26    0.60    0       0       0       0       0       0
  40           0     0     0.05    49.3    21.8    5.24    0.60    0.10    0       0       0       0       0.10
  35           0     0     0.05    57.2    26.5    7.92    1.10    0.10    0       0       0       0       0.18
  30           0     0     0.05    72.6    36.4    12.6    1.50    0.25    0       0       0       0       0.60
  25           0     0     0.05    95.4    55.2    15.8    2.00    0.78    0       0.10    0.10    0       2.00
  20           0     0     0.05    122     78.7    19.0    4.32    1.10    0.10    0.80    0.25    0       5.18
  15           0     0     1.90    152     128     30.7    8.34    5.55    0.48    0.80    0.49    0.10    12.6
  10           0     0     10.5    184     179     56.0    18.0    9.55    6.21    2.90    1.90    0.10    29.4
  5            0     0     78.7    353     293     203     373     17.3    19.0    4.90    15.3    0.20    104
______________________________________________________________________________________________________________________

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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         20.4        18.0          13.9          7.56           3.95
  0.95         1.05         52.5        45.7          37.4          22.8           13.4
  0.90         1.11         84.9        73.6          61.4          39.2           24.0
  0.80         1.25         149         129           109           72.4           45.9
  0.50         2            410         358           301           205            132
  0.20         5            1,040       931           748           496            306
  0.10         10           1,650       1,490         1,160         742            439
  0.04         25           2,620       2,430         1,790         1,090          609
  0.02         50           3,500       3,290         2,330         1,370          731
  0.01         100          4,500       4,290         2,930         1,650          846
  0.005        200          5,620       5,450         3,590         1,940          954
  0.002        500          7,310       ng            ng            ng             ng
__________________________________________________________________________________________________

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                    Probability of occurrence of annual low discharges
                                [ng, statistic not given]
____________________________________________________________________________________

                                     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       ng     ng    ng    ng    ng    ng    ng    ng    0
0.10       10       ng     ng    ng    ng    ng    ng    ng    ng    0
0.20       5        ng     ng    ng    ng    ng    ng    ng    ng    0
0.50       2        ng     ng    ng    ng    ng    ng    ng    ng    0
____________________________________________________________________________________

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                   Probability of occurrence of seasonal low discharges
                               [ng, statistic not given]
_____________________________________________________________________________________

                                         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           ng    ng    ng    ng            ng    ng    ng    0
0.10           10           ng    ng    ng    ng            ng    ng    ng    0
0.20           5            ng    ng    ng    ng            ng    ng    ng    0
0.50           2            ng    ng    ng    ng            ng    ng    ng    0

                              June-July-August           September-October-November
                            ________________________      _________________________

0.05           20           ng    ng    0     0             ng    ng    ng    ng
0.10           10           ng    ng    0     0             ng    ng    ng    ng
0.20           5            ng    ng    0     0             ng    ng    ng    ng
0.50           2            ng    ng    0     0.017         ng    ng    ng    ng
_____________________________________________________________________________________

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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

1929     March 21    6.40     718           1936    April 20    3.25     178
1930     May 13      10.18    1,810         1937    May 3       5.00     506
1931     April 7   --         77.0          1938    May 13      4.04     285
1932     April 9     8.02     1,140         1954    June 18     3.70     266
1933     April 3     4.90     242           1955    June 7      8.07     1,040
1934     April 8     2.44     46.0          1956    July 10     10.90    2,040
1935     March 29    5.24     242

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

1956     July 10     10.90    2,040      1954       June 18     3.70     266
1930     May 13      10.18    1,810      1933       April 3     4.90     242
1932     April 9     8.02     1,140      1935       March 29    5.24     242
1955     June 7      8.07     1,040      1936       April 20    3.25     178
1929     March 21    6.40     718        1931       April 7   --         77.0
1937     May 3       5.00     506        1934       April 8     2.44     46.0
1938     May 13      4.04     285
_____________________________________________________________________________________

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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
__________________________________________________________________________________________________________________________________

1928  --       --       --       --    --    --       --       --       --       --         16.3     11.7   --
1929    5.22     2.15     1.00     0     0     192.9    64.5     19.6     9.30     0.977    0.013    0        24.9
1930    0        0        0        0     0     0        67.7     277.8    9.33     5.58     0.023    0        30.4
1931    0        0        0        0     0     4.57     18.2     6.75     2.73     0.858    0.203    0        2.77
1932    0        0        0        0     0     0.613    239.2    72.5     1.03     0.242    1.85     0.143    26.1

1933    0.100    0        0        0     0     3.92     80.0     8.48     3.98     0.016    0        0        7.97
1934    0        0        0        0     0     0        8.79     0.477    0.040    0        0        0        0.766
1935    0        0        0        0     0     21.7     85.0     17.2     2.47     0.287    0        0        10.5
1936    0        0        0        0     0     0        52.2     6.67     0.270    0        0        0        4.87
1937    0        0        0        0     0     0        23.9     111.8    6.98     8.53     0.952    0        12.8

1938    0        0        0        0     0     4.01     7.40     92.2     6.68     0.039    0        0        9.33
1954    0.800    0.467    0.100    0     0     0        97.9     73.4     82.9     4.15     0.910    0.170    21.6
1955    0        0.047    0.023    0     0     0        76.9     32.3     243.4    5.54     0.048    0.020    29.5
1956    0.019    0.113    0.016    0     0     0        345.0    167.1    56.7     698.9    18.2     43.5     111.4
1957    3.25     54.9   --       --    --    --       --       --       --       --       --       --       --
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