05055100 NORTH FORK SHEYENNE RIVER NEAR WELLSBURG, ND

List Of Figures:

Annual mean discharge
Annual flow duration

LOCATION.--Lat 47°52'34'', long 99°43'05", at north line of sec.26, T.151 N., R.71 W., Benson County, Hydrologic Unit 09020202, on right bank 7 ft downstream from bridge on county highway, 1 mi upstream from mouth, and 3.5 mi northeast of Wellsburg.
DRAINAGE AREA.--693 mi2, of which about 490 mi2 is probably noncontributing (includes 227 mi2 in closed basins).
PERIOD OF RECORD.--September 1957 to September 1967.
GAGE.--Water-stage recorder. Altitude of gage is 1,455 ft (from topographic map).
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, about 240 ft3/s, Mar. 16, 1966; maximum gage height, 6.02 ft, Mar. 16, 1966 (backwater from ice); no flow for several months each year.

Annual mean discharge

Annual mean discharge for 05055100 North Fork Sheyenne River near Wellsburg, North Dakota 
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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      11.0      1966          0         m               1.17      3.46        2.96       2.39
November     4.00      1966          0         m               0.530     1.28        2.42       1.08
December     0.303     1966          0         m               0.040     0.10        2.72       0.07
January      ng        ng            0         m               0         0           ng           0
February     0.368     1958          0         m               0.040     0.12        3.10       0.08
March        79.5      1966          0         1961            12.5      25.7        2.06       25.6
April        42.5      1960          0.803     1961            15.6      14.2        0.91       31.9
May          25.6      1967          0.245     1959            6.96      7.70        1.11       14.2
June         14.7      1964          0         1961            5.05      5.09        1.01       10.3
July         22.3      1965          0         m               4.18      6.77        1.62       8.54
August       11.9      1963          0         m               2.04      4.30        2.11       4.16
September    8.39      1965          0         m               0.850     2.65        3.13       1.73
Annual       12.9      1966          0.095     1961            4.10      4.01        0.98       100
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Annual flow duration

Annual flow duration for 05055100 North Fork Sheyenne River near Wellsburg, North Dakota 
----------------------------------------------------------------------------------------------------------------------
                              Monthly and annual flow duration, in cubic feet per second
                                            [ng, statistic not given]
______________________________________________________________________________________________________________________

 Percentage
  of days
 discharge   Jan.    Feb.    March   April  May    June   July   Aug.   Sept.   Oct.    Nov.    Dec.   Annual
 equaled or
  exceeded
______________________________________________________________________________________________________________________

  95         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  90         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  85         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  80         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  75         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  70         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  65         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  60         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  55         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  50         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  45         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0
  40         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0.08
  35         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0.20
  30         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      0.50
  25         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      1.20
  20         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      3.45
  15         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      5.99
  10         ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      10.7
  5          ng      ng      ng      ng     ng     ng     ng     ng     ng      ng     ng     ng      21.8
______________________________________________________________________________________________________________________

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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         0.500       0.296         0.322         0.350          0.299
  0.95         1.05         2.20        1.87          1.86          1.75           1.29
  0.90         1.11         4.80        4.42          4.23          3.71           2.57
  0.80         1.25         11.5        11.2          10.3          8.41           5.51
  0.50         2            50.3        48.7          41.9          30.8           19.0
  0.20         5            175         145           119           81.2           49.8
  0.10         10           307         223           180           120            74.6
  0.04         25           527         323           257           168            107
  0.02         50           723         393           310           202            131
  0.01         100          940         455           358           231            154
  0.005        200          1,180       511           400           258            175
  0.002        500          1,510       ng            ng            ng             ng
__________________________________________________________________________________________________

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

                                    Minimum average 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     ng
0.10       10       ng     ng     ng     ng     ng     ng     ng     ng     ng
0.20       5        ng     ng     ng     ng     ng     ng     ng     ng     ng
0.50       2        ng     ng     ng     ng     ng     ng     ng     ng     ng
____________________________________________________________________________________

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

                                        Minimum average 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     0      0
0.10           10           ng     ng     ng     ng        ng     ng     0      0
0.20           5            ng     ng     ng     ng        ng     ng     0      0.035
0.50           2            ng     ng     ng     ng        ng     ng     0      0.300

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

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

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            Annual peak discharge and corresponding gage height, period of record
_____________________________________________________________________________________

                     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

1958     April 2     2.94     29.0       1963    August 3    3.52     32.0
1959     March1      2.10     4.70       1964    June 20     3.64     51.0
1960     April 2     3.39     216        1965    July 23     4.78     115
1961     April 21    1.92     1.70       1966    March 16    6.02     240
1962     March 29    2.75     51.0       1967    March 26    4.00     180

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

1966     March 16    6.02     240        1964    June 20     3.64     51.0
1960     April 2     3.39     216        1963    August 3    3.52     32.0
1967     March 26    4.00     180        1958    April 2     2.94     29.0
1965     July 23     4.78     115        1959    March1      2.10     4.70
1962     March 29    2.75     51.0       1961    April 21    1.92     1.70
_____________________________________________________________________________________
1Day of month unknown. 
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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]
__________________________________________________________________________________________________________________________________

Year     Oct.     Nov.     Dec.     Jan.  Feb.     March    April    May      June     July     Aug.    Sept.    Annual
__________________________________________________________________________________________________________________________________

 1958    0.629    1.28     0.048    0     0.368    2.21     10.1     0.586    0.084    2.47     0.007    0        1.48
 1959    0        0        0        0     0        1.99     1.60     0.245    0.020    0        0        0        0.323
 1960    0        0        0        0     0        1.00     42.5     4.73     6.02     0.203    0        0        4.48
 1961    0        0        0        0     0        0        0.803    0.345    0        0        0        0        0.095
 1962    0        0        0        0     0        5.90     6.81     7.57     4.90     1.16     0.074    0        2.21

 1963    0        0        0        0     0        0.045    4.02     4.01     0.807    2.95     11.9     0.003    2.00
 1964    0        0        0        0     0.007    0.452    13.5     4.52     14.7     4.41     0.023    0.030    3.12
 1965    0.077    0.023    0        0     0        0.045    16.9     9.49     8.21     22.3     8.12     8.39     6.15
 1966    11.0     4.00     0.303    0     0        79.5     27.3     12.5     11.0     7.27     0.247    0.049    12.9
 1967    0        0        0        0     0        34.0     32.4     25.6     4.73     1.02     0        0        8.20
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