05089100 MIDDLE BRANCH PARK RIVER NEAR UNION, ND

List Of Figures:

Annual mean discharge
Annual flow duration

LOCATION.--Lat 48°32'32'', long 98°01'10", on north line of sec. 5, T.158 N., R.57 W., Walsh County, Hydrologic Unit 09020310, on left bank 150 ft downstream from bridge on county highway between Walsh and Cavalier counties, and 3.5 mi southwest of Union.
DRAINAGE AREA.--15.3 mi2.
PERIOD OF RECORD.--October 1965 to September 1986. Seasonal records only since 1983.
GAGE.--Water-stage recorder. Datum of gage is 1,495 ft above sea level, from topographic map.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 960 ft3/s, Apr. 20, 1979, gage height, 6.16 ft, backwater from ice; maximum gage height, 7.51 ft, May 4, 1966, from floodmark, backwater from snowdrift; no flow for several months each year.

Annual mean discharge

Annual mean discharge for 05089100 Middle Branch Park River near Union, North Dakota

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                              Statistics of monthly and annual mean discharges
                                    [m, more than 1 year of occurrence]
__________________________________________________________________________________________________________

                  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      1.45      1966          0.032     1968            0.260      0.36        1.39       1.09
November     0.539     1966          0.021     1977            0.120      0.16        1.29       0.51
December     0.164     1978          0         m               0.030      0.05        1.47       0.14
January      0.055     1978          0         m               0          0.01        3.15       0.02
February     2.91      1981          0         m               0.170      0.71        4.12       0.71
March        23.0      1972          0         m               3.95       5.82        1.47       16.5
April        60.0      1979          0.242     1973            14.6       15.9        1.09       60.9
May          17.8      1967          0.039     1973            2.46       4.26        1.73       10.3
June         6.12      1986          0.018     1973            1.13       1.71        1.51       4.73
July         5.46      1966          0.010     1973            0.950      1.65        1.74       3.95
August       0.351     1980          0.351     1980            0.120      0.11        0.93       0.50
September    1.31      1980          0         1984            0.160      0.28        1.78       0.66
Annual       5.35      1979          0.381     1977            2.18       1.48        0.68       100
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Annual flow duration

Annual flow duration for 05089100 Middle Branch Park River near Union, North Dakota

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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       0.05    0       0       0.04    0       0       0       0       0.02    0       0       0
  90           0       0.10    0       0.13    0.06    0.02    0       0       0       0.03    0       0       0
  85           0       0.15    0       0.17    0.08    0.03    0       0       0       0.04    0.02    0       0
  80           0       0.21    0       0.23    0.11    0.05    0.02    0       0.02    0.04    0.02    0       0
  75           0       0.26    0       0.40    0.11    0.05    0.02    0       0.03    0.05    0.03    0       0
  70           0       0.31    0       0.54    0.15    0.07    0.02    0.02    0.03    0.06    0.04    0       0
  65           0       0.36    0       0.72    0.15    0.07    0.03    0.02    0.04    0.06    0.04    0       0.02
  60           0       0.41    0       0.96    0.20    0.09    0.04    0.03    0.04    0.06    0.05    0       0.03
  55           0       0.46    0       1.30    0.20    0.09    0.04    0.03    0.04    0.06    0.05    0       0.04
  50           0       0.52    0       1.70    0.27    0.12    0.06    0.05    0.06    0.08    0.06    0       0.05
  45           0       0.57    0       3.09    0.36    0.12    0.06    0.06    0.07    0.08    0.06    0       0.07
  40           0       0.62    0.06    3.92    0.49    0.16    0.08    0.07    0.07    0.10    0.07    0.02    0.07
  35           0       0.67    0.44    4.94    0.66    0.21    0.10    0.07    0.09    0.12    0.08    0.03    0.10
  30           0       0.72    0.79    6.27    0.66    0.27    0.13    0.09    0.10    0.14    0.10    0.03    0.14
  25           0       0.77    1.90    8.97    0.89    0.27    0.17    0.10    0.12    0.22    0.13    0.04    0.20
  20           0       0.82    2.50    12.6    1.20    0.36    0.29    0.12    0.12    0.22    0.17    0.04    0.38
  15           0       0.88    4.82    18.4    1.60    0.63    0.49    0.15    0.17    0.40    0.22    0.05    0.53
  10           0       0.93    8.39    30.0    3.23    1.40    1.10    0.18    0.35    0.60    0.37    0.15    1.40
  5            0.02    0.98    17.2    60.0    5.89    4.55    3.96    0.30    0.60    0.74    0.48    0.19    5.68
______________________________________________________________________________________________________________________

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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         22.5        4.83          2.71          1.60           1.08
  0.95         1.05         42.9        10.1          6.39          3.92           2.60
  0.90         1.11         60.3        15.0          9.92          6.14           4.03
  0.80         1.25         90.8        24.3          16.6          10.3           6.65
  0.50         2            197         62.1          42.5          25.5           15.8
  0.20         5            422         162           102           57.3           33.5
  0.10         10           626         268           158           84.1           47.6
  0.04         25           949         463           246           123            67.0
  0.02         50           1,240       661           324           155            82.3
  0.01         100          1,570       913           413           189            97.8
  0.005        200          1,960       1,230         513           225            114
  0.002        500          2,540       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    0     0.015
0.10       10       ng    ng    ng    ng    ng    ng    ng    0     0.017
0.20       5        ng    ng    ng    ng    ng    ng    ng    0     0.021
0.50       2        ng    ng    ng    ng    ng    ng    ng    0     0.036
____________________________________________________________________________________

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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     0      0      0
0.10           10           ng      ng      ng     ng         ng     0      0      0
0.20           5            ng      ng      ng     ng         ng     0      0      0.029
0.50           2            ng      ng      ng     ng         ng     0      0      0.129

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

0.05           20           0       0       0      0          0      0      0      0.011
0.10           10           0       0       0      0          0      0      0      0.015
0.20           5            0       0       0      0.009      0      0      0      0.020
0.50           2            0.008   10.013   0.018  0.030      0.008  0.015  0.025  0.043
_______________________________________________________________________________________
1Graphical interpretation.

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               Annual peak discharge and corresponding gage height
_____________________________________________________________________________________

                     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

1966     May 4       7.51     200          1977    May 19      3.33     108
1967     May 6       7.22     687          1978    April 6     5.91     300
1968     May 14      5.44     75.0         1979    April 20    6.16     960
1969     April 11    7.10     506          1980    May 26      3.67     112
1970     April 24    6.07     243          1981    June 27     3.42     90.0
1971     April 9     7.00     650          1982    July 24     3.71     94.0
1972     March 16    6.07     385          1983    April 5     3.83     91.0
1973     March 13    4.55     51.0         1984    July 14     3.38     71.0
1974     April 15    6.75     450          1985    March 17    4.07     85.0
1975     April 15    5.00     74.0         1986    June 20     5.38     507
1976     June 12     3.37     285

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

1979     April 20    6.16     960          1980    May 26      3.67     112
1967     May 6       7.22     687          1977    May 19      3.33     108
1971     April 9     7.00     650          1982    July 24     3.71     94.0
1986     June 20     5.38     507          1983    April 5     3.83     91.0
1969     April 11    7.10     506          1981    June 27     3.42     90.0
1974     April 15    6.75     450          1985    March 17    4.07     85.0
1972     March 16    6.07     385          1968    May 14      5.44     75.0
1978     April 6     5.91     300          1975    April 15    5.00     74.0
1976     June 12     3.37     285          1984    July 14     3.38     71.0
1970     April 24    6.07     243          1973    March 13    4.55     51.0
1966     May 4       7.51     200
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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
__________________________________________________________________________________________________________________________________

1966    1.45     0.539    0.079    0        0       12.0     11.7     7.63     0.337    5.46     0.097    0.045    3.31
1967    0.109    0.027    0        0        0       8.27     14.9     17.8     0.067    0.025    0.024    0.016    3.46
1968    0.032    0.120    0.012    0        0       10.1     1.19     2.18     0.261    0.063    0.209    0.160    1.21
1969    0.058    0.044    0        0        0       0        23.1     0.142    0.155    0.052    0.002    0.011    1.94
1970    0.059    0.051    0.031    0        0       0.051    24.2     1.07     0.174    0.291    0.341    0.041    2.17

1971    0.045    0.086    0.013    0        0       0.005    32.5     0.181    4.07     4.15     0.243    0.063    3.41
1972    0.335    0.037    0.017    0        0       23.0     11.4     0.435    0.203    0.092    0.015    0.074    2.99
1973    0.181    0.045    0        0        0       4.30     0.242    0.039    0.018    0.010    0.057    0.175    0.429
1974    0.178    0.103    0.043    0.004    0       0        47.1     9.06     0.135    0.034    0.102    0.086    4.70
1975    0.100    0.056    0.013    0        0       0.043    6.30     1.38     1.33     0.772    0.071    0.076    0.840

1976    0.051    0.052    0.030    0.014    0       0.365    13.3     0.114    4.33     0.022    0.004    0.013    1.50
1977    0.068    0.021    0        0        0       1.01     1.20     1.51     0.087    0.179    0.040    0.413    0.381
1978    0.402    0.215    0.164    0.055    0       0.281    23.7     1.61     0.307    0.200    0.050    0.125    2.24
1979    0.082    0.046    0.001    0        0       0        60.0     3.89     0.379    0.428    0.035    0.035    5.35
1980    0.047    0.035    0.008    0        0       0.481    3.60     1.23     0.213    0.032    0.351    1.31     0.605

1981    0.621    0.506    0.145    0        2.91    3.88     1.60     0.419    2.54     0.374    0.269    0.273    1.11
1982    0.627    0.095    0.019    0        0       0.144    9.42     1.64     1.84     3.36     0.180    0.056    1.44
1983    --       --       --       --       --      3.29     10.9     0.362    0.680    0.102    0.025    0.216    --
1984    --       --       --       --       --      2.27     3.29     0.181    0.105    0.452    0.058    0        --
1985    --       --       --       --       --      9.85     3.42     0.195    0.441    0.114    0.232    0.114    --
1986    --       --       --       --       --      3.67     3.74     0.625    6.12     3.69     0.115    0.038    --
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