05101000 TONGUE RIVER AT AKRA, ND


List Of Figures:

Annual mean discharge
Annual flow duration


LOCATION.--Lat 4846'42'', long 9744'43", in SW1/4 sec.10, T.161 N., R.55 W., Pembina County, Hydrologic Unit 09020313, on left bank 300 ft downstream from Renwick Dam, 0.9 mi northwest of Akra, and 6 mi west of Cavalier.
DRAINAGE AREA.--160 mi2.
PERIOD OF RECORD.--April to June 1950 (Water Supply Paper 1137-B), October 1951 to current year. Seasonal record since 1983.
GAGE.--Water-stage recorder. Datum of gage is 930.00 ft above sea level. Prior to July 10, 1954, nonrecording gage 1.2 mi downstream at datum 30.00 ft lower. July 23, 1954, to Dec. 19, 1973, water stage recorder 2.7 mi downstream at datum 9.10 ft lower.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 11,800 ft3/s, Apr. 18, 1950, site and datum then in use, from indirect measurement of peak flow, gage height, 48.70 ft, from floodmark; no flow at times.

Annual mean discharge

Annual mean discharge for 05101000 Tongue River at Akra, North Dakota
Post-regulation period, 1955-97
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                    Statistics of monthly and annual mean discharges, post-regulation period
__________________________________________________________________________________________________________

                  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      30.1      1981            0.513     1962            6.70        6.60        0.98       2.45
November     22.7      1981            0.560     1976            7.26        5.17        0.71       2.65
December     12.9      1971            0.700     1976            4.82        3.25        0.68       1.76
January      7.27      1971            1.23      1955            3.42        1.70        0.50       1.25
February     18.7      1981            0.571     1962            3.91        3.58        0.92       1.43
March        135       1966            0.216     1964            24.0        30.6        1.28       8.75
April        318       1997            0.428     1991            117         97.8        0.84       42.8
May          293       1997            1.63      1980            56.8        73.2        1.29       20.8
June         78.7      1964            0.473     1988            18.3        18.9        1.03       6.69
July         216       1997            0.086     1978            16.9        35.6        2.11       6.17
August       144       1993            0.208     1988            7.98        21.8        2.73       2.92
September    28.3      1980            0.096     1989            6.62        7.30        1.10       2.42
Annual       50.1      1956            3.11      1961            22.9        14.1        0.62       100

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Annual flow duration

Annual flow duration for 05101000 Tongue River at Akra, North Dakota
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                   Monthly and annual flow duration, in cubic feet per second, post-regulation period
______________________________________________________________________________________________________________________

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

  95           0.97    0.60    0.16    0.47    2.10    0.30    0.13    0.16    0.14    0.47    1.10    0.64    0.47
  90           1.20    0.70    0.43    1.90    4.23    1.40    0.45    0.40    0.24    0.69    1.40    1.20    0.67
  85           1.30    1.10    1.20    6.34    5.61    1.90    1.10    0.54    0.44    1.00    1.80    1.30    0.96
  80           1.60    1.30    1.50    9.74    6.65    3.14    1.50    0.73    0.58    1.30    2.20    1.70    1.40
  75           1.80    1.50    1.50    13.0    8.41    3.70    2.10    0.98    0.78    1.50    2.20    1.90    1.90
  70           2.00    1.80    1.90    16.9    10.3    4.29    2.10    1.30    1.00    1.80    2.80    2.40    1.90
  65           2.00    1.80    3.10    21.5    13.1    5.15    3.27    1.30    1.40    2.20    2.80    2.80    2.89
  60           2.40    1.80    3.10    26.8    15.6    5.67    3.70    1.80    1.90    2.70    3.60    3.10    3.30
  55           2.40    2.10    4.29    33.2    18.2    7.24    4.19    1.80    2.50    3.30    4.68    3.10    3.90
  50           3.00    2.50    5.18    46.7    20.9    8.40    4.73    2.40    2.50    3.30    5.09    3.50    4.32
  45           3.30    2.90    5.85    60.4    24.1    10.5    6.04    2.40    3.83    4.00    5.49    4.00    4.75
  40           3.30    3.40    8.72    76.7    29.0    12.4    7.10    3.42    4.56    5.17    6.36    4.50    6.14
  35           3.70    3.40    13.4    95.0    35.7    14.4    8.09    3.92    5.36    5.84    7.41    4.50    7.15
  30           4.10    4.00    18.2    118     44.7    16.4    9.06    4.57    6.82    6.55    7.89    5.70    9.49
  25           4.50    4.00    25.0    147     57.2    20.5    12.3    5.29    7.80    7.74    9.43    5.70    12.6
  20           4.50    4.00    32.7    183     73.7    26.2    15.9    7.42    9.71    9.93    11.0    6.50    16.8
  15           5.00    5.90    42.8    261     100     34.0    21.1    9.73    12.5    12.8    13.9    7.95    24.7
  10           5.60    6.91    56.1    381     157     48.7    29.9    13.0    16.9    15.7    16.6    9.57    43.8
  5            6.80    11.5    116     511     283     74.9    53.9    19.9    24.6    21.3    21.3    13.3    108

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                   Probability of annual high discharges, post-regulation period
                                  [ng, statistic not given]
__________________________________________________________________________________________________

                                                       Maximum average discharge
                                                               (ft3/s)1
                                       ___________________________________________________________

             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         12.3            211.8       10.9          8.45           5.87
  0.95         1.05         34.5            233.7       32.3          23.9           16.4
  0.90         1.11         56.9            255.7       54.2          39.6           27.1
  0.80         1.25         100             298.0       95.8          69.4           47.3
  0.50         2            261             2251        242           177            121
  0.20         5            582             2560        502           380            261
  0.10         10           836             789         682           532            368
  0.04         25           1,180           1,030       900           727            507
  0.02         50           1,450           1,190       1,050         870            610
  0.01         100          1,710           1,330       1,190         1,010          711
  0.005        200          1,970           1,460       1,310         1,140          808
  0.002        500          2,310           ng          ng            ng             ng
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1 Statistics computed using period of daily value record 1955-82.
2Statistical adjustment based on correlation between 3-, 7-, 15-, and 30-consecutive-day periods.
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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

1950    April 18    48.70    11,800     1975    April 25    10.38    76.0
1952    April 1     38.48    260        1976    April 9     13.31    313
1953    May 31      35.86    178        1977    July 18     10.40    64.0
1954    June 12     35.53    187        1978    April 10    14.28    429
1955    April 2     13.23    700        1979    April 22    16.75    900
1956    April 19    14.23    1,350      1980    April 6     11.86    180
1957    March 22    6.12     340        1981    March 25    10.73    76.0
1958    July 5      2.38     78.0       1982    April 14    12.95    308
1959    April 5     9.04     485        1983    April 8     12.89    354
1960    April 14    8.67     654        1984    April 14    12.89    33.0
1961    March 27    4.56     60.0       1985    March 20    12.13    243
1962    April 23    7.03     473        1986    March 25    12.35    275
1963    June 12     4.57     210        1987    April 8     13.79    480
1964    June 20     5.38     286        1988    April 6     8.71     38.0
1965    April 14    8.10     580        1989    April 24    9.48     49.0
1966    April 2     7.35     492        1990    April 24    8.82     15.0
1967    May 9       6.28     412        1991    June 19     9.45     35.0
1968    March 27    5.55     160        1992    March 9     10.77    80.0
1969    April 14    7.85     606        1993    July 29     14.11    492
1970    April 29    7.99     567        1994    April 12    14.11    138
1971    April 12    7.75     568        1995    March 21    12.98    341
1972    April 16    5.79     325        1996    April 19    14.21    523
1973    March 24    9.85     118        1997    April 23    16.05    737
1974    April 22    15.61    595

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

1950    April 18    48.70    11,800     1983    April 8     12.89    354
1956    April 19    14.23    1,350      1995    March 21    12.98    341
1979    April 22    16.75    900        1957    March 22    6.12     340
1997    April 23    16.05    737        1972    April 16    5.79     325
1955    April 2     13.23    700        1976    April 9     13.31    313
1960    April 14    8.67     654        1982    April 14    12.95    308
1969    April 14    7.85     606        1964    June 20     5.38     286
1974    April 22    15.61    595        1986    March 25    12.35    275
1965    April 14    8.10     580        1952    April 1     38.48    260
1971    April 12    7.75     568        1985    March 20    12.13    243
1970    April 29    7.99     567        1963    June 12     4.57     210
1996    April 19    14.21    523        1954    June 12     35.53    187
1966    April 2     7.35     492        1980    April 6     11.86    180
1993    July 29     14.11    492        1953    May 31      35.86    178
1959    April 5     9.04     485        1968    March 27    5.55     160
1987    April 8     13.79    480        1994    April 12    14.11    138
1962    April 23    7.03     473        1973    March 24    9.85     118
1978    April 10    14.28    429        1992    March 9     10.77    80.0
1967    May 9       6.28     412        1958    July 5      2.38     78.0
1975    April 25    10.38    76.0       1988    April 6     8.71     38.0
1981    March 25    10.73    76.0       1991    June 19     9.45     35.0
1977    July 18     10.40    64.0       1984    April 14    12.89    33.0
1961    March 27    4.56     60.0       1990    April 24    8.82     15.0
1989    April 24    9.48     49.0

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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
__________________________________________________________________________________________________________________________________

1951  --       --       --       --       --       --         450.9    586.9    40.7   --       --       --       --
1952    3.54     2.81     2.07     1.25     1.00     4.57     46.8     5.90     1.91     1.24     0.542    0.583    5.97
1953    1.25     0.880    0.065    0.506    0.236    2.03     9.84     18.9     15.5     2.41     4.64     1.68     4.84
1954    2.59     2.52     1.24     0.635    1.09     7.06     36.0     18.5     51.7     4.13     3.09     7.32     11.3
1955    5.54     4.68     1.92     1.23     1.60     1.61     167.5    18.1     22.5     34.9     2.01     1.95     21.8

1956    17.4     4.39     3.03     3.40     4.23     3.92     294.2    208.8    32.7     13.9     4.69     11.8     50.1
1957    5.77     15.8     5.90     2.88     1.50     40.1     28.5     21.5     13.2     6.25     7.78     20.6     14.2
1958    6.21     5.53     3.34     2.21     2.38     9.41     15.6     6.38     3.95     11.9     1.12     0.953    5.77
1959    2.70     2.21     1.70     2.10     1.86     5.54     100.0    20.2     7.91     2.65     0.994    2.45     12.4
1960    3.71     3.06     3.37     2.64     2.03     1.85     196.6    38.2     6.22     2.23     1.09     1.00     21.6

1961    1.76     3.14     1.26     1.37     0.829    13.7     9.20     3.93     0.733    0.465    0.477    0.277    3.11
1962    0.513    2.51     2.00     1.28     0.571    0.494    128.9    81.7     66.8     21.3     9.92     7.42     26.9
1963    9.45     12.8     1.51     4.86     5.22     5.16     11.4     9.50     67.4     17.0     8.44     7.34     13.3
1964    6.18     3.82     6.55     2.01     1.43     0.216    83.2     35.6     78.7     17.8     4.38     11.0     20.8
1965    19.0     10.5     5.41     4.46     2.59     5.58     214.6    107.1    36.4     10.6     5.91     9.67     35.9

1966    14.1     8.21     9.74     5.15     3.04     134.9    206.1    143.9    13.3     31.4     8.20     3.52     48.7
1967    7.71     13.2     4.77     3.05     2.88     35.1     159.0    181.2    1.91     2.94     0.871    3.21     34.8
1968    1.14     4.85     10.2     6.12     5.12     19.9     26.3     38.4     15.9     14.3     7.98     5.27     13.0
1969    7.19     9.02     9.03     2.34     3.25     6.34     256.4    37.3     10.8     7.66     1.17     0.561    29.0
1970    0.783    5.40     7.60     6.40     6.37     5.52     215.6    190.8    46.5     6.45     4.25     3.18     41.6

1971    7.75     14.3     12.9     7.27     2.11     1.88     253.1    39.8     46.7     15.2     2.16     1.09     33.5
1972    2.45     12.3     3.53     2.16     3.45     50.9     110.1    22.6     5.36     5.29     2.50     3.02     18.6
1973    5.73     3.88     3.14     3.43     3.80     36.0     13.7     8.53     4.03     3.51     1.28     0.883    7.37
1974    3.07     3.52     4.37     4.29     3.20     11.4     246.9    224.8    27.3     2.77     0.972    0.653    44.5
1975    4.10     9.31     6.75     5.37     4.52     3.67     31.2     27.6     3.17     3.02     3.34     2.67     8.73

1976    1.46     0.560    0.700    3.99     4.56     4.73     141.8    5.45     30.8     1.79     2.00     1.62     16.4
1977    1.22     2.23     1.95     1.72     1.66     7.09     4.03     4.26     4.30     7.67     1.60     2.08     3.33
1978    3.54     8.24     10.3     3.65     9.07     13.7     205.6    30.8     3.48     0.086    0.805    0.206    23.9
1979    2.87     2.29     1.31     1.65     8.35     19.2     249.7    184.1    23.3     18.2     4.06     20.2     44.6
1980    5.19     5.39     4.90     4.74     4.21     7.27     37.1     1.63     0.828    0.741    9.62     28.3     9.09

1981    30.1     22.7     5.08     4.60     18.7     28.8     47.3     19.9     19.6     6.28     6.63     13.6     18.5
1982    11.0     9.38     2.74     1.29     0.834    12.7     97.9     37.6     27.6     14.8     6.04     7.77     19.1
1983  --       --       --       --       --         54.6     111.5    18.6     7.82     3.51     1.56     2.85   --
1984  --       --       --       --       --         2.67     22.1     9.32     7.83     7.86     0.900    3.26   --
1985  --       --       --       --       --         76.9     56.0     13.0     11.0     12.0     28.9     17.9   --

1986  --       --       --       --       --         82.3     124.9    68.0     10.8     22.8     10.9     19.6   --
1987  --       --       --       --       --         39.6     269.7    20.5     7.61     3.28     0.821    1.64   --
1988  --       --       --       --       --         5.27     14.1     6.81     0.473    0.453    0.208    0.244  --
1989  --       --       --       --       --         15.5     14.4     4.96     5.04     0.936    1.54     0.096  --
1990  --       --       --       --       --         1.55     6.27     6.76     6.12     1.95     1.43     1.41   --

1991  --       --       --       --       --         0.734    0.428    10.5     17.4     6.10     6.29     3.69   --
1992  --       --       --       --       --         34.4     21.3     15.6     7.66     8.52     3.45     7.19   --
1993  --       --       --       --       --         20.8     48.0     32.1     23.6     107.3    143.7    25.9   --
1994  --       --       --       --       --         40.2     71.7     12.5     3.13     5.16     9.67     4.39   --
1995  --       --       --       --       --         119.6    153.4    39.2     9.00     17.7     4.72     8.42   --

1996  --       --       --       --       --         33.8     250.7    143.7    27.5     31.0     8.10     7.31   --
1997  --       --       --       --       --         15.7     317.8    293.3    20.7     216.4    10.7     8.36   --



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