05101500 TONGUE RIVER AT CAVALIER, ND

List Of Figures:

Annual mean discharge
Annual flow duration

LOCATION.--Lat 48°47'55'', long 97°37'35'', in SE1/4NE1/4 sec.4, T.161 N., R.54 W., on left abutment of dam 0.5 mi upstream from State Highway 5 in Cavalier.
DRAINAGE AREA.--167 mi2.
PERIOD OF RECORD.--October 1938 to October 1951.
GAGE.--Staff gage and concrete control. Datum of gage is 880.98 ft above mean sea level, datum of 1929, Emerson-Crookston supplementary adjustment of 1941. Prior to July 21, 1946, wire-weight or chain gage at site 0.5 mi downstream at datum 11.74 ft lower.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge (not including bypass flow), 1,340 ft3/s, May 8, 1950, gage height, 4.58 ft; no flow for several months in some years. During the floods of April and May 1950 and probably during flood of April 1948, large amounts of water bypassed the gage and are not included in the records. Maximum discharge including bypass flow, 11,800 ft3/s, Apr. 18, 1950, on basis of contracted-opening measurement of peak flow at site about 5 mi upstream.

Annual mean discharge

Annual mean discharge for 05101500 Tonge River at Cavalier, 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      14.3      1942            0         m            3.62        3.76        1.04       1.42
November     45.3      1945            0         m            5.90        12.0        2.03       2.31
December     10.0      1945            0         m            1.98        2.64        1.33       0.78
January      3.65      1945            0         m            0.970       1.10        1.13       0.38
February     2.83      1945            0         m            0.510       0.81        1.57       0.20
March        184       1945            0         m            30.2        54.4        1.80       11.8
April        273       1948            14.2      1939         117         85.2        0.73       45.9
May          406       1950            2.87      1939         53.7        108         2.00       21.0
June         98.2      1943            1.24      1940         22.8        26.3        1.15       8.92
July         30.9      1943            0.087     1939         8.57        9.41        1.10       3.35
August       20.9      1942            0         1939         4.39        5.82        1.33       1.72
September    23.5      1944            0         1939         5.58        7.41        1.33       2.19
Annual       55.6      1950            1.57      1939         21.3        15.1        0.71       100
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Annual flow duration

Annual flow duration for 0510500 Tongue River at Cavalier, 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       0       0.67    2.00    0.61    0       0       0       0       0.05    0       0
  90           0       0       0       1.90    3.10    1.40    0.20    0       0       0       0.05    0       0
  85           0       0       0       3.50    4.74    2.70    0.39    0       0.10    0       0.05    0       0
  80           0       0       0       11.5    7.15    3.30    0.62    0.10    0.19    0       0.05    0       0.10
  75           0       0       0       16.4    9.43    4.10    0.97    0.36    0.36    0.10    1.30    0.19    0.31
  70           0.10    0       0       21.3    11.3    5.73    1.50    0.69    0.68    1.10    1.60    0.35    0.54
  65           0.10    0       0       26.0    12.7    7.79    1.90    1.10    1.00    1.80    1.60    0.55    0.95
  60           0.28    0.10    0.10    31.4    14.1    8.51    2.40    1.10    1.00    2.40    2.10    0.65    1.30
  55           0.49    0.10    0.17    37.2    15.5    10.4    3.00    1.30    1.30    2.40    2.60    1.00    1.70
  50           0.49    0.19    0.38    42.8    17.3    12.3    4.02    2.00    2.00    2.80    2.60    1.00    2.20
  45           0.69    0.29    0.49    49.7    19.6    14.5    4.53    2.00    2.00    2.80    3.30    1.20    3.00
  40           0.87    0.29    0.49    59.6    25.9    16.4    5.55    3.10    2.40    3.30    3.30    1.90    3.00
  35           1.20    0.29    0.83    74.0    30.7    18.5    7.56    3.10    3.00    3.80    3.30    1.90    4.37
  30           1.50    0.48    0.83    92.1    36.2    21.5    9.73    3.90    3.70    3.80    3.30    2.30    5.70
  25           1.50    0.60    1.10    120     40.7    25.9    11.3    3.90    4.71    4.40    3.30    2.60    8.87
  20           1.70    1.00    1.80    164     47.0    30.8    13.5    5.21    5.56    5.20    4.47    2.60    14.1
  15           1.90    1.20    7.52    216     62.9    36.8    15.0    6.23    6.48    6.56    4.86    3.10    21.0
  10           2.70    1.20    131     354     96.7    48.7    18.6    7.39    11.7    7.72    5.51    3.60    37.7
  5            3.40    2.60    212     574     194     79.8    24.2    15.9    22.5    10.4    7.55    7.13    85.9
_____________________________________________________________________________________________________________________

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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         ng             13.9        12.0          7.39           7.75
  0.95         1.05         ng             58.6        44.1          28.9           21.9
  0.90         1.11         327            110         79.2          53.2           35.8
  0.80         1.25         436            208         146           100            61.1
  0.50         2            720            500         353           251            144
  0.20         5            1,120          813         617           446            275
  0.10         10           1,370          933         742           538            359
  0.04         25           1,680          1,020       848           616            454
  0.02         50           1,900          1,050       900           653            514
  0.01         100          2,110          1,070       935           678            567
  0.005        200          2,300          1,080       958           695            613
  0.002        500          2,550          ng          ng            ng             ng
________________________________________________________________________________________________

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                    Probability of occurrence of annual low discharges
____________________________________________________________________________________

                                     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       0      0     0     0        0        0        0        0        0
0.10       10       0      0     0     0        0        0        0        0        0
0.20       5        0      0     0     0        0        0        0.014    0.229    0.750
0.50       2        0      0     0     0.121    0.145    0.310    0.497    0.699    1.77
__________________________________________________________________________________________

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                   Probability of occurrence of seasonal low discharges
__________________________________________________________________________________________________

                                               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           0       0        0        0            0       0        0         0
0.10           10           0       0        0        0            0       0        0         0
0.20           5            0       0        0        0            0       0        0         0
0.50           2            0.170   0.179    0.183    0.226        0.179   0.183    10.800    1.43

                                 June-July-August                    September-October-November
                            ________________________________       ________________________________

0.05           20           0       0        0        0            0       0        0         0
0.10           10           0       0        0        0.028        0       0        0         0
0.20           5            0       0        0        0.233        0.055   0.090    0.119     0.260
0.50           2            0.659   1.04     1.31     1.65         0.269   0.702    1.28      2.24
___________________________________________________________________________________________________
1Graphical interpretation.

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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

1939    April 1     4.10     35.0       1945    March 27    --       934
1940    April 20    6.77     288        1946    March 22    10.02    700
1941    April 11    12.26    1,080      1948    April 21    4.38     1,300
1942    April 14    --       1,080      1949    April 10    --       990
1943    March 27    --       500        1950    May 8       4.58     1,340
1944    April 12    --       450        1951    April 5     2.60     420

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

1950    May 8       4.58     1,340      1946    March 22    10.02    700
1948    April 21    4.38     1,300      1943    March 27    --       500
1941    April 11    12.26    1,080      1944    April 12    --       450
1942    April 14    --       1,080      1951    April 5     2.60     420
1949    April 10    --       990        1940    April 20    6.77     288
1945    March 27    --       934        1939    April 1     4.10     35.0
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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]
___________________________________________________________________________________________________________________________

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

1939    0        0        0        0        0        0.484    14.2     2.87     1.28    0.087    0        0        1.57
1940    0        0        0        0        0        0        37.8     5.41     1.24    0.261    0.155    0.007    3.70
1941    0        0.007    0        0        0        0        145.5    9.60     17.7    1.40     0.074    16.8     15.7
1942    14.3     5.07     3.02     1.51     0.300    26.4     267.4    59.6     17.8    3.32     20.9     13.2     35.9
1943    2.54     2.79     0.529    0.665    0.325    59.5     85.8     29.6     98.2    30.9     1.70     0.593    26.1

1944    0.845    2.01     1.26     0.535    0        0        65.0     10.9     10.8    7.96     10.1     23.5     11.0
1945    3.64     45.3     10.0     3.65     2.83     184.4    60.3     42.5     30.0    17.1     3.45     4.24     34.2
1946    3.45     3.85     2.45     1.56     1.30     91.2     32.7     11.9     6.15    2.80     0.448    2.40     13.5
1947    3.81     2.79     0.932    0.032    0        0.484    82.2     13.5     35.9    9.11     4.49     2.06     12.9
1948    5.09     4.01     3.03     2.25     0.586    0.868    273.0    64.4     15.3    19.8     7.63     2.05     32.9

1949    3.01     3.07     1.00     0.500    0.100    1.47     175.9    22.5     8.78    2.50     1.30     1.45     18.3
1950    5.13     3.82     1.30     0.348    0.254    0.526    178.1    405.9    45.5    14.2     2.91     3.75     55.6
1951    5.28     3.92     2.28     1.60     1.00     27.0     106.0    19.5     7.65    1.97     3.96     2.54     15.2
___________________________________________________________________________________________________________________________


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