05099100 SNOWFLAKE CREEK NEAR SNOWFLAKE, MB

List Of Figures:

Annual mean discharge
Annual flow duration

LOCATION.--Lat 49°01'17'', long 98°36'13", in SW1/4 sec.10, T.1., R.9 W., first meridian, Hydrologic Unit 09020313, at traffic bridge, 2.5 mi east, and 1.5 mi south of Snowflake, Manitoba.
DRAINAGE AREA.--348 mi2.
PERIOD OF RECORD.--March 1961 to current year.
GAGE.--Water-stage recorder since March 1968 and nonrecording gage prior thereto. Datum of gage is Geodetic Survey of Canada Datum of 1929. Prior to Jan. 1, 1987, recording gage at same site at datum of 1,221.66 ft above Geodetic Survey of Canada Datum of 1929. Prior to Apr. 2, 1964, nonrecording gage at present site and datum. Apr. 2, 1964, to May 10, 1965, nonrecording gage at site 0.5 mi downstream at present datum.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,710 ft3/s, July 12, 1997, gage height, unknown; maximum gage height, 1,232.08, Apr. 24, 1997; no flow at times.

Annual mean discharge

Annual mean discharge 05099100 SNOWFLAKE CREEK NEAR SNOWFLAKE, MB 
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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      70.5      1995            0         m               5.95        16.6        2.80       2.01
November     39.9      1995            0         m               2.57        7.85        3.06       0.87
December     7.67      1995            0         m               0.30        1.29        4.24       0.10
January      1.36      1995            0         m               0.04        0.23        5.29       0.01
February     4.90      1981            0         m               0.15        0.82        5.34       0.05
March        74.6      1995            0         m               7.62        14.5        1.91       2.58
April        668       1995            0.225     1973            123         165         1.34       41.7
May          945       1997            0.061     1988            94.4        182         1.93       32.0
June         123       1974            0         m               22.5        31.9        1.42       7.61
July         529       1997            0         m               22.3        86.4        3.87       7.56
August       139       1997            0         m               10.3        27.8        2.71       3.47
September    99.7      1993            0         m               6.09        17.8        2.92       2.06
Annual       197       1997            0.378     1988            25.3        39.1        1.54       100

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Annual flow duration

Annual flow duration 05099100 SNOWFLAKE CREEK NEAR SNOWFLAKE, MB 
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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       0       0       0       0       0       0       0       0       0
  90           0       0       0       0.28    0.11    0       0       0       0       0       0       0       0
  85           0       0       0       0.60    0.23    0       0       0       0       0       0       0       0
  80           0       0       0       1.30    0.46    0.03    0       0       0       0       0       0       0
  75           0       0       0       2.96    0.66    0.17    0       0       0       0       0       0       0
  70           0       0       0       4.47    1.30    0.61    0       0       0       0       0       0       0
  65           0       0       0       7.37    2.72    1.60    0.04    0       0       0       0       0       0
  60           0       0       0       12.7    5.68    2.20    0.24    0       0       0       0       0       0
  55           0       0       0       17.7    12.9    4.57    0.71    0       0       0       0       0       0
  50           0       0       0       22.5    20.9    8.18    1.40    0.13    0       0.03    0       0       0.04
  45           0       0       0       29.7    29.5    11.6    3.46    0.46    0.05    0.06    0       0       0.13
  40           0       0       0.16    41.8    39.4    14.5    4.97    0.86    0.17    0.08    0.04    0       0.41
  35           0       0       0.37    60.3    51.7    16.8    7.06    1.60    0.40    0.27    0.09    0       1.30
  30           0       0       1.20    87.1    67.2    19.0    9.21    3.30    1.20    0.50    0.20    0       3.35
  25           0       0       2.20    148     87.1    22.8    12.2    4.86    2.20    1.20    0.34    0       6.34
  20           0       0       4.64    211     120     28.4    15.5    6.85    4.30    3.14    1.00    0       12.5
  15           0       0       7.85    287     184     40.2    20.9    9.62    7.25    4.71    2.30    0.04    23.0
  10           0       0       13.8    399     288     63.7    30.0    21.2    15.6    14.5    4.44    0.16    46.3
  5            0.07    0.04    47.2    577     452     100     47.9    71.7    36.7    33.8    13.9    1.40    113

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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         4.40            3.22        2.21          1.50           0.937
  0.95         1.05         14.5            9.95        7.07          5.00           3.32
  0.90         1.11         26.6            17.9        13.0          9.40           6.41
  0.80         1.25         53.4            35.7        26.7          19.9           14.1
  0.50         2            186             128         102           81.3           60.9
  0.20         5            575             432         372           318            251
  0.10         10           992             795         716           636            516
  0.04         25           1,720           1,500       11,340        11,170         1924
  0.02         50           2,400           2,230       11,980        11,720         11,360
  0.01         100          3,220           3,180       12,830        12,460         11,940
  0.005        200          4,160           14,100      13,890        13,380         12,670
  0.002        500          5,620           ng          ng            ng             ng

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1Statistical 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
                                 [--, 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

1961    March 27   1,224.21    13.6       1980    April 5    1,225.71    67.0
1962    April 18   1,226.41    101        1981    May 22     1,225.67    82.0
1963    March 21   1,226.39    9.90       1982    June 6     1,228.38    505
1964    April 9    1,224.18    21.7       1983    April 6    1,225.87    56.0
1965    April 11   1,225.12    44.0       1984    March 26   1,224.75    14.9
1966    April 14   1,226.36    227        1985    April 8    1,226.68    190
1967    April 20   1,226.54    310        1986    June 3     1,228.07    427
1968    August 25  1,224.01    79.4       1987    April 5    1,228.77    438
1969    April 11   1,227.39    653        1988    April 3    1,225.34    29.0
1970    April 25   1,226.27    279        1989    April 14   1,226.64    185
1971    April 12   --          658        1990    April 3    1,226.57    155
1972    April 16   --          402        1991    July 12    1,226.63    188
1973    March 18   --          21.2       1992    April 8    1,228.86    600
1974    May 21     1,227.64    823        1993    July 28    1,226.69    155
1975    April 28   1,224.64    158        1994    April 15   1,227.84    378
1976    April 8    --          344        1995    April 14   1,229.87    1,210
1977    May 19     1,225.43    29.0       1996    April 25   1,230.59    1,080
1978    April 27   1,226.31    247        1997    July 12    --          2,710
1979    April 21   1,229.94    1,130

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

1997    July 12    --          2,710      1991    July 12    1,226.63    188
1995    April 14   1,229.87    1,210      1989    April 14   1,226.64    185
1979    April 21   1,229.94    1,130      1975    April 28   1,224.64    158
1996    April 25   1,230.59    1,080      1990    April 3    1,226.57    155
1974    May 21     1,227.64    823        1993    July 28    1,226.69    155
1971    April 12   --          658        1962    April 18   1,226.41    101
1969    April 11   1,227.39    653        1981    May 22     1,225.67    82.0
1992    April 8    1,228.86    600        1968    August 25  1,224.01    79.4
1982    June 6     1,228.38    505        1980    April 5    1,225.71    67.0
1987    April 5    1,228.77    438        1983    April 6    1,225.87    56.0
1986    June 3     1,228.07    427        1965    April 11   1,225.12    44.0
1972    April 16   --          402        1977    May 19     1,225.43    29.0
1994    April 15   1,227.84    378        1988    April 3    1,225.34    29.0
1976    April 8    --          344        1964    April 9    1,224.18    21.7
1967    April 20   1,226.54    310        1973    March 18   --          21.2
1970    April 25   1,226.27    279        1984    March 26   1,224.75    14.9
1978    April 27   1,226.31    247        1961    March 27   1,224.21    13.6
1966    April 14   1,226.36    227        1963    March 21   1,226.39    9.90
1985    April 8    1,226.68    190

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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
__________________________________________________________________________________________________________________________________

1961  --       --       --       --       --         2.04     2.65     0.955    0.400    0        0        0      --
1962    0        0        0        0        0        0        16.4     0.887    0        0        0        0        1.43
1963    0        0        0        0        0        2.36     0.677    0.603    3.01     0.594    0.035    0        0.608
1964    0        0        0        0        0        1.81     6.63     0.297    0.167    0.023    0        0        0.737
1965    0        0        0        0        0        0.284    12.6     2.95     2.80     0.826    0.074    1.73     1.76

1966    3.03     1.39     0        0        0        22.0     122.7    57.5     14.8     8.27     3.89     1.25     19.6
1967    0.345    0.067    0        0        0        6.32     46.4     97.7     24.9     9.50     2.07     1.46     15.8
1968    12.3     3.52     0.023    0        0        4.93     14.1     3.93     0.257    4.37     10.9     6.04     5.05
1969    0.737    0.078    0        0        0        0        266.9    103.7    22.1     12.1     4.14     0.183    34.0
1970    0.010    0        0        0        0        0        73.6     155.2    79.0     34.9     11.0     8.22     30.3

1971    2.37     0.859    0        0        0        0        295.6    139.4    22.5     25.8     5.86     2.97     41.2
1972    2.52     0.461    0.085    0        0        16.8     126.7    52.0     5.55     0.226    0        0        16.9
1973    0        0        0        0        0        5.25     0.225    0.081    0        0        0        0        0.471
1974    0        0        0        0        0        0        233.1    382.9    123.0    22.8     9.67     6.84     65.1
1975    4.78     3.17     0.442    0.008    0        4.15     26.0     36.5     11.8     0.981    0.086    0.166    7.37

1976    0.229    0.047    0        0        0        0.597    200.5    61.6     18.2     10.2     6.63     1.60     24.8
1977    0.039    0        0        0        0        0.281    2.62     1.65     0.273    0.001    0        0.096    0.413
1978    0.008    0        0        0        0        0.474    99.8     43.5     2.25     0.688    0.394    0.007    12.2
1979    0        0        0        0        0        0        222.1    390.5    59.7     18.8     1.75     2.50     58.3
1980    0.067    0.083    0.014    0        0        0.161    12.8     2.03     0.051    0        0.001    0.201    1.27

1981    2.61     5.24     0.308    0        4.90     5.92     21.1     10.7     4.07     0.573    0.112    0.023    4.59
1982    0.074    0.037    0        0        0        5.93     61.9     23.2     67.6     4.35     0.280    0        13.5
1983    0.205    0.152    0.746    0        0.005    7.36     23.6     7.41     0.341    5.16     2.22     0.011    3.94
1984    0.055    0.058    0.002    0        0.021    3.88     2.99     2.00     0.059    0        0        0        0.759
1985    0        0        0        0        0        22.1     56.5     3.94     4.23     2.22     0.112    0        7.40

1986    0.389    0.086    0        0        0        20.4     54.2     40.4     41.8     6.55     0.228    0        13.7
1987    0        0        0        0        0        0.016    251.6    48.9     7.99     0.077    1.63     0.072    25.6
1988    0.020    0.007    0        0        0.082    1.45     2.95     0.061    0        0        0        0        0.378
1989    0        0        0        0        0        0        24.4     1.03     0.010    0        0        0        2.09
1990    0        0        0        0        0.010    1.50     14.2     0.366    16.9     2.15     0.032    0.001    2.90

1991    0        0        0        0        0        5.86     4.57     1.30     5.85     14.0     0.528    0        2.70
1992    2.08     1.02     0        0.041    0        42.5     353.3    77.3     13.7     4.92     0.823    0.029    41.0
1993    0        0.254    0        0        0        0.309    41.2     29.2     15.0     35.7     70.4     99.7     24.4
1994    68.6     25.7     1.51     0.078    0        19.5     219.9    79.7     17.9     6.28     5.72     12.8     38.1
1995    70.5     39.9     7.67     1.36     0.488    74.6     668.4    315.7    86.3     33.2     20.8     35.3     112.7


1996    12.7     0.965    0.045    0        0        2.85     390.3    372.3    62.5     31.5     81.5     34.0     82.4
1997    30.4     9.34     0.133    0.054    0.004    0.035    586.8    945.0    96.2     529.4    138.9    10.1     197.3

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