05050000 BOIS DE SIOUX RIVER NEAR WHITE ROCK, SD


List Of Figures:

Annual mean discharge
Annual flow duration


LOCATION.--Lat 4551'45'', long 9634'25", in SW1/4SW1/4 sec.27, T.128 N., R.47 W., Roberts County, Hydrologic Unit 09020101, on Sisseton Indian Reservation, on left bank just downstream from Big Slough Outlet, 300 ft downstream from White Rock Dam, 4 mi south of White Rock, SD, and 5 mi northwest of Wheaton, MN.
DRAINAGE AREA.--1,160 mi2, approximately.
PERIOD OF RECORD.--October 1941 to current year.
GAGE.--Water-stage recorder. Datum of gage is 960.00 ft above sea level, adjustment of 1912 (levels by U.S. Army Corps of Engineers). Prior to Jan. 14, 1943, nonrecording gage at same site at datum 0.11 ft lower. Jan. 15, 1943, to Sept. 30, 1963, water-stage recorder at same site at datum 0.11 ft lower.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 8,750 ft3/s, Apr. 20, 1997, gage height, 16.90 ft; no flow at times in most years.

Annual mean discharge

Annual mean streamflow for 05050000 Bois de Sioux River near White Rock, South 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      535       1994            0         m               30.5        92.2        3.02       2.46
November     307       1996            0         m               16.9        54.4        3.23       1.36
December     57.5      1985            0         m               5.40        11.4        2.11       0.43
January      42.4      1997            0         m               3.45        8.30        2.41       0.28
February     148       1997            0         m               6.18        21.2        3.43       0.50
March        628       1996            0         m               48.0        105         2.19       3.86
April        3,810     1997            0         1942            310         577         1.86       25.0
May          1,440     1997            0.228     1977            307         414         1.35       24.7
June         1,100     1986            0.010     1977            249         305         1.23       20.0
July         1,040     1962            0         m               161         247         1.54       12.9
August       1,180     1993            0         m               71.2        219         3.08       5.73
September    1,060     1993            0         m               35.2        148         4.19       2.83
Annual       536       1997            0.377     1977            104         119         1.14       100

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Annual flow duration

Annual flow duration for 05050000 Bois de Sioux River near White Rock, South Dakota
----------------------------------------------------------------------------------------------------------------------
                              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       0.45     0.58     0        0       0       0       0       0       0       0
  90           0       0       0       1.50     1.20     0.35     0       0       0       0       0       0       0
  85           0       0       0       2.74     1.80     0.72     0.09    0       0       0       0       0       0
  80           0       0       0       3.64     3.16     1.50     0.25    0       0       0       0       0       0
  75           0       0       0       5.38     4.37     3.27     0.52    0.09    0.06    0.03    0       0       0
  70           0       0       0.08    7.95     6.98     5.12     1.10    0.18    0.12    0.08    0.11    0       0.18
  65           0       0       0.32    11.8     10.8     8.00     3.18    0.26    0.17    0.16    0.21    0       0.40
  60           0       0       0.90    17.6     16.2     13.2     4.94    0.78    0.34    0.23    0.41    0       0.61
  55           0       0       1.80    25.5     32.9     25.8     7.09    1.60    0.48    0.32    0.57    0.10    1.40
  50           0       0       3.09    37.7     61.2     48.8     10.6    3.38    0.69    0.65    0.80    0.18    2.66
  45           0       0       4.41    63.0     106      73.1     20.2    4.85    0.98    0.92    1.10    0.43    3.89
  40           0.04    0       7.73    102      161      127      33.0    6.51    2.00    1.30    1.60    0.57    6.08
  35           0.41    0.16    11.6    168      253      199      69.0    8.75    3.09    1.90    2.20    1.40    9.03
  30           0.69    0.55    16.2    239      364      324      117     15.4    4.42    3.21    4.52    1.80    15.6
  25           2.00    1.40    24.0    340      529      443      197     21.8    6.42    4.38    6.02    4.42    29.5
  20           4.55    6.46    39.7    542      716      559      295     38.7    9.57    7.17    7.81    5.22    64.7
  15           6.01    8.18    67.2    728      875      690      453     83.6    18.0    20.1    11.4    8.67    141
  10           11.2    13.0    124     930      1,050    846      632     138     49.0    72.2    26.0    16.3    342
  5            20.9    26.2    312     1,230    1,250    1,060    857     304     137     202     85.8    30.5    758

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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         18.1           4.62          3.10          1.98           1.21
  0.95         1.05         52.5           21.3          16.1          11.6           7.68
  0.90         1.11         89.7           44.6          35.6          27.0           18.7
  0.80         1.25         166            102           86.3          69.3           50.4
  0.50         2            490            404           374           328            259
  0.20         5            1,280          1,250         1,230         1,140          970
  0.10         10           2,030          12,030        11,970        11,770         11,470
  0.04         25           3,200          13,200        13,100        12,790         12,320
  0.02         50           4,220          14,220        14,090        13,680         13,050
  0.01         100          5,350          5,290         15,130        14,620         13,830
  0.005        200          6,580          6,350         16,160        15,540         14,600
  0.002        500          8,350          ng            ng            ng             ng

------------------------------------------------------------------------------------------------------------
1 Statistical adjustment based on correlation between 3-, 7-, 15-, and 30-consecutive-day periods.
-------------------------------------------------------------------------------------
           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

1942    July 11       --         845        1970    October 14      4.68     102
1943    May 24          8.95     1,120      1971    June 26         5.93     188
1944    June 23         9.28     1,080      1972    April 10        9.39     776
1945    April 4         8.10     900        1973    March 27        7.00     381
1946    April 8         7.89     850        1974    May 1           4.22     54.0
1947    May 1           8.67     975        1975    July 16         8.95     552
1948    April 27        8.20     1,020      1976    March 21        8.60     522
1949    July 14       --         210        1977    March 13        5.52     27.0
1950    July 8          9.16     1,060      1978    April 19        11.59    929
1951    May 16        --         959        1979    May 4           10.15    1,030
1952    June 3          10.36    1,410      1980    June 14         6.19     169
1953    May 27        --         187        1981    July 19         4.16     27.0
1954    September 17    4.67     124        1982    April 16        8.25     414
1955    July 11         6.01     152        1983    November 29     6.63     150
1956    August 8        6.94     303        1984    April 14        11.00    978
1957    June 22         9.09     610        1985    March 31        9.19     860
1958    April 16        7.05     418        1986    May 7           12.12    1,820
1959    July 5        --         43.0       1987    October 9       7.71     530
1960    June 11         7.31     131        1988    April 12        5.84     180
1961    September 14    5.16     125        1989    April 14        10.72    693
1962    August 6        11.52    1,620      1990    March 13        4.85     89.0
1963    June 18         8.65     945        1991    July 7          11.14    685
1964    April 22        5.44     209        1992    August 1        7.17     139
1965    June 9          11.05    1,320      1993    August 4        11.52    1,300
1966    April 29        8.77     921        1994    April 8         11.88    1,550
1967    April 17        7.33     530        1995    April 5         11.85    1,690
1968    April 23        3.94     58.0       1996    May 18          10.07    1,230
1969    April1          15.07    3,770      1997    April 20        16.90    8,750

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

1997    April 20        16.90    8,750      1984    April 14        11.00    978
1969    April1          15.07    3,770      1947    May 1           8.67     975
1986    May 7           12.12    1,820      1951    May 16        --         959
1995    April 5         11.85    1,690      1963    June 18         8.65     945
1962    August 6        11.52    1,620      1978    April 19        11.59    929
1994    April 8         11.88    1,550      1966    April 29        8.77     921
1952    June 3          10.36    1,410      1945    April 4         8.10     900
1965    June 9          11.05    1,320      1985    March 31        9.19     860
1993    August 4        11.52    1,300      1946    April 8         7.89     850
1996    May 18          10.07    1,230      1942    July 11       --         845
1943    May 24          8.95     1,120      1972    April 10        9.39     776
1944    June 23         9.28     1,080      1989    April 14        10.72    693
1950    July 8          9.16     1,060      1991    July 7          11.14    685
1979    May 4           10.15    1,030      1957    June 22         9.09     610
1948    April 27        8.20     1,020      1975    July 16         8.95     552
1967    April 17        7.33     530        1955    July 11         6.01     152
1986    October 9       7.71     530        1982    November 29     6.63     150
1976    March 21        8.60     522        1992    August 1        7.17     139
1958    April 16        7.05     418        1960    June 11         7.31     131
1982    April 16        8.25     414        1961    September 14    5.16     125
1973    March 27        7.00     381        1954    September 17    4.67     124
1956    August 8        6.94     303        1969    October 14      4.68     102
1949    July 14       --         210        1990    March 13        4.85     89.0
1964    April 22        5.44     209        1968    April 23        3.94     58.0
1971    June 26         5.93     188        1974    May 1           4.22     54.0
1953    May 27        --         187        1959    July 5        --         43.0
1988    April 12        5.84     180        1977    March 13        5.52     27.0
1980    June 14         6.19     169        1981    July 19         4.16     27.0

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1 Day of month unknown.
---------------------------------------------------------------------------------------------------------------------------------
                             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
__________________________________________________________________________________________________________________________________

 1942    0        0        0        0        0        0        0        2.52     147.9    623.3    197.7    243.8        102.1
 1943    45.7     0.150    0        0        0        5.97     325.3    935.3    680.7    324.3    35.9     6.85         197.7
 1944    7.56     11.0     1.38     0        0        3.66     157.0    252.8    598.1    225.0    15.8     4.80         106.1
 1945    2.82     1.26     0.097    0        0        15.9     375.2    41.4     214.0    5.87     3.21     1.15         54.5
 1946    3.11     1.13     0.274    0        0        28.1     530.5    24.7     13.1     38.7     4.17     2.32         53.4

 1947    3.12     10.5     4.44     1.70     0.811    6.16     271.5    592.1    433.4    453.5    9.04     5.98         150.2
 1948    6.76     8.36     1.84     0.006    0        36.9     358.7    750.2    84.5     15.4     18.2     15.0         108.5
 1949    0.623    0.700    0.219    0        0        19.7     8.26     2.02     2.84     64.9     4.53     1.51         8.91
 1950    1.15     1.41     0.016    0        0        4.60     23.1     17.8     575.1    713.0    327.8    19.4         141.3
 1951    4.87     20.5     20.0     6.38     1.02     3.88     185.9    820.4    330.7    69.6     29.5     4.94         125.7

 1952    4.49     13.0     22.9     20.5     12.7     55.0     259.9    1,002    944.3    260.3    7.52     0.357        217.1
 1953    0.426    0.477    0.068    0        0        28.9     9.86     74.0     57.9     60.2     33.4     15.6         23.6
 1954    1.85     1.19     0        0        0        2.89     5.56     4.66     6.75     2.00     1.33     2.36         2.38
 1955    1.31     0.847    0.084    0        0        4.12     5.91     1.66     2.81     18.1     3.69     0.720        3.30
 1956    0.406    0.040    0        0        0        0.013    13.1     3.29     1.35     0.310    5.85     0.283        2.05

 1957    0.161    0.697    0.129    0        0        1.20     24.3     235.1    324.4    134.4    14.8     24.8         63.5
 1958    33.8     39.0     4.32     13.6     10.8     41.9     223.0    41.5     7.74     6.51     0.206    0.790        35.1
 1959    0.123    0        0        0        0        1.50     0.603    1.45     4.36     3.75     0.087    0.003        0.994
 1960    0.016    0        0        0        0        1.87     19.1     72.8     68.5     19.6     0.132    0            15.2
 1961    0.042    0        0        0        0        1.40     5.37     6.38     .837     0        0.045    1.86         1.33

 1962    0        0        0        0        0        0.142    127.5    412.5    788.3    1,035    1,130    259.9        315.5
 1963    45.7     7.69     5.48     3.52     8.16     17.6     104.5    42.3     558.4    75.3     8.38     3.73         72.9
 1964    1.46     1.15     0.761    0.455    0.217    0.252    107.9    95.1     20.9     5.73     0.397    1.30         19.6
 1965    1.17     0.977    0.468    0        0        0        427.2    433.3    1,088    308.6    9.30     5.26         188.9
 1966    59.8     84.2     28.9     20.1     53.0     58.8     332.0    729.2    431.0    8.30     6.64     1.15         151.2

 1967    23.8     4.02     0        0        0        13.7     223.8    104.8    26.2     199.9    0.765    0.447        50.0
 1968    0.342    0.030    0        0        0        0.016    7.61     7.59     3.55     0.694    0.058    0.043        1.66
 1969    0.452    0.760    0.403    0.058    0        0        1,322    1,310    374.2    20.6     0.232    0            252.6
 1970    1.82     0.310    0        0        0        1.56     14.4     4.30     5.27     0.039    0        0            2.30
 1971    0        0.147    0.087    0        0        2.40     4.80     4.80     69.3     23.6     4.40     5.42         9.55

 1972    0.448    2.50     1.74     1.58     0.266    100.0    630.9    250.6    303.8    25.5     105.5    18.1         119.4
 1973    0.064    0.597    0.678    4.02     8.15     139.2    77.8     17.7     9.37     0.039    0.279    0.047        21.6
 1974    0.016    0.001    0        0        0        8.86     8.11     9.56     3.77     0.123    0.349    0.150        2.59
 1975    0.015    0.001    0        0        0        0        26.5     183.7    87.1     315.6    12.0     23.4         54.7
 1976    1.49     0.256    0.078    0        21.5     221.2    133.8    4.21     0.018    0        0        0.227        31.9


 1977    0        0        0        0        0        2.89     1.24     0.228    0.010    0.016    0.009    0.087        0.377
 1978    0.212    1.02     0.011    0        0        3.88     623.4    718.8    520.0    415.6    108.2    18.4         201.5
 1979    3.34     1.93     1.92     0.640    0.004    0.920    228.2    937.9    695.5    325.9    103.2    8.08         193.4
 1980    7.20     7.28     9.09     9.35     11.9     40.7     23.3     25.5     62.2     12.8     1.83     1.47         17.7
 1981    1.24     0.327    0.110    0        0.166    0.389    1.99     1.46     10.3     8.08     0.096    0.001        2.01

 1982    0        0        0        0        0        3.89     200.5    99.5     3.57     5.43     0.188    0.024        26.0
 1983    0.210    5.64     23.2     2.03     0        2.61     2.54     1.93     0.357    0.070    0        0            3.25
 1984    0        0.002    0        0        1.94     6.19     716.9    311.8    426.2    281.2    103.8    0.718        153.5
 1985    101.3    258.0    57.5     0.200    0.199    227.2    340.0    205.1    420.9    79.7     18.6     19.4         143.9
 1986    8.43     5.17     3.66     4.54     6.84     55.3     720.6    1,092    1,103    722.8    151.1    61.9         329.0

 1987    362.5    85.5     44.6     36.0     24.5     32.4     64.1     28.2     2.54     1.22     0.271    0.105        57.3
 1988    22.4     8.57     4.57     0.310    0.009    9.70     41.7     4.82     0.452    0        0.005    0            7.70
 1989    0.053    0.118    0        0        0        1.34     414.1    491.3    89.7     5.13     6.69     71.6         90.2
 1990    10.1     11.5     6.57     0        0        21.9     6.98     11.0     8.24     2.12     0.075    1.06         6.68
 1991    1.63     1.65     0.594    0.414    0.476    5.11     10.4     14.5     108.3    505.4    71.8     38.4         64.0

 1992    58.5     0.830    0.781    0.650    1.38     8.93     10.4     2.93     6.64     22.4     92.4     0.239        17.4
 1993    0.080    3.80     4.68     4.82     4.19     75.5     602.7    244.4    240.4    711.4    1,182    1,062        346.0
 1994    534.6    20.9     6.57     6.61     7.25     199.0    1,088    1,105    489.7    689.0    139.5    7.22         360.2
 1995    70.0     6.94     5.55     4.62     5.74     208.5    1,277    1,236    667.3    100.6    6.52     7.64         300.0
 1996    271.8    307.3    25.3     8.67     16.3     628.4    841.6    723.2    187.4    5.81     4.17     0.475        252.1
 1997    1.91     4.90     13.2     42.4     148.3    326.0    3,814    1,445    611.9    53.1     5.51     0.996        535.9

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