05060100 MAPLE RIVER BELOW MAPLETON, ND


List Of Figures:

Annual mean discharge
Annual flow duration


LOCATION.--Lat 4654'19'', long 9703'08'', in NW1/4 NW1/4 NW1/4 sec.31, T.140 N., R.50 W., Cass County, Hydrologic Unit 09020204, on left bank just downstream from bridge on county highway and 1.0 mi north of Mapleton.
DRAINAGE AREA.--1,480 mi2, approximately, of which 70 mi2 is probably noncontributing.
PERIOD OF RECORD.--April 1944 to September 1975, March 1995 to current year. April 1944 to September 1958 published as "at Mapleton". Record not equivalent at extreme high flows to station 05060000 (site 9 mi upstream), which was operated for water years 1959 to 1975.
GAGE.--Water-stage recorder. Datum of gage is 890.00 ft above sea level. Feb. 16, 1944, to Sept. 30, 1958, nonrecording gage at site 2 mi upstream at datum 3.33 ft lower.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,150 ft3/s, Apr. 16, 1997, gage height, 23.76 ft; maximum gage height, 24.96 ft, Apr. 8, 1997, backwater from ice; no flow at times.

Annual mean discharge

Annual mean discharge 05060100 MAPLE RIVER BELOW MAPLETON, ND
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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      51.1      1996            0         1953            6.34        12.5       1.98       0.67
November     19.4      1958            1.75      1953            7.44        5.71       0.77       0.78
December     7.33      1958            0.632     1956            3.57        2.53       0.71       0.38
January      3.21      1996            0.016     1956            1.18        1.09       0.92       0.12
February     3.57      1954            0         m               0.56        0.93       1.67       0.06
March        952       1995            0         1956            116         246        2.12       12.2
April        2,960     1997            21.0      1953            522         738        1.41       54.9
May          620       1950            6.30      1955            128         201        1.57       13.5
June         716       1953            6.52      1954            91.4        178        1.94       9.63
July         280       1997            2.90      1956            50.5        77.4       1.53       5.32
August       51.1      1953            0.042     1946            11.8        15.6       1.32       1.24
September    51.6      1995            0         1949            10.8        16.3       1.50       1.14
Annual       340       1997            11.1      1954            74.9        91.6       1.22       100

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Annual flow duration

Annual flow duration 05060100 MAPLE RIVER BELOW MAPLETON, ND
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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       16.8     5.84    3.70    1.20    0       0       0       0.10    0.10    0
  90           0       0       0       20.1     7.12    5.16    2.10    0.10    0       0       1.40    0.38    0
  85           0       0       0       24.3     9.38    6.17    4.22    0.27    0       0       2.00    0.74    0.10
  80           0.10    0       0       29.8     12.2    6.80    5.29    0.45    0.10    0.10    2.40    1.00    0.27
  75           0.10    0       0       36.0     14.4    7.87    6.60    0.74    0.19    0.18    2.90    1.00    0.53
  70           0.10    0       0.10    43.8     16.4    9.75    8.38    1.20    0.19    0.27    3.40    1.20    1.00
  65           0.30    0       0.10    54.2     18.3    11.6    9.47    2.00    0.37    0.50    4.10    1.50    2.00
  60           0.48    0.10    0.18    66.1     20.5    13.6    11.3    2.60    0.70    0.61    4.10    1.70    2.84
  55           0.79    0.20    0.46    82.0     22.7    15.5    13.2    3.91    1.10    1.10    4.90    2.40    3.93
  50           1.00    0.20    0.84    109      26.7    17.6    14.7    4.61    2.10    2.00    5.90    2.80    4.58
  45           1.00    0.20    3.56    137      31.2    20.0    16.4    5.06    3.20    3.00    6.21    2.80    6.12
  40           1.10    0.20    4.63    178      36.6    23.8    18.7    5.81    4.00    3.70    6.51    3.40    7.86
  35           1.50    0.37    11.7    240      45.9    29.3    21.2    6.49    4.99    4.51    6.92    4.00    10.5
  30           1.80    0.47    20.3    353      60.8    36.7    27.5    9.78    6.75    5.29    7.51    4.00    14.6
  25           1.80    0.47    28.6    529      96.4    47.5    35.6    12.4    13.8    6.00    8.70    4.70    19.5
  20           1.80    0.59    41.4    690      165     66.7    60.3    15.5    19.5    7.11    11.9    5.63    26.6
  15           2.30    1.20    90.9    1,040    221     86.0    89.0    21.5    24.3    9.17    14.4    6.74    41.5
  10           3.00    1.20    240     1,640    388     130     148     28.0    33.9    13.6    17.8    8.06    82.7
  5            3.40    2.50    866     2,730    677     262     240     40.1    54.0    35.4    23.0    9.27    260

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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         56.4           152.0       45.4          28.3           22.6
  0.95         1.05         138            1129        100           63.1           45.0
  0.90         1.11         219            1210        154           97.7           66.3
  0.80         1.25         380            356         262           167            108
  0.50         2            1,060          934         732           483            292
  0.20         5            2,810          2,520       2,100         1,450          857
  0.10         10           4,600          4,270       3,690         2,610          1,550
  0.04         25           7,690          7,570       6,770         4,950          3,010
  0.02         50           10,600         110,400     19,700        7,540          4,670
  0.01         100          14,200         114,000     113,500       11,100         7,010
  0.005        200          18,400         118,100     117,700       15,700         10,200
  0.002        500          25,100         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
_____________________________________________________________________________________

                     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

Annual peak discharge, by year, and corresponding gage height
1944    April 8     8.16     177        1953    June 17     18.62    4,840
1945    April 12    8.59     373        1954    March 21    8.62     200
1946    March 21    13.15    550        1955    April 2     12.40    500
1947    April 14    18.04    3,880      1956    April 14    11.51    630
1948    April 7     17.28    1,500      1957    June 23     8.52     430
1949    April 3     14.75    850        1958    April 10    7.57     195
1950    April 2     17.73    1,980      1995    March 30    20.33    2,360
1951    April 7     12.50    750        1996    April 16    21.68    3,460
1952    April 6     18.90    3,850      1997    April 16    23.76    7,150

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

1997    April 16    23.76    7,150      1951    April 7     12.50    750
1953    June 17     18.62    4,840      1956    April 14    11.51    630
1947    April 14    18.04    3,880      1946    March 21    13.15    551
1952    April 6     18.90    3,850      1955    April 2     12.40    500
1996    April 16    21.68    3,460      1957    June 23     8.52     430
1995    March 30    20.33    2,360      1945    April 12    8.59     373
1950    April 2     17.73    1,980      1954    March 21    8.62     200
1948    April 7     17.28    1,500      1958    April 10    7.57     195
1949    April 3     14.75    850        1944    April 8     8.16     177

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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
__________________________________________________________________________________________________________________________________

1944  --       --      --       --       --       --         59.1     56.3     23.2     12.9     12.9     9.95     --
1945    5.06     14.5    4.84     0.329    0        93.2     86.4     25.2     16.5     3.60     3.37     0.467    21.2
1946    1.32     2.35    0.794    0.100    0.032    115.8    69.8     8.82     9.37     4.41     0.042    0.127    17.9
1947    5.96     5.48    1.28     0.129    0        100.7    945.6    59.3     353.2    17.9     1.02     4.04     123.4
1948    2.38     6.48    5.61     2.58     0.324    6.33     517.5    51.3     19.5     13.8     9.14     1.55     52.4

1949    0.694    6.20    1.75     0.042    0        8.96     209.1    15.4     8.07     7.26     0.229    0        21.3
1950    0.474    2.73    1.00     0.042    0        86.1     926.7    619.6    76.7     65.2     6.46     2.46     149.0
1951    4.29     3.55    1.36     0.710    0.200    7.37     234.1    16.1     11.6     11.4     6.02     10.8     25.4
1952    4.61     6.10    6.32     1.45     0.355    0.242    905.9    25.7     6.67     48.7     0.552    0.007    82.7
1953    0        1.75    1.99     1.42     1.47     25.0     21.0     88.5     716.5    63.4     51.1     1.78     80.7

1954    0.797    5.90    5.17     2.48     3.57     38.4     37.1     14.1     6.52     12.9     2.56     3.15     11.1
1955    0.787    3.37    3.05     1.48     0.250    0.184    117.9    6.30     13.4     63.2     9.47     0.280    18.3
1956    0.619    1.99    0.632    0.016    0        0        114.1    27.3     13.6     2.90     0.487    0.243    13.4
1957    0.019    7.42    1.89     0.497    0.150    7.10     27.1     13.5     54.3     13.8     15.2     25.5     13.8
1958    10.3     19.4    7.33     2.35     0.586    31.8     74.8     16.9     15.7     42.4     3.09     5.11     19.2

1995  --       --      --       --       --         951.5    692.9    300.5    46.2     226.1    47.7     51.6     --
1996    51.1     15.1    6.97     3.21     1.37     501.8    1,398    362.5    88.9     18.7     13.2     39.0     207.5
1997    13.1     16.7    7.11     2.09     0.579    3.07     2,956    597.6    166.2    280.2    29.7     38.6     340.4

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