05068500 SAND HILL DITCH AT BELTRAMI, MN

List Of Figures:

Annual mean discharge
Annual flow duration

LOCATION.--Lat 47°32'10'', long 96°32'00'', in SE1/4NW1/4 sec.21, T.147 N., R.46 W., near center of
span on downstream side of bridge on U.S. Highway 75, 150 ft upstream from Great Northern Railway
bridge and 0.25 mi south of post office in Beltrami.
DRAINAGE AREA.--Not available.
PERIOD OF RECORD.--March 1943 to September 1958. Winter records incomplete some years.
Monthly discharge only for some periods, published in WSP 1308.
GAGE.--Chain gage. Datum of gage is 883.50 ft above mean sea level, adjustment of 1912 (levels by U.S.
Army Corps of Engineers). Prior to Aug. 26, 1944, reference point and Aug. 26, 1944, to Nov. 21,
1948, chain gage, at same site at datum 12.62 ft higher. Nov. 22, 1948, to Sept. 30, 1956, chain gage at same site at
datum 10.00 ft higher.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 2,460 ft3/s, Apr. 20, 1950, gage height,
20.99 ft, present datum; maximum gage height, 21.59 ft, present datum, Apr. 19,1950, from
floodmark, backwater from ice; no flow at times.

Annual mean discharge

Annual mean discharge for 0568500 Sand Hill Ditch at Beltrami, Minnesota

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                              Statistics of monthly and annual mean discharges
__________________________________________________________________________________________________________

                  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)     (ft/s)    variation   discharge
__________________________________________________________________________________________________________

October      53.4      1946            9.57      1955            21.9        12.3        0.56       3.79
November     41.7      1958            8.43      1956            21.0        9.32        0.44       3.63
December     25.0      1945            5.09      1956            13.1        5.16        0.39       2.27
January      14.0      1947            4.90      1948            8.58        2.94        0.34       1.48
February     14.4      1958            0.790     1948            8.32        4.01        0.48       1.44
March        150       1946            0         1944            37.6        48.8        1.30       6.49
April        493       1947            27.5      1958            196         144         0.74       33.8
May          588       1950            23.4      1958            98.9        136         1.37       17.1
June         222       1947            20.6      1952            76.0        62.0        0.82       13.1
July         178       1950            14.1      1951            51.6        42.8        0.83       8.91
August       113       1944            8.97      1955            25.8        25.2        0.97       4.46
September    52.3      1945            8.49      1954            20.4        16.0        0.79       3.52
Annual       122       1950            22.6      1955            46.2        33.2        0.72       100
__________________________________________________________________________________________________________

Annual flow duration

Annual flow duration for 0568500 Sand Hill Ditch at Beltrami, Minnesota

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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           4.80    0.78    0       12.0    22.5    17.4    12.2    7.10    7.10    8.20    8.80    5.00    5.48
  90           5.00    0.99    0.80    22.5    25.7    20.4    14.7    7.90    8.40    10.2    12.2    7.70    6.71
  85           5.60    4.80    3.80    32.0    27.8    22.2    16.4    9.24    9.10    11.4    13.4    9.00    7.82
  80           6.30    4.80    3.80    45.1    30.4    24.6    18.6    10.2    10.3    12.6    14.3    10.2    8.35
  75           7.00    5.40    6.82    51.2    33.1    27.5    21.7    11.3    11.3    13.3    15.0    10.6    10.2
  70           7.00    6.10    7.31    60.2    36.0    31.6    24.1    12.4    11.9    14.0    16.1    11.0    11.2
  65           7.00    6.80    8.32    73.2    39.3    34.3    26.3    13.6    12.5    15.4    17.2    11.3    12.8
  60           7.40    6.80    10.6    89.3    43.6    37.8    28.7    15.4    13.2    17.6    18.0    11.6    13.8
  55           7.80    7.70    11.2    102     49.6    41.4    32.2    17.1    13.9    18.7    18.5    12.0    14.9
  50           7.80    7.70    11.9    116     55.6    44.9    36.0    19.1    14.8    19.6    19.0    12.5    16.9
  45           7.80    7.70    13.2    136     61.7    48.1    39.3    21.5    15.9    20.5    19.7    13.0    18.9
  40           8.70    7.70    14.8    164     68.2    53.1    42.8    23.4    16.7    22.0    20.3    13.4    21.4
  35           8.70    9.23    16.9    197     75.3    61.3    48.6    25.4    17.5    23.1    20.7    13.9    23.9
  30           10.3    9.88    19.2    225     84.6    69.3    54.0    28.2    18.4    24.2    21.6    14.7    28.4
  25           10.8    10.3    21.6    254     94.7    81.8    58.5    31.2    20.2    25.7    23.6    15.9    34.1
  20           10.3    12.1    24.8    288     109     106     65.4    33.1    24.5    30.2    28.4    17.0    42.3
  15           7.75    13.3    39.2    337     133     135     77.7    34.9    36.5    35.4    33.8    18.4    55.6
  10           5.17    14.2    101     451     178     183     94.5    42.7    46.1    43.8    39.6    23.0    85.7
  5            2.58    14.7    226     657     324     252     155     61.1    62.3    48.3    43.6    25.5    181
______________________________________________________________________________________________________________________

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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         68.8           50.1          51.8          46.2           34.6
  0.95         1.05         124            92.9          87.0          71.0           49.5
  0.90         1.11         168            129           116           90.7           61.7
  0.80         1.25         243            192           164           124            82.9
  0.50         2            478            408           328           235            160
  0.20         5            918            866           673           476            351
  0.10         10           1,280          1,280         992           706            559
  0.04         25           1,800          1,950         1,510         1,100          958
  0.02         50           2,250          2,550         2,000         1,480          1,390
  0.01         100          2,730          3,240         2,570         1,940          1,970
  0.005        200          3,250          4,040         3,250         2,510          2,760
  0.002        500          4,010          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       1.09   1.09  1.11  1.18   1.23   1.71   3.10    5.34    7.62
0.10       10       1.86   1.87  1.92  2.07   2.18   2.76   4.07    6.05    8.18
0.20       5        3.16   3.19  3.31  3.58   3.80   4.42   5.46    7.05    9.02
0.50       2        6.25   6.34  6.59  7.12   7.59   8.17   8.65    9.41    11.3
____________________________________________________________________________________

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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           1.14  1.14   1.20  1.32        0      0      0      0
0.10           10           2.10  2.10   2.17  2.32        0.820  0.825  0.919  1.95
0.20           5            3.80  3.80   3.88  4.06        3.08   3.10   3.41   4.91
0.50           2            8.08  8.08   8.12  8.24        9.30   9.37   10.0   15.6

                                June-July-August           September-October-November
                            _________________________     ___________________________

0.05           20           5.30  5.70   6.16  7.28        5.00   5.34   5.99   7.15
0.10           10           6.50  7.00   7.51  8.94        5.89   6.28   6.95   8.11
0.20           5            8.30  8.97   9.56  11.5        7.23   7.71   8.42   9.60
0.50           2            13.1  14.4   15.3  18.5        10.9   11.8   12.6   14.0
_____________________________________________________________________________________

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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

1943    April 5      --       741            1951    April 9      8.46     823
1944    August 15    --       226            1952    April 12     --       315
1945    April 1      --       344            1953    March 29     --       190
1946    March 25     --       564            1954    April 14     --       278
1947    April 16     7.57     1,220          1955    April 7      10.07    551
1948    April 11     7.20     1,050          1956    April 19     --       480
1949    June 2       --       425            1957    June 28      --       370
1950    April 20     --       2,460          1958    July 5       --       95

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

1950    April 20     --       2,460          1949    June 2       --       425
1947    April 16     7.57     1,220          1957    June 28      --       370
1948    April 11     7.20     1,050          1945    April 1      --       344
1951    April 9      8.46     823            1952    April 12     --       315
1943    April 5      --       741            1954    April 14     --       278
1946    March 25     --       564            1944    August 15    --       226
1955    April 7      10.07    551            1953    March 29     --       190
1956    April 19     --       480            1958    July 5       --       95
_____________________________________________________________________________________

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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
__________________________________________________________________________________________________________________________________

1943    --       --      --       --       --      --         213.0      93.7       208.7     54.5       31.0     16.0      --
1944    21.8     16.4    --       --       --      0          38.5       39.8       46.4      89.6       113.3    61.0      --
1945    42.4     37.6    25.0     --       --      129.2      244.2      126.1      88.1      44.0       30.8     52.3      --
1946    53.4     33.7    --       --       --      150.0      181.5      73.4       44.5      42.8       8.98     12.9      --
1947    27.8     21.0    13.0     14.0     14.0    15.0       492.8      159.2      222.0     47.2       30.0     19.0      89.1

1948    19.0     19.7    14.8     4.90     0.790   2.59       307.7      64.9       30.0      24.6       20.5     12.0      43.1
1949    12.3     16.7    13.4     8.11     8.04    13.1       133.4      43.7       120.7     51.5       27.6     10.9      38.2
1950    17.1     16.8    11.0     7.00     5.00    4.52       470.3      588.1      105.6     178.1      37.7     17.4      122.2
1951    24.9     18.6    --       --       --      --         360.6      110.1      38.6      14.1       11.8     20.6      --
1952    19.9     17.7    --       --       --      --         167.9      42.5       20.6      28.5       14.8     11.7      --

1953    14.9     18.0    11.7     6.69     7.51    57.5       59.4       45.9       58.1      40.9       22.8     14.9      30.0
1954    11.5     13.0    12.0     10.6     10.0    13.5       102.9      49.3       45.4      23.8       9.92     8.49      25.8
1955    9.57     14.5    9.45     8.00     8.43    17.0       118.8      28.8       26.0      14.4       8.97     8.97      22.6
1956    10.5     8.43    5.09     5.21     6.30    7.23       115.7      58.2       47.2      14.6       11.0     9.40      24.8
1957    15.1     21.8    10.5     9.15     8.73    53.7       97.7       34.9       88.2      111.4      22.9     39.5      42.9
1958    29.0     41.7    18.6     12.1     14.4    24.8       27.5       23.4       25.6      45.1       11.0     11.3      23.7
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