05075700 MUN RIVER NEAR GRYGLA, MN

List Of Figures:

Annual mean discharge
Annual flow duration

LOCATION.--Lat 48°19'31'', long 95°44'35'', in NE1/4NE1/4 sec.23, T.156 N., R.40 W., Marshall County, Hydrologic Unit 09020304, at bridge on State Highway 89 and 6 mi west of Grygla.
DRAINAGE AREA.--150 mi2.
PERIOD OF RECORD.--Water year 1979 to current year.
GAGE.--Crest-stage gage.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,950 ft3/s, Apr. 19, 1996, gage height, 18.57 ft; maximum gage height, 19.00 ft, Apr. 16, 1997, backwater from ice.

Annual mean discharge

Annual mean discharge 05075700 MUN RIVER NEAR GRYGLA, MN 
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                              Statistics of monthly and annual mean discharges
                                           [--, no data]
__________________________________________________________________________________________________________

                  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    --          --            --          --            --          --          --         --
November   --          --            --          --            --          --          --         --
December   --          --            --          --            --          --          --         --
January    --          --            --          --            --          --          --         --
February   --          --            --          --            --          --          --         --
March      --          --            --          --            --          --          --         --
April      --          --            --          --            --          --          --         --
May        --          --            --          --            --          --          --         --
June       --          --            --          --            --          --          --         --
July       --          --            --          --            --          --          --         --
August     --          --            --          --            --          --          --         --
September  --          --            --          --            --          --          --         --
Annual     --          --            --          --            --          --          --         --

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Annual flow duration

Annual mean discharge 05076000 THIEF RIVER NEAR THIEF RIVER FALLS, MN 
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                              Monthly and annual flow duration, in cubic feet per second
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 Percentage
  of days
 discharge   Jan.  Feb.  March  April  May  June  July  Aug.  Sept.  Oct.  Nov.  Dec.  Annual
 equaled or
  exceeded
__________________________________________________________________________________________________

  95         --    --    --     --     --   --    --    --    --     --    --    --    --
  90         --    --    --     --     --   --    --    --    --     --    --    --    --
  85         --    --    --     --     --   --    --    --    --     --    --    --    --
  80         --    --    --     --     --   --    --    --    --     --    --    --    --
  75         --    --    --     --     --   --    --    --    --     --    --    --    --
  70         --    --    --     --     --   --    --    --    --     --    --    --    --
  65         --    --    --     --     --   --    --    --    --     --    --    --    --
  60         --    --    --     --     --   --    --    --    --     --    --    --    --
  55         --    --    --     --     --   --    --    --    --     --    --    --    --
  50         --    --    --     --     --   --    --    --    --     --    --    --    --
  45         --    --    --     --     --   --    --    --    --     --    --    --    --
  40         --    --    --     --     --   --    --    --    --     --    --    --    --
  35         --    --    --     --     --   --    --    --    --     --    --    --    --
  30         --    --    --     --     --   --    --    --    --     --    --    --    --
  25         --    --    --     --     --   --    --    --    --     --    --    --    --
  20         --    --    --     --     --   --    --    --    --     --    --    --    --
  15         --    --    --     --     --   --    --    --    --     --    --    --    --
  10         --    --    --     --     --   --    --    --    --     --    --    --    --
  5          --    --    --     --     --   --    --    --    --     --    --    --    --

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                            Probability of annual high discharges
                           [ng, statistic not given; --, no data]
__________________________________________________________________________________________________

                                                       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         ng           --             --            --             --
  0.95         1.05         ng           --             --            --             --
  0.90         1.11         436          --             --            --             --
  0.80         1.25         541          --             --            --             --
  0.50         2            811          --             --            --             --
  0.20         5            1,200        --             --            --             --
  0.10         10           1,470        --             --            --             --
  0.04         25           1,820        --             --            --             --
  0.02         50           2,080        --             --            --             --
  0.01         100          2,350        --             --            --             --
  0.005        200          2,620        --             --            --             --
  0.002        500          2,990        --             --            --             --

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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

1979     April 26    18.49    1,480      1989    April 16    16.93    1,000
1980     April 6     16.38    670        1990    April 16    11.39    90.0
1981     June 28     15.12    455        1991    May 23      13.44    450
1982     April 15    16.90    800        1992    April 21    16.10    740
1983     June 23     16.34    670        1993    July 26     17.95    1,240
1984     June 8      16.55    715        1994    July 8      17.02    1,150
1985     June 28     17.19    1,330      1995    March 27    14.79    450
1986     March 30    17.47    960        1996    April 19    18.57    1,950
1987     March 23    16.13    644        1997    April 16    19.00    1,400
1988     April 4     14.62    450

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

1996     April 19    18.57    1,950      1984    June 8      16.55    715
1979     April 26    18.49    1,480      1980    April 6     16.38    670
1997     April 16    19.00    1,400      1983    June 23     16.34    670
1985     June 28     17.19    1,330      1987    March 23    16.13    644
1993     July 26     17.95    1,240      1981    June 28     15.12    455
1994     July 8      17.02    1,150      1988    April 4     14.62    450
1989     April 16    16.93    1,000      1991    May 23      13.44    450
1986     March 30    17.47    960        1995    March 27    14.79    450
1982     April 15    16.90    800        1990    April 16    11.39    90.0
1992     April 21    16.10    740

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Monthly and annual mean discharges, in cubic feet per second Continued[--, no data]

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

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