SQUARE BUTTE CREEK BASIN

                                         06342260  SQUARE BUTTE CREEK BELOW CENTER, ND

LOCATION.--Lat 4703'25", long 10111'35", in SE1/4 sec.4, T.141 N., R.83 W., Oliver County, Hydrologic Unit 10130101, on right
   bank at southeast corner of farmyard and 6 mi southeast of Center.

DRAINAGE AREA.--146 mi2.

                                                    WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--May 1965 to current year.

GAGE.--Water-stage recorder. Elevation of gage is 1,865 ft above sea level, from topographic map.

REMARKS.--Records fair except for periods of estimated discharge, which are poor. Flow regulated by Nelson Lake 1.5 mi upstream
   beginning Aug. 24, 1967, capacity 5,000 acre-ft. The capacity of Nelson Lake was increased to 10,000 acre-ft in Aug. 1975.

                          DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
                                                       DAILY MEAN VALUES

        DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

          1       .65      1.3      2.2     e1.6     e1.3    e42        1.5      4.7     1.2       1.7      2.2      2.3
          2       .75      1.9      2.2     e1.6     e1.4    e14        1.7      7.5     1.0       2.4      2.3      2.6
          3       .78      1.9      2.2     e1.7     e1.5    139        1.5      7.4     1.0       2.4      2.4      2.4
          4       .86      1.9      2.1     e1.6     e1.5    188        1.4      7.2     1.1       2.2      2.2      2.2
          5      1.1       1.9      2.0     e1.5     e1.4    152        1.7      7.2      .77      2.3      2.6      2.2

          6       .89      2.4      2.1     e1.5     e1.4     51        1.6      7.3      .84      2.2      2.2      2.1
          7      1.2       2.3      2.1     e1.5     e1.5     16        1.9      7.4      .77      1.8      2.2      2.1
          8      1.4       2.3      1.9     e1.4     e1.5     14        2.0     16        .87      1.9      2.2      2.1
          9      1.9       2.3      1.8     e1.4     e1.4     14        2.1     17        .92      2.2      2.2      2.1
         10      2.3       2.2      1.8     e1.5     e1.3     14        2.3     17        .90      2.2      2.2      2.1

         11      2.4       2.2      1.9     e1.4     e1.2     14        2.6     18        .79    140        2.2      2.1
         12      2.5       2.2      1.9     e1.4     e1.2     14        2.5     17        .91      2.2      2.2      2.1
         13      1.8       2.1      1.9     e1.4     e1.3     17        3.3     17       2.5       1.6      2.2      2.1
         14      1.7       2.1      1.9     e1.5     e1.2     21        4.2     17      14         1.6      2.2      2.1
         15      1.8       2.1     e1.8     e1.4     e1.2    e20      139       17      77         1.6      2.2      2.3

         16      1.7       2.0     e1.7     e1.5     e1.1    e17       13       17     143         1.6      2.4      2.1
         17      1.9       2.1     e1.7     e1.5     e1.2    e14        1.9     17       5.5       1.7      2.2      2.1
         18      2.1       2.2     e1.6     e1.4     e1.2    e13        1.8     17      94         2.0      2.3      2.1
         19      1.9       2.2     e1.7     e1.4     e1.3    e11        1.7     17       5.2       2.2      2.3      2.3
         20      1.9       2.2     e1.8     e1.3     e1.3     e6.0      1.8     17       4.9       2.2      2.5      2.3

         21      1.9       2.2     e1.8     e1.3     e1.3     e4.0      1.8     17      17         2.2      2.6      2.2
         22      1.8       2.2     e1.7     e1.2     e1.4     e2.0      1.8     17      21         2.2      2.4      2.1
         23      1.9       2.1     e1.7     e1.2    e10       e1.5      1.9     17      25         2.2      2.3      2.1
         24      1.9       2.1     e1.8     e1.3    e50       e1.6      2.2     17      71         2.1      2.3      2.2
         25      1.6       2.1     e1.7     e1.3    e90       e1.6      2.6     11      38         2.1      2.3      2.1
       
         26      1.6       2.1     e1.8     e1.2    e80       e1.5      2.6      4.9     1.2       3.2      2.3      1.9
         27      1.7       2.1     e1.7     e1.2    e53       e1.5      2.6      1.6     1.1       5.8      2.5      1.9
         28      1.6       2.1     e1.8     e1.3    e51       e1.5      2.5      1.3     1.3       5.6      2.4      1.9
         29      1.6       2.1     e1.8     e1.3    e55       e1.6      2.4      1.2     1.5       5.6      2.2      2.0
         30      1.6       2.2     e1.7     e1.3      ---     e1.7      2.7      1.2     1.6       4.9      2.3      1.9
         31      1.6       ---     e1.6     e1.2      ---     e1.6      ---      1.0      ---      2.0      2.3      ---

        TOTAL   50.33     63.1     57.4     43.3    418.1    811.1    212.6    359.9   535.87    215.9     71.3     64.1
        MEAN     1.62     2.10     1.85     1.40     14.4     26.2     7.09     11.6     17.9     6.96     2.30     2.14
        MAX       2.5      2.4      2.2      1.7       90      188      139       18      143      140      2.6      2.6
        MIN       .65      1.3      1.6      1.2      1.1      1.5      1.4      1.0      .77      1.6      2.2      1.9
        AC-FT     100      125      114       86      829     1610      422      714     1060      428      141      127

        STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1965 - 2000, BY WATER YEAR (WY)

        MEAN     1.53     1.43     1.39     1.34     7.55     54.8     37.0     9.81     6.10     10.5     3.05     1.62
        MAX      2.98     2.99     3.35     2.04      109      216      223     47.8     65.0      175     34.5     3.64
        (WY)     1981     1983     1978     1983     1996     1987     1969     1995     1966     1993     1993     1980
        MIN       .24      .19      .21      .20     .089     1.24     1.00      .79      .57      .71      .83      .35
        (WY)     1968     1968     1968     1968     1966     1998     1998     1989     1989     1989     1982     1967

        SUMMARY STATISTICS           FOR 1999 CALENDAR YEAR        FOR 2000 WATER YEAR           WATER YEARS 1965 - 2000

        ANNUAL TOTAL                        4968.88                    2903.00
        ANNUAL MEAN                           13.6                        7.93                      11.4
        HIGHEST ANNUAL MEAN                                                                         30.0            1969
        LOWEST ANNUAL MEAN                                                                            .86           1968
        HIGHEST DAILY MEAN                   641     Mar 16             188     Mar  4            2670       Jul 18 1969
        LOWEST DAILY MEAN                       .56  Sep 28                .65  Oct  1                .00    Feb 14 1966
        ANNUAL SEVEN-DAY MINIMUM                .65  Sep 24                .84  Jun  5                .00    Feb 14 1966
        INSTANTANEOUS PEAK FLOW                                         624     Jul 11            9700       Jun 24 1966
        INSTANTANEOUS PEAK STAGE                                          6.22  Jul 11              14.35    Jun 24 1966
        INSTANTANEOUS LOW FLOW                                                                        .00    Feb 14 1966
        ANNUAL RUNOFF (AC-FT)               9860                       5760                       8260
        10 PERCENT EXCEEDS                    30                         17                          7.2
        50 PERCENT EXCEEDS                     1.8                        2.1                        1.5
        90 PERCENT EXCEEDS                     1.1                        1.3                         .90

        e  Estimated

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