Waterfowl Production on the Woodworth Station
in South-central North Dakota, 1965-1981

Table 6. A comparison of three measurement methods of precipitation or snowfall
to early spring and late summer wetland conditions,
Woodworth Study Area.


Table 6. A comparison of three measurement methods of precipitation or snowfall to early spring and late summer wetland conditions, Woodworth Study Area.
Year Past winter's snowfall
1 September - 31 May (inches)
Calendar year precipitation (inches) Cropa year precipitation
1 August - 31 July (inches)
Percent of 548 basins containing water
        1-15 May 1-15 August
1964 15b 21.44 20.56 no data no data
1965 31.5 22.92 16.52 71 60
1966 42c 13.82 22.18 87 45
1967 37 9.22 8.57 81 22
1968 21.5 17.53 16.38 52 16
1969 56 12.89 16.12 69 50
1970 39.5 13.26 12.39 61 14
1971 31 17.62 14.94 34 7
1972 26.5 12.43 14.20 70 14
1973 17.5 16.41 10.89 29 2
1974 23.5 14.89 20.43 67 6
1975 37.5 19.90 19.15 79 44
1976 36.5 8.37 12.36 56 8
1977 25 21.40 12.99 8 2
1978 22.5 14.21 19.58 61 4
1979 57.5 15.57 16.50 72 45
1980 23 17.69 11.35 25 5
1981 18 15.12 16.56 24 12d
Mean (n = 18) 31.0 15.82 15.65 56 21
aFrom 1 August of preceding year to 31 July of calendar year
bApril snow amounts were missing but 2.59 inches of moisture was measured. Arrowwood NWR showed 7.8cm of snow for April.
c24 inches was measured from March blizzard.
dLate July survey.


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