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)	Crop^a year precipitation 1 August - 31 July (inches)	Percent of 548 basins containing water
				1-15 May	1-15 August
1964	15^b	21.44	20.56	no data	no data
1965	31.5	22.92	16.52	71	60
1966	42^c	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	12^d
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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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.

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.