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OF THE

UNIVERSITY

OF

tion of the rainfall on the Sacandaga drainage to that on the entire drainage above Mechanicville.

There were many short term records also available for parts of the territory not otherwise covered, and in order to compensate for abnormal rainfall of certain years and reduce all of these observations to the same basis before drawing the isohyetals, the method was adopted of correcting the average of each short term series of records to make it conform to the normal or long term average by first finding at the neighboring long term stations what percentage the rainfall in each of the years covered by the said short record had borne to the long term average and then compensating the average of the short term series in the same ratio. The following tables will make the method clear.

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RECORDS OF RAINFALL AT STATIONS IN OR NEAR THE DRAINAGE AREA OF THE HUDSON RIVER, ABOVE MECHANICVILLE. COMPENSATED FOR SHORT TERM VARIATIONS.

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Per cent.

Inches.

Albany.

97

38.72

81

Axton.

1,600

40.23

Blue Mt. Lake.

1,771

48.94

Burlington..

346

32.81

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1826-1906.

100

38.7

1 1900.

102

39.6

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8 1891-'92; 1894-'98; 1905.

1891-'92; 1903-'04; 1906.

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3 1901; 1904; 1906.

99

34.4

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1898-'99; 1901-'06

100

37.2

1867-1869

108

44.7

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