Preliminary Estimations: Willamette

Range for Annual Precipitation

40 - 100 in
1016 - 2540 mm

Annual discharge per unit area

3.76 ft3/mi2
0.041 m3/km2

Monthly flow as a percent of Annual Flow (%)

OCT

NOV

DEC

JAN

FEB

MAR

APR

MAY

JUNE

JULY

AUG

SEPT
4
10
15
16
14
11
9
8
5
3
2
3

*Note: Values for monthly flow as a percentage of annual flow do not add up to 100% due to overlapping of drainage areas (i.e., nesting) of some or all gages used to calculate the percentages.

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