Annual average precipitation for Copper River basin

Clipped from Alaska polygon coverage created from a 1:2,000,000 scale map showing lines of equal annual precipitation. The precipitation map was prepared in 1994 as part of a flood frequency study of the streams and rivers of Alaska and was digitized into a GIS format. Precipitation values for polygons were set to equal the average value of their bounding lines of equal annual precipitation.

Jones, S.H., and Fahl, C.B., 1994, Magnitude and frequency of floods in Alaska and conterminous basins of Canada: U.S. Geological Survey Water-Resources Investigations Report 93-4179, 122 p., 2 plates.