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Mean annual recharge from precipitation, inches (x 1000), upper Umatilla River Basin, Oregon, 1981 - 2010 This data set contains mean annual recharge due to infiltration of precipitation, in inches (x 1000), within the upper Umatilla River Basin, Oregon, for calendar years 1981 - 2010. Recharge due to infiltration of precipitation is estimated using a regression method developed by Bauer and Vaccaro (1990) that relates annual recharge to annual precipitation. Gridded mean annual precipitation for years 1981 - 2010 was provided by the Oregon State University PRISM Climate Group. References: Bauer, H.H., and Vaccaro, J.J., 1990, Estimates of ground-water recharge to the Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho, for predevelopment and current land-use conditions: U.S. Geological Survey... Categories: Data; Types: Downloadable, GeoTIFF, Map Service, Raster; Tags: Pendleton, Umatilla County, groundwater, inlandWaters, water cycle