Scientific Investigations Report 2007–5050
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5050
Version 1.1, April 2010
Table 3. Estimates of major hydrologic budget elements of the upper Klamath Basin, Oregon and California.
[ET, evapotranspiration; values in million acre feet per year; PRISM, Parameter-elevation Regressions on Independent Slopes Model (Oregon State University, PRISM Group, 2006); CDWR, California Department of Water Resources; USFWS, U.S. Fish and Wildlife Service; USGS, U.S. Geological Survey]
| Budget element | Value | Source and remarks |
|---|---|---|
| Inflow | ||
| Precipitation | 10 | 1971–2000 average from PRISM |
| Subsurface inflow | unknown | Assumed to be negligible |
| Total inflow | 10 | |
| Outflow | ||
| Subsurface outflow | unknown | Assumed to be negligible |
| Surface outflow at Iron Gate Dam | 1.5 | 1961–2004 annual average (USGS gage data) |
| Net diversions to other basins | .03 | 1960–1996 annual average from LaMarche (2001). Does not include diversion to City of Yreka from Fall Creek |
| ET from agricultural lands | ||
| Bureau of Reclamation Klamath | .48 | 1999 and 2000 average (Burt and Freeman, 2003) |
| Non-Project land in Oregon | .20 | Cooper (2004) |
| Non-Project land in California | .07 | Estimated from CDWR 2000 land-use survey |
| ET from major wetlands | ||
| Tule Lake and Klamath Refuge (not including open water) | .22 | 2003–05 average (Risley and Gannett, 2006) |
| Upper Klamath Lake fringe wetlands | .29 | 1965–67 average (Hubbard, 1970) |
| Klamath Marsh | .17 | Estimated using the method of Priestly and Taylor (1972) (Tim Mayer, U.S. Fish and Wildlife Service, written commun., 2005) |
| ET from nonagricultural areas within the Klamath Project | .08 | 1999 and 2000 average (Burt and Freeman, 2003) |
| Subtotal outflow | 3.0 | |
| Estimated ET from nonagricultural and upland areas outside the Project | 7.0 | Total inflow minus outflow subtotal |
| Total outflow | 10 | |
U.S.
Department of the Interior | U.S. Geological
Survey
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