Scientific Investigations Report 2007–5050
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5050
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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