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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 13, issue 5
Hydrol. Earth Syst. Sci., 13, 617–627, 2009
https://doi.org/10.5194/hess-13-617-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 13, 617–627, 2009
https://doi.org/10.5194/hess-13-617-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  20 May 2009

20 May 2009

Use of satellite data to assess the impacts of irrigation withdrawals on Upper Klamath Lake, Oregon

Q. Tang, E. A. Rosenberg, and D. P. Lettenmaier Q. Tang et al.
  • Dept. of Civil and Environment Engineering, University of Washington, Seattle, WA, USA

Abstract. Competition for scarce water resources in the Upper Klamath River Basin, Oregon has generated conflict among its stakeholders, as demonstrated by recent regulations on withdrawals from Upper Klamath Lake. Information on agricultural water usage can help assess the hydrologic impacts of irrigation and support operational decisions. This paper presents an experimental satellite-based evapotranspiration estimation system that is combined with the Variable Inflitration Capacity (VIC) hydrological model to estimate irrigation consumption, which is then used to assess the effects of irrigated agriculture on lake storage volumes and water levels. The hydrological model is calibrated with streamflow observations and used to estimate unmeasured lake inflows and guide water budget calculations. When combined with the VIC model, the satellite-based evapotranspiration estimation system shows that irrigation caused a decline of 0.3 m in average annual water levels and 0.5 m in mean October water levels, and an increase of 0.5 m in annual water level ranges at the lake from 2001 to 2005. The results demonstrate the potential of satellite data for agricultural water resource management at the regional scale.

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