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Scientific Investigations Report 2013–5014


Evapotranspiration from Wetland and Open-Water Sites at Upper Klamath Lake, Oregon, 2008–2010


Table 6. Results of modeling daily evapotranspiration (ET) during the wetland growing season (May 1–September 30, 2008–2010, n = 457) at both sites using piecewise linear models of Kc, superseded by setting Kc = 1.5 during days of precipitation greater than 3 millimeters.


[Slope and intercept are of ordinary least squares best-fit line between modeled and measured ET. Abbreviations: -, mean evapotranspiration during the 2008–2010 growing seasons; mea, measured; mod, modeled; r 2, coefficient of determination; CE, coefficient of efficiency; RMSE, root-mean-square-error; mm d-1, millimeters per day]


Site ETmea
(mm d–1)
ETmod
(mm d–1)
r  2 CE Slope Intercept

(mm d–1)
RMSE

(mm d–1)
Bulrush 4.537 4.499 0.710 0.652 0.779 1.033 0.902
Mixed 4.376 4.340 0.733 0.704 0.834 0.756 0.870

First posted March 4, 2013

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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