USGS Scientific Investigations Report 2013–5014  - Evapotranspiration from Wetland and Open-Water Sites at Upper Klamath Lake, Oregon, 2008–2010 

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Scientific Investigations Report 2013–5014 

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

Table 5. Piecewise linear expressions of crop coefficient (K_c) at both study sites during the growing season. 

[Abbreviation: DOY, day of year] 

Site	Period	Equation
Bulrush	May 1–June 6  DOY 121–157	K_c = 0.65
	June 7–July 31  DOY 158–212	K_c = 0.65 + 0.007407 × (DOY-158)
	August 1–August 23  DOY 213–235	K_c = 1.05
	August 24–September 30  DOY 236–273	K_c = 1.05-0.01622 × (DOY-236)
Mixed	May 1–June 6  DOY 121–157	K_c = 0.64
	June 7–July 23  DOY 158–204	K_c = 0.64 + 0.007609 × (DOY-158)
	July 23–August 22  DOY 205–234	K_c = 0.99
	August 23–September 30  DOY 235–273	K_c = 0.99-0.01605 × (DOY-235)

First posted March 4, 2013

Report PDF (2.6 MB)

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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