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Notes on Rso – use complex method <br />19 <br />Complex method used to calculate Rso (clear sky envelope): <br />•ASCE-EWRI (2005) provides two methods to calculate clear <br />sky radiation; simple and complex. Complex considers <br />precipitable water in the atmosphere. <br />•The ASCE-EWRI ET committee recommended in 2009 that <br />the more complex method should be used for both quality <br />control and for calculation of net radiation using the ASCE <br />standardized method (from Allen 2013). <br />Allen, R. (2013). “Users Manual - Ref-ET Reference Evapotranspiration Calculator Version - <br />Windows 3.1.15”. University of Idaho Research and Extension Center, Kimberly, Idaho.