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As there is no direct measurement of ET over the study area, the method used by Jia et al. (2009) in the case of the Yellow River Basin in China was used for the inter-comparison process. Jia et al. (2009) proposed an alternative method to make comparisons with modeled and observed data. In their method, ET was estimated by multiplying the reference ET derived from the Penman–Monteith equation by the crop coefficients. In this study, reference evaporation estimation calculated by the Penman–Monteith ASCE version was used to make comparison with the METRIC ET outputs. Converting the reference ET to actual ET was made by the crop coefficient for olive trees. Pastor & Orgaz (1994) determined the crop coefficient (Kc) values of olive trees on a monthly basis for the area, 60% of which is covered with olive trees (Table 3). For inter-comparison purposes, 10 points covered with olive trees in the study area were chosen.

Table 3

Crop coefficients for olive orchard (Pastor & Orgaz 1994)

MonthsKc coefficientsMonthsKc coefficients
January 0.5 July 0.45 
February 0.5 August 0.45 
March 0.65 September 0.55 
April 0.60 October 0.60 
May 0.55 November 0.65 
June 0.50 December 0.50 
MonthsKc coefficientsMonthsKc coefficients
January 0.5 July 0.45 
February 0.5 August 0.45 
March 0.65 September 0.55 
April 0.60 October 0.60 
May 0.55 November 0.65 
June 0.50 December 0.50 

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