《Table 2 Correlation equation slopes between E0 and E601》

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《Comparing phreatic evaporation at zero water table depth with water surface evaporation》

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Note:E0，phreatic evaporation at zero water table depth；E601，water surface evaporation；β，slope；R2，determination coefficient；R，correlation coefficient；R0.01，critical correlation coefficient.

Thus，ifβequals 1，then E0 is equal to E601.Results further reveal the slope of the correlation equation between phreatic evaporation of the six soil types when water table depth is zero and E601 within the Weigan River irrigation district（Table 2）；as these data show that theβvalue corresponding to the six soil types does not equal one，replacing E0 with E601 and establishing an empirical equation to calculate phreatic evaporation corresponding to different water table depths will generate a larger error.