Abstract
In the study, variability in reference
evapotranspiration (ET0) from Southeastern Anatolian Project (GAP)
area was investigated with linear regression method. For the purpose, seasonal ET0
time series were formed from monthly reference evapotranspiration (ET0).
The ET0 data sets of three sites showed a statistically significance
decreasing trend while there was upward trend in some seasons of two
sites. But, variation in all seasonal ET0 time
series of Kilis site was not detected.