Abstract: Time-series analyses of the comparative performance indicators in irrigation schemes allow us to analyze changes in the schemes due to agricultural and hydrologic interventions. In this study, six comparative performance indicators developed by the International Water Management Institute (IWMI) were applied to 10 irrigation schemes in Cukurova region of Turkey for the period of 1995-2001. Although no significant difference was determined among the means of the schemes for the output per unit land and water, the difference was very significant for irrigation intensity and relative water supply for the same period based on the ANOVA test results. The variation in output per unit land and water was attributed to the cropping pattern and intensity. Although more water than the requirement was applied to the schemes, relatively low output per unit land and water was obtained. This suggest that the schemes are not properly managed possibly due to inappropriate crop pattern and intensity, irrigation infrastructure, reliability of the data, education level of the managers and farmers and structure of the administration.