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This study was conducted to evaluate and test the performance of DRAINMOD for an experimental site in Northern Turkey. The site consisted of two plots drained by subsurface drain tubes 1.0 m deep and 25 m apart. Each plot was instrumented to measure water table depths and subsurface drainage flows. Soil water conditions were simulated and observed for a crop rotation of soybean, corn and winter wheat. Results showed that the model did a good job in describing the hydrology of the site. Comparison of predicted and measured water table elevations and subsurface drain flows were in excellent agreement, with the daily water table depths and drainage flows having standard errors of estimate ranging from 7.35 cm to 8.65 cm and from 0.082 cm/day to 0.170 cm/day, respectively. The results of this study indicated DRAINMOD could be reliably used to predict the effect of drainage system design on water table elevations..