The aim of this research was to figure out certain limitations of methods for drain spacing determination application in unsteady-state of flow rate to the drains in the eugley soil. The well-known Glover-Dumm method was taken in this analysis. The analysis was based on the results of drain discharge and water table depth measurements. Measurements were carried out on the experimental field. Three different drainage treatments were set up with three different drainage spacings such as 10 m, 20 m and 30 m. The results of analysis showed significant constraints of the method due to non-modeling dynamic of water flow to the drains. These effects are marked on the plot with the least drain spacing (10 m).