In recent years, increasing water use efficiency through precise irrigation has drawn attention of many researchers. To regularly monitor soil water in the rootzone for irrigation scheduling purposes in drip-tape irrigation system, determination of an appropriate location for soil moisture sampling is essential. The objectives of this study were to determinate an appropriate location for soil water determintion in drip-tape irrigation management as a representative of the average soil water content in the profile ( ), and to evaluate the application of HYDRUS software. Soil water samples were taken from 35?60 cm plots at two growth stages of maize and during two irrigation intervals; 48-53 and 68-73 days after planting. Soil water content was measured using the gravimetric method. Root length density was measured in the middle and at the end of growing season in each plot. The results showed that the root distribution depth, at the end of growing season, was 55 cm. However, more than 70% of root length was located up to 30 cm from the soil surface. Accepting a ±10% relative error compared to the average soil water profile, areas of the profile within the range of the accepted error, was determined with the closest approximation to the average soil moisture ( ). Overlapping the regions during the growing season, an appropriate location for soil water content measurement was determined in 0-20 cm horizontal distance from the drip tape and at a 10-20 cm depth from soil surface. The HYDRUS-2D/3D software was used to simulate the soil water distribution and to compare the simulated data with the observed data. For calibration, the van Genuchten-Mualem parameters were optimized using the inverse solution approach. The optimized parameters of ,, and n were 0.463 cm 3 cm -3 , 0.0064 cm -1 , 19.29 cm day -1 , and 1.424, respectively. Furthermore, the statistical indices of R 2 , RMSE, and NRMSE were 0.7, 0.0278, cm 3 cm -3 , and 17.42%, respectively. The model evaluation showed that R 2 , RMSE, and NRMSE, and d values were 0.802, 0.0256 cm 3 cm -3 , 15.53%, and 0.9, respectively. The values of the statistical indices indicated the ability of the model in simulating the soil water content distribution in the profile with a good accuracy. Therefore, combining the HYDRUS-2D/3D modeling results with field data is an appropriate, quick, and economic approach in determining an appropriate location for soil water content measurement under different irrigation management scenarios in drip-tape irrigation systems. Keywords : precise irrigation, soil water content distribution, maize, drip-tape irrigation, HYDRUS-2D/3D software.