عنوان مقاله [English]
In recent decades considerable progress has been made in using computer models of groundwater as a cheap and quick way for investigating the movement, balance and management of groundwater resources. In this research PMWIN and Drainmod (6) models in drainage system were evaluated and compared for two regions, Salami and Kooshkak. The results showed that Drainmod (6) model is suitable for simulation of water table fluctuations in steady state conditions in Salami (rain and irrigation periods) and Kooshkak research station (rainy season) with NRMSE 0.17 and 0.14, respectively, and agreement index (d) of 0.94 and 0.92, respectively, which are very good predictions. But the prediction of water table fluctuation by Drainmod(6) model in Kooshkak was not accurate because of large deviation of field situation from steady state condition. The results showed that the difference between observed and simulated water table depths by PMWIN model is high in both regions with NRMSE between 0.16 and 0.43 in Salami and 0.18 and 0.35 in Kooshkak. The agreement index (d) was between 0.37 and 0.56 in Kooshkak and 0.51 and 0.93 in Salami. Therefore, the PMWIN model did not show acceptable accuracy and is not suitable in drainage projects in the study areas. But, the Drainmod(6) model showed more suitable prediction of water table fluctuations in drained area than PMWIN.