عنوان مقاله [English]
نویسندگان [English]چکیده [English]
Water movement in the soil is one of the natural complex processes that affects the management and hydrologic conditions of watersheds. Therefore, studying the infiltration process is very important in the natural resources, fields. The purpose of this research is to investigate the infiltration equations in different hydrological groups of soils in arid and semi-arid watersheds. To measure the infiltration amounts, the double ring method was used at 10 points for two soil hydrological groups of A and B, in Manshad watershed. Then, the cumulative infiltration at each point was determined using equation of Philip, Luis-Kostiakove, Kostiakove and SCS. To determine the most appropriate infiltration equations for the soil hydrological groups, the mean absolute error (MAE) and standard error (SE) were calculated. Based on the obtained results, Luis-Kostiakove equation was the most appropriate method of measuring infiltration for both A and B soil hydrological groups as the values of MAE and SE in this model were less than those in the other models, equal to 0.49 and 0.63, respectively.