Study the water infiltration in soil using double ring in different regions of Lorestan province

The water infiltration into the soil is one of the main components of the hydrological cycle, which is very important in various topics. Therefore, it is necessary to evaluate different methods of estimating it. In this study, 11 points in different regions of Lorestan province were selected and the methods of Kastyakov, modified Kastyakov, Philip and SCS were evaluated. also, Infiltration measured using a dual loop at these points. The results showed that the Kastyakov model for the regions: Sarnaveh, Kuhdasht, Poldakhtar, Jojeh Heydar and Doroud, the SCS model for the regions: Azna, Dehpahlavan, Sarnamak and Aznasagvand and the Philip model for the Khayan and Kioreh regions have the most accurate compared to the observational data. Based on the analysis of variance, the amount of infiltration estimated by all 4 methods was not significantly different from the amount of field infiltration. In general, it can be said that in most of the studied areas, the performance of the Kastyakov model was acceptable and the performance of the SCS model was poor.