A Comparative Study of Infiltration Methods Based on the SWMM Model: Application of Horton and Green-Ampt Models in Drainage System Design in Northeast China

This study conducts a comparative analysis of infiltration methods in a region of Northeast China using the SWMM model, aiming to assess the impact of different infiltration models on drainage system design. We selected the Horton infiltration method and the Green-Ampt infiltration method, derived from soil properties, to simulate rainfall-runoff processes in various areas. The results show that while the Horton method is suitable for infiltration simulations under conventional conditions, the Green-Ampt method provides more accurate results in regions with significant soil variability, offering a better reflection of actual drainage performance. The study recommends that, for drainage system design, the choice of infiltration method should be based on local soil characteristics to ensure system efficiency and reliability.