Hydrologic Model System (HMS), a physically-based distributed-parameter model system, was developed by Zhongbo Yu and his group to simulate the hydrologic response of large river basins. It comprises pre-processcing, post-preocesscing, and four modules, which are Soil Hydrologic Model (SHM), Terrestrial Hydrologic Model (THM), Ground-water Hydrologic Model (GHM), and Channel Ground-water Interaction (CGI). HMS is designed to model the hydrologic processces, such as vertical soil moisture flow, evapotranspiration (ET), infiltration, overland flow, channel flow, and ground-water flow within a river basin.
