What is the Integrated Hydrologic Model?
The Integrated Hydrologic Model (IHM) is a powerful computing tool that is designed to simulate all surface and subsurface processes of the hydrologic cycle and their dynamic interactions within a Windows operating system environment. The IHM couples two well established and broadly used model codes to simulate hydrologic processes: Hydrologic Simulation Program–FORTRAN (HSPF) to simulate surface and vadose zone processes and MODFLOW to simulate saturated groundwater processes. IHM simulations have durations ranging between 1 day to many years or decades and model domains ranging from 0.01 to 10,000 square miles. The IHM represents the third generation of HSPF–MODFLOW coupling which was first developed in the late 1980s and is the product of a collaborative effort between Tampa Bay Water and the Southwest Florida Water Management District.