CH3D-WES (Curvilinear Hydrodynamics in 3-Dimensions – Waterways Experiment Station) is a time-varying three-dimensional numerical hydrodynamic, salinity, and temperature model. The water surface, 3-D velocity field, and 3-D salinity fields are computed. Major physical processes affecting circulation and vertical mixing of a large water body are modeled. The model solves the transformed equations on a boundary-fitted grid in both the horizontal and vertical planes. The horizontal grid is a general nonorthogonal curvilinear grid; the vertical grid is a sigma-stretched grid. A newly developed mobile bed version of CH3D-WES is called CH3D-SED.