PNL-3162 PATHS Groundwater Hydrologic Code-PATHS is a first-level (simplest), idealized, hybrid analytical/numerical code for two-dimensional, saturated groundwater flow and single component transport. The geology of the modeled region must be homogeneous. PNL-3160 VTT (Variable Thickness Transient) Groundwater Hydrologic Code-VTT is a second-level (intermediate complexity) twodimensional saturated groundwater flow code, using the Boussinesq approximation, finite difference approach. It has two-dimensional (quasi three-dimensional) multiaquifer capability. Heterogeneous geology is considered. PNL-2939 FE3DGW (Finite-Element, Three-Dimensional Groundwater) Hydrologic Code-FE3DGW is a third-level (high complexity) three-dimensional, finite-element approach (Galerkin formulation) to solve for saturated groundwater flow. Heterogeneous geology is considered .
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