The Groundwater Modeling System (GMS) is the most sophisticated and comprehensive groundwater modeling software available! Used by thousands of people at U.S. Government agencies, private firms, and international sites in over 90 countries, it has proven to be the modeling system of choice for groundwater professionals. GMS provides tools for every phase of a groundwater simulation including site characterization, model development, calibration, post-processing, and visualization. GMS supports both finite-difference and finite-element models in 2D and 3D including MODFLOW 2000, MODPATH, MT3DMS, RT3D, SEAM3D, UTCHEM, FEMWATER, PEST, MODAEM, SEEP2D and UTEXAS. Regardless of your modeling needs, GMS has the tools! Learn More

The Watershed Modeling System (WMS) is a comprehensive graphical modeling environment for all phases of watershed hydrology and hydraulics. WMS includes powerful tools to automate modeling processes such as automated basin delineation, geometric parameter calculations, GIS overlay computations (CN, rainfall depth, roughness coefficients, etc.), cross-section extraction from terrain data, and many more! With the release of WMS 8, the software now supports hydrologic modeling with HEC-1 (HEC-HMS), TR-20, TR-55, Rational Method, NFF, MODRAT, OC Rational, and HSPF. Hydraulic models supported include HEC-RAS, SMPDBK, and CE QUAL W2. 2D integrated hydrology (including channel hydraulics and groundwater interaction) can now be modeled with GSSHA. All of this in a GIS-based data processing framework will make the task of watershed modeling and mapping easier than ever before.. Learn More

The Surface Water Modeling System (SMS) is a comprehensive graphic user environment for one- and two-dimensional surface water models. SMS provides GIS based graphical preprocessing tools to automate mesh generation and modeling process, and advanced post-processing visualization tools for results review and presentation. SMS included a range of hydraulic and coastal models for applications including river flow analysis, contaminant and sediment transport, rural and urban flooding, estuary and inlet modeling, coastal circulation and wave modeling. Learn More