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WATER9 model helps environmental engineers to simulate the generation and atmospheric emission of gases from wastewater and other water treatment processes.

River Basin Simulation Model (RIBASIM) is a comprehensive package for analyzing the behavior of river basins under various hydrological, operational, and development scenarios.

HydroCAD is a Computer Aided Design tool used for simulating the hydrologic cycle in watersheds and developing stormwater management plans.

The Precipitation-Runoff Modeling System (PRMS) is a deterministic, distributed-parameter, physical process based model used to evaluate the impact of climate and land use change on streamflow.

MIKE SHE is an integrated hydrological modeling system for building and simulating surface water and groundwater in watersheds.

Soil and Water Assessment Tool (SWAT) is a river basin scale model developed to quantify the impact of land management practices in large, complex watersheds.

CE-QUAL-W2 is a two-dimensional (longitudinal/vertical) hydrodynamic and water quality simulation model used for rivers, reservoirs, and estuaries.

The Weather Research and Forecasting (WRF) Hydrological modeling system is a multi-scale, multi-physics model for hydrologic simulation and forecasting.

TOPMODEL is a semi-distributed, physically based hydrological model which simulates hydrologic processes based on topography.

The Dynamically Segmented Stream and Lake Model (DSSAM) is a computer simulation model used to analyze pollution in stream and lake systems.

WATFLOOD™ is a hydrological and hydraulic simulation model with applications in forecasting river flow, flood prediction, and watershed management.

The Variable Infiltration Capacity (VIC) model is a macro-scale hydrologic model that simulates vertical and horizontal water fluxes at large scales and is useful for studying land surface-atmosphere interactions.

Hydraulic Engineering Center's River Analysis System (HEC-RAS) is designed to perform one-dimensional hydraulic calculations for a full network of natural and constructed channels.

MODFLOW is the USGS modular finite-difference flow model, which is a computer code that solves the groundwater flow equation.