Wasp is a water quality model system proposed by the U.S. Environmental Protection Agency. It can be used in different environmental pollution decision-making systems to analyze and predict various water quality conditions caused by natural and man-made pollution. It can simulate hydrodynamics, one-dimensional unsteady flow of rivers, three-dimensional unsteady flow of lakes and estuaries, conventional pollutants (including dissolved oxygen, biological oxygen consumption, nutrients and algae) The law of migration and transformation of pollutants (including organic chemicals, metals and sediments) in water is called universal water quality model.

Parflow is an open source, object-oriented and parallel watershed scale model. It includes a fully integrated land flow with the ability to simulate complex topography, geology and heterogeneity, as well as land surface processes including land energy budget, biogeochemistry, and snow (through CLM). It can run on multiple platforms. Parflow is the result of a long, multi agency development history and is now a collaboration between CSM, LLNL, uni Bonn and UCB. Parflow is combined with mesoscale, weather code ARPS and NCAR code WRF.

Cxtfit is a computer software developed by the saline soil laboratory of the United States to study one-dimensional soil solute transport. Based on Levenberg Marquardt algorithm, cxtfit uses the function optimization method of nonlinear least square to fit the breakthrough curve of solute mixture replacement experiment, solves the model parameters, and predicts the concentration distribution of solute in soil with time and space. Cxtfit is based on the solute convection dispersion equation. The original cxtfit1.0 was developed and compiled by Parker and van Genuchten, and gradually improved into today's cxtfit2.0, which contains more equation analysis for different initial boundary value problems and generation problems. The software includes three different types of solute transport models: equilibrium CDE model, physicochemical nonequilibrium CDE model and stochastic flow tube model.

MSSW is a computer program to simulate the movement of solute in water. The program solved Richards' saturated unsaturated water flow equation and solute transport convection dispersion equation numerically.

Geosfm hydrological model is studied by the center for earth resources observation and Science (EROS) of the U.S. Geological Survey (USGS). Its biggest feature is that the satellite remote sensing precipitation products can be directly used as the driving parameters of the model. The geosfm hydrological model has been applied to the Nile River Basin in Africa, Mekong River in Asia and bagmati River Basin in Nepal. Geosfm can create a common visual environment to monitor hydrogeological conditions in a wide range of areas, including topographic analysis, data assimilation and time series processing, and display the monitoring results.

GSFLOW The model is developed by the U.S. Geological Survey to simulate the interaction between surface water and groundwater. The model considers the relationship between meteorological conditions, surface runoff, groundwater runoff and the interaction between surface water and groundwater. It is coupled with the rainfall runoff simulation system PRMs and the three-dimensional finite difference model modflow-2005. The model is suitable for the simulation of non spatial and temporal scales In order to evaluate the impacts of land use change, climate change and groundwater exploitation on surface hydrological process and underground hydrological process.