HSPF (hydraulic simulation program - FORTRAN) model is a mathematical model developed by the U.S. Environmental Protection Agency (EPA). It is used for continuous simulation of hydrological and water quality processes in a large watershed under natural and artificial conditions. The model is written in FORTRAN language and based on Stanford hydrological model. It can comprehensively simulate runoff, soil loss, pollutant transport, river hydraulic and other processes, and is widely used in the scenario simulation of watershed water environment effects of climate change and land use change. The model is an excellent representative of semi distributed hydrological and water quality model, HSPF model is widely used in foreign countries. HSPF model includes perlnd, implnd and rchres to simulate the hydrology and water quality of permeable section, impervious section and surface water body respectively. Generally speaking, HSPF model plays an important role in the simulation of hydrology and water quality process in foreign countries, as well as scenario analysis involving climate change and land use impact, But the application of this model in China is very limited

Calite model is an interactive screening model planned and managed by the state water project (SWP) and the Central Valley Project (CVP) in California. It simulates the hydrology of the Central Valley, reservoir operation and delivery allocation decisions to SWP and CVP, delta salinity response to changes in river flow and outlet, and resident ecosystem index. The power of filtering models like callite is the ability to quickly simulate system operations and merge changes relatively easily. The current version of calite simulates the operation of the system on a monthly basis. On the latest modeling computer, it takes about 6 minutes (compared with 30 minutes of calsim), recording a full 82 years of records (water year 1922-2003). Scenarios can be run using a variety of different user specified parameters related to hydrometeorology, requirements, facilities and infrastructure, regulations, and system operations. Through the integrated post-processing tools of the model, we can observe, compare and analyze the results.

Esap-95 software package contains a series of site salinity modeling software programs for analyzing and predicting soil salinity information. Esap-95 software package currently contains three software programs: esap-rssd, ESAP calibrate and ESAP saltmapper. The esap-rssd program is designed to produce the best results of soil sampling designs from bulk soil conductivity surveys. Esapcalibrate program is designed to estimate stochastic (regression model) and deterministic (soil) theoretical basis) calibration equations; i.e. These equations are eventually used to predict the spatial values of one or more soil variables, derived from electrical conductivity measurements. ESAP saltmappercheng program can be used to produce high-quality 1D or 2D graphics, output electrical measurement data or predict soil variables.

Pamolare II is a SDM model centered on phreatic lake, which is used for lake eutrophication management. It can adapt to wetland conditions. Pamolare II also considers species competition (hydrophytes and phytoplankton) and interactions between macrophytes and macrophytes.

LSPC is a watershed modeling system, including streamline hydrological simulation program FORTRAN (HSPF) algorithm, which is used to simulate hydrology, sediment and general water quality on land, as well as simplified river transport model. LSPC is derived from the mining data analysis system (MDAS) developed by the U.S. Environmental Protection Agency's zone 3, and is widely used in mining applications and TMDLs. A key data management feature of the system is that it uses Microsoft Access database to manage model data and weather text files to drive simulation. The system also includes a module to assist TMDL calculation and source allocation. For each model run, it will automatically generate a comprehensive text file output of the sub watershed for all layers, arrival and simulation modules, which can be represented at hourly or daily intervals. The output of the LSPC is associated with other model applications, such as EFDC, wasp, and - qual-w2. LSPC has no inherent limitations in modeling scale or model operation. The Microsoft Visual C + + programming architecture allows seamless integration with modern, widely used software such as Microsoft Access and excel.

The n3dade model is used to evaluate solute transport in three-dimensional nonequilibrium porous media.

Multi flow confluence algorithm model