Integrated water flow model is a computer program used to simulate the flow of land surface, surface water and groundwater. It is a rewrite of IGSM software. Iwfm program and source code are provided free of charge. It uses finite element method to simulate groundwater flow. Surface water flow can be simulated by a simple one-dimensional flow network or by moving wave method. Allows users to run models for a specific period of time while editing input files. Iwfm simulates four land use categories: agriculture, urban, native vegetation and riparian vegetation. Land use area is divided into a time series with corresponding evapotranspiration rate and water management parameters. In the agricultural and urban land use categories, iwfm applies surface water and groundwater according to a specific ratio, and can selectively adjust surface water and groundwater to meet water demand.

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.

Biome BGC model is a calculation program for assessing the energy, water, carbon and nitrogen flux and storage of vegetation and soil components of terrestrial ecosystems. The main purpose of this study is to study the interaction among global climate, disturbance and biogeochemical cycle. It represents the flux of energy and mass controlled by physical and biological processes.

Ecohat system is based on the study of eco hydrological process mechanism, starting from the basic water cycle process, adding nutrient migration and transformation process in the water cycle process, comprehensively considering the interaction of vegetation / biological growth, water cycle elements and nutrients in land water ecosystem. The ecohat system model is built on the basis of integrating the advantages of eco hydrological process models with physical and chemical mechanisms at home and abroad. After model adjustment, the model adopts parameters suitable for China's natural conditions to establish a localized database. Ecohat system realizes pixel based model operation by inputting regional spatial grid parameters. Therefore, ecohat system is a completely distributed integrated simulation system of eco hydrological process. Ecohat system includes four parts: water cycle, nutrient cycle, plant growth and aquatic environment response. Water cycle is the core of the system and runs through the other three parts. The simulation of water cycle in ecohat system includes five processes: rainfall infiltration, surface runoff, evapotranspiration, root water absorption and soil moisture; nutrient cycle mainly includes the simulation of nitrification, denitrification and ammonia volatilization in soil, the simulation of base cation cycle in soil, and the quantitative simulation of adsorbed phosphorus produced by soil erosion process; plant growth It includes vegetation ecological water use simulation, vegetation NPP (net primary productivity) simulation, productivity distribution process simulation and vegetation nutrient element absorption simulation.

Anuga hydrodynamic modeling tool can build complex 2D hydrodynamic model. For example, simulate the fracture of a dam or the impact of natural disasters such as storms and tsunamis. A research area must be designated as a triangular unit, if applicable, to determine topography and bathymetric measurements, friction, initial water level values (Anuga referred to as the first stage), boundary conditions and forces such as rainfall, river flow, wind stress and pressure gradient networks. Anuga simulated the evolution of water depth and horizontal momentum with time in each element by solving the shallow water wave equation and using the finite volume method.

Thresh model is a precipitation tracking program, which is used to calculate various precipitation indexes to compare with the existing or experimental threshold of landslide occurrence. The program calculates the cumulative precipitation, precipitation intensity and precipitation duration, and compares the results with the threshold value to determine the threshold value used in landslide early warning. This command-line program is used with Python and shell scripts for input files and visualization results.