CROPWAT is a model developed by the food and Agriculture Organization of the United Nations (FAO) in 1991. It can help agrometeorologists, agronomists and irrigation engineers to calculate evapotranspiration and irrigation water requirements in a standard way. In addition, CROPWAT can suggest how to improve irrigation methods, plan irrigation schedules under different water supply conditions, and evaluate the impact on crop yields under rain sampling conditions or under sufficient irrigation conditions. The basic functions of CROPWAT include: (1) reference crop evapotranspiration (2) crop evapotranspiration (3) crop irrigation water requirement (4) formulation of irrigation schedule (5) evaluation of crop yield under rain fed or under sufficient irrigation conditions.

PRMs is a modular design modeling system for assessing the impacts of various combinations of precipitation, climate and land use on surface runoff, sediment yield and general watershed hydrology.

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.

Modular ocean model (MOM) is a standard global ocean circulation model used by many researchers in the world. The origin of this model can be traced back to the community code originally developed by Kirk Bryan and Mike Cox in the 1960s, and many other global ocean models can be traced back to their origins. In the early 1990s, Ron pacanowski, Keith Dixon, and Tony Rosati redesigned the old code into a more modern format, while Steve griffies led the development of mom since 2000. However, mom is really a community code, and many people, both in gfdl and around the world, have made fundamental contributions to its successful development over the years.

HEC-HMS model is a watershed flood simulation system developed by the hydrological engineering center of the US Army Corps of engineers. It is a semi Distributed Rainfall Runoff Model with physical concept. According to the formation process of rainfall runoff, it is divided into four calculation parts: net rainfall process, direct runoff process, base flow and river confluence, which are mainly used to simulate runoff process in tree basin.

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.