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.

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.

Saysmosd is a computer program used to predict soil moisture, salinity of groundwater and drainage, depth of groundwater table, and drainage flow in irrigated farmland, using different hydrogeological and aquifer conditions to send different water management options, including groundwater for irrigation, and some crop rotation schedules, where spatial changes are explained by polygonal networks 。