https://www.usgs.gov/software/precipitation-runoff-modeling-system-prms

The primary objectives of PRMS are:

1. simulate hydrologic processes including evaporation, transpiration, runoff, infiltration, and interflow as determined by the energy and water budgets of the plant canopy, snowpack, and soil zone on the basis of distributed climate information (temperature, precipitation, and solar radiation);

2. simulate hydrologic water budgets at the watershed scale for temporal scales ranging from days to centuries;

3. integrate PRMS with other models used for natural-resource management or with models from other scientific disciplines;

4. provide a modular design that allows for selection of alternative hydrologic-process algorithms from the standard PRMS module library.