Unsoda v2.0 is a database of unsaturated soil hydraulic properties completed by the U.S. geotechnical office in 1999. It collects the data of soil physical properties such as water characteristic curve, hydraulic conductivity and soil water dispersion, particle size distribution, bulk density and organic matter content of 11 different texture soils from sandy soil to clay.

BIOME3 model is a balanced terrestrial biosphere model. It attempts to combine biogeography and biogeochemical modeling to simulate vegetation distribution and biogeochemical characteristics in a global framework, and to couple vegetation distribution into biogeochemistry.

The recess program is used to determine the decline index and determine the main decline curve from the analysis of runoff records.