The Thornthwaite water balance (Thornthwaite, 1948; Mather, 1978; 1979) uses an accounting procedure to analyze the allocation of water among various components of the hydrologic system. Inputs to the model are monthly temperature and precipitation. Outputs include monthly potential and actual evapotranspiration, soil moisture storage, snow storage, surplus, and runoff.
The model is obtained from this web page using the Download link below.
Full model documentation, including both a description of the physical process modeling methodology and the graphical user interface can be accessed from the links below. Also, a demonstration input data file (necessary to run the model) is available with the model download.
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Thornthwaite Monthly Water Balance Model