We developed a micro-service able to run the Thornthwaite-Mather water balance that uses an accounting procedure to analyze the allocation of water among various components of the hydrologic system.

We recently pubished a paper; if you use the app please cite our work: Water Balance Computation: Comparison of Applications in Two European Watersheds. Hydrology 2021, 8, 34. https://doi.org/10.3390/hydrology8010034

You have to follow three main steps. For more details visit the Methods section where you can find also data example.