kopecky

Dear Magda, I would follow the path recommended by Volker. If you want "wordier" description of this path, you can read it here: https://www.researchgate.net/publication/346004523_Topographic_Wetness_Index_calculation_guidelines_based_on_measured_soil_moisture_and_plant_species_composition Best regards, martin

Dear all SAGA users, Since I often see questions about the various ways how to calculate Topographic Wetness Index (TWI) in SAGA, I think it would be interesting to link you to recently published paper about various methods for TWI calculation in SAGA and their comparison with measured field data (https://doi.org/10.1016/j.scitotenv.2020.143785). Unfortunately, the paper is behind the paywall, but you can find almost identical version here (https://www.researchgate.net/publication/346004523_Topographic_Wetness_Index_calculation_guidelines_based_on_measured_soil_moisture_and_plant_species_composition)....

Dear Kyle, Thanks for your kind words. As already suggested by Volker, I would not use "Linear Flow Threshold" during calculation of TWI. In my experience, using "Linear Flow Threshold" decrease ability of resulting TWI to approximate soil moisture and to explain plant species distribution. On the other hand, it is a good option when you want to have sharply delimeted flow channels (which is desirable in some hydrological applications). Best regards, martin kopecky

Flow routing

Hi Tumisho, There is no "right" way how to calculate TWI - the "best" approach can...