Hi, I am currently using InVEST SDR to estimate the sediment export of some watersheds in France. I am using a 25 meters mesh and a 100 meters mesh. The results are pretty close between these two meshes but I overestimate my validation data by 10 each time. I have compared InVEST SDR with a manual…

Hi @TheoMzr , Welcome to the forum and thanks for writing in about your experience with SDR results. Is the model overestimating your validation data by 10 times? Recently, one of our hydrologists ( @RafaSchmitt ) began investigating a potential issue with the LS-factor cap in this model. It is curr…

Hi I also have this problem, The SDR value is close to real data observed in hydrometric station but the erosion which resulted from USLE method is overestimated (almost 5 times higher than real). The main reason is high value of calculated LS by the model and there is no way to introduce the LS ra…

hi I reduce the L max value to 1 and also threshold _ flow_ accumulation to 50, it looks suitable for estimation both SDR and USLE in my watershed!!! ,. Is it right and acceptable??

HI @hilu202 - I don’t know much about changing the Lmax value, but I suspect that a value of 1 is unrealistically low, since the User Guide says “Its default value is 122 but reasonable values in literature place it anywhere between 122-333 see Desmet and Govers, 1996 and Renard et al., 1997.” And…

Hi @swolny The mentioned watershed has a lot of steep slopes. You are right it is better to calibrate TFA according to real streams. However in this case other parameters of USLE is correct according to literatures but the LS parameters is high and it reduces by changing the L max. As the model res…

InVEST SDR sediment export overestimation

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InVEST SDR sediment export overestimation

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