I am having some problems with Nutrient Delivery Ratio model. The model ran without showing any error, however the “n_export” and “p_export” outputs have only NA values. Similarly, the attribute table of “watershed_results_ndr.shp” also has NA in all lines.
I checked the intermediate outputs and some of them seems OK (ie with values), such as “ndr_n” and “ndr_p”. However, “surface_load_p” and “runoff_proxy_index” have only NA values.
What must be the problem? Some tips?