I have a question when you download your LULC area/map how did you get the biophysical table of your study area?, because I did it from USGS and the ESA websites as recommended, but I only got the TIFF file but no CSV files related.
Usually you have to create the biophysical table yourself, it is not provided. Biophysical parameters in the table are found by searching the scientific literature and/or consulting with experts. The Urban Flood model biophysical table contains curve numbers for each soil group. Please see the guidance on finding this data: Data Sources — InVEST documentation