> For the complete documentation index, see [llms.txt](https://futurewater.gitbook.io/sphy-manual-3.0/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://futurewater.gitbook.io/sphy-manual-3.0/manual/sphy-manual/build-your-own-sphy-model/soil-erosion-model-input.md).

# Soil erosion model input

The soil erosion model needs input data for each of the landuse classes, as provided in the landuse map. The user needs to provide a PCRaster table file (\*.tbl), where each row represents a landuse class. The following data needs to be provided (with the numbers corresponding to the column numbers):

1. Landuse class
2. Plant height in m (PH)
3. Stem density in stems m-2 (NV)
4. Stem diameter in m (D)
5. Canopy cover, from 0 to 1 (CC), only in case canopy cover is not obtained from LAI
6. Ground cover, from 0 to 1 (GC)
7. No erosion flag, 0 or 1 (e.g. for urban and water landuse classes)
8. Tillage flag, 0 or 1
9. Manning in s m-1/3, is only used when the value is bigger than 0
10. No vegetation flag, 0 or 1, is used to switch off the roughness calculation for vegetation (Equation 67)

The model provides an optional table to provide changes in the landuse-specific soil erosion parameters after harvest of a crop. The following data needs to be provided (with the numbers corresponding to the column numbers):

1. Landuse class
2. Sowing date, as day of the year
3. Harvest date, as day of the year
4. Plant height in m (PH)
5. Stem density in stems m-2 (NV)
6. Stem diameter in m (D)
7. Canopy cover, from 0 to 1 (CC), only in case canopy cover is not obtained from LAI
8. Ground cover, from 0 to 1 (GC)
9. Tillage flag, 0 or 1