> For the complete documentation index, see [llms.txt](https://futurewater.gitbook.io/sphy-manual/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/manual/sphy-manual-3.1/appendix-3-soil-erosion-model-input.md).

# Appendix 3: Soil erosion model input

The most used soil erosion model is the MMF model. However, in SPHY other erosion models are also implemented. This appendix describes those erosion models and how to use them in SPHY.