> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/introduction-1/basin-1/codes.bsn/abstr_init.md).

# gampt

| Code | Option       |
| ---- | ------------ |
| 0    | Curve Number |
| 1    | Green & Ampt |