> 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/qual2e.md).

# qual2e

| Code | Option                                                                          |
| ---- | ------------------------------------------------------------------------------- |
| 0    | Instream nutrient routing using QUAL2E                                          |
| 1    | Instream nutrient routing using QUAL2E with simplified nutrient transformations |