> 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/crack.md).

# crack

| Code | Option                            |
| ---- | --------------------------------- |
| 0    | Do not compute crack flow in soil |
| 1    | Compute crack flow in soil        |

If crack = 1, the crack volume potential is controlled by [perc\_crk](/io-docs/introduction-1/soils/soils.sol/perc_crk.md) in [**soils.sol**](/io-docs/introduction-1/soils/soils.sol.md).