> 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/rte_cha.md).

# rte\_cha

There are two channel water routing methods available in SWAT+:

| Code | Option                  |
| ---- | ----------------------- |
| 0    | Variable Storage method |
| 1    | Muskingum method        |

{% hint style="info" %}
The user must be careful to define [msk\_co1](/io-docs/introduction-1/basin-1/parameters.bsn/msk_co1.md), [msk\_co2](/io-docs/introduction-1/basin-1/parameters.bsn/msk_co2.md) and [msk\_x](/io-docs/introduction-1/basin-1/parameters.bsn/msk_x.md) in [**parameters.bsn**](/io-docs/introduction-1/basin-1/parameters.bsn.md) when the Muskingum method is chosen.
{% endhint %}