# 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](https://swatplus.gitbook.io/io-docs/introduction-1/basin-1/parameters.bsn/msk_co1), [msk\_co2](https://swatplus.gitbook.io/io-docs/introduction-1/basin-1/parameters.bsn/msk_co2) and [msk\_x](https://swatplus.gitbook.io/io-docs/introduction-1/basin-1/parameters.bsn/msk_x) in [**parameters.bsn**](https://swatplus.gitbook.io/io-docs/introduction-1/basin-1/parameters.bsn) when the Muskingum method is chosen.
{% endhint %}