> 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/aquifers/aquifer.aqu/flo_max.md).

# bf\_max

This parameter determines the daily groundwater flow amount needed for all channels linked to an aquifer to receive groundwater flow. If groundwater flow < *flo\_max*, the channels with the smallest drainage areas will stop receiving groundwater flow. The amount of groundwater flow a channel receives depends on the channel length.

{% hint style="info" %}
This parameter is only active when the file [**aqu\_cha.lin**](/io-docs/introduction-1/connectivity/aqu_cha.lin.md) is used instead of [**aquifer.con**](/io-docs/introduction-1/connectivity/hru.con.md) to connect aquifers to channels.&#x20;
{% endhint %}