# 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 %}


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