> 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/structural-practices/filterstrip.str/cha_q.md).

# cha\_q

This parameter defines the fraction of the flow within the most concentrated 10% of the filter strip that is fully channelized. Flow that is fully channelized is not subject to filtering or infiltration effects.