> 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/rchg_dp.md).

# rchg\_dp

This parameter defines the fraction of root zone percolation reaching a deeper aquifer. If a deeper aquifer is defined in **aquifer.aqu** and [**aquifer.con**](/io-docs/introduction-1/connectivity/hru.con.md), its groundwater flow can be routed to any other spatial object using [**aquifer.con**](/io-docs/introduction-1/connectivity/hru.con.md). If no deeper aquifer is defined or if the receiving deeper aquifer is not connected to another spatial object, the water that recharges the deeper aquifer is assumed to be lost from the watershed.