# rchg\_dp

This parameter defines the fraction of root zone percolation reaching a deeper aquifer. If a deep aquifer is defined in **aquifer.aqu** and [**aquifer.con**](https://swatplus.gitbook.io/io-docs/introduction-1/aquifers/aquifer.aqu), its groundwater flow can be routed to any other spatial object using [**aquifer.con**](https://swatplus.gitbook.io/io-docs/introduction-1/aquifers/aquifer.aqu). If no deeper aquifer is defined, the water that recharges the deeper aquifer is assumed to be lost from the watershed.