# Aquifers

There are two files that are used to define the aquifer properties:

* General aquifer properties: [**aquifer.aqu**](https://swatplus.gitbook.io/io-docs/introduction-1/aquifers/aquifer.aqu)
* Aquifer initialization: [**initial.aqu**](https://swatplus.gitbook.io/io-docs/introduction-1/aquifers/initial.aqu)