# Wetlands

Wetlands are HRUs in which ponding of water on the surface is allowed. There are two files that are specific to wetlands:

* Main wetland file: [**wetland.wet**](/io-docs/introduction-1/wetlands/wetland.wet.md)
* Wetland hydrology: [**hydrology.wet**](/io-docs/introduction-1/wetlands/hydrology.wet.md)

For defining the remaining wetland properties, the following reservoir files are used: 

* Wetland initialization: [**initial.res**](/io-docs/introduction-1/reservoirs/initial.res.md)
* Wetland sediment: [**sediment.res**](/io-docs/introduction-1/reservoirs/sediment.res.md)
* Wetland nutrients: [**nutrients.res**](/io-docs/introduction-1/reservoirs/nutrients.res.md)
* Wetland release: [**res\_rel.dtl**](/io-docs/introduction-1/decision-tables/lum.dtl.md)


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