> 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/wetlands/hydrology.wet.md).

# hydrology.wet

This file contains the wetland hydrology parameters.

| Field                                                                          | Description                                                                       |  Type  |   Unit   | Default | Range |
| ------------------------------------------------------------------------------ | --------------------------------------------------------------------------------- | :----: | :------: | :-----: | :---: |
| [name](/io-docs/introduction-1/wetlands/hydrology.wet/name.md)                 | Name of the wetland hydrology record                                              | string |    n/a   |   n/a   |  n/a  |
| [hru\_ps](/io-docs/introduction-1/wetlands/hydrology.wet/hru_ps.md)            | Fraction of HRU area at principal spillway (when surface inlet riser flow starts) |  real  |   frac   |    0    |       |
| [dp\_ps](/io-docs/introduction-1/wetlands/hydrology.wet/dp_ps.md)              | Average depth of water at principal spillway                                      |  real  |    mm    |    0    |       |
| [hru\_es](/io-docs/introduction-1/wetlands/hydrology.wet/hru_es.md)            | Fraction of HRU area at emergency spillway (when starts to spill into ditch)      |  real  |   frac   |    0    |       |
| [dp\_es](/io-docs/introduction-1/wetlands/hydrology.wet/dp_es.md)              | Average depth of water at emergency spillway                                      |  real  |    mm    |    0    |       |
| [k](/io-docs/introduction-1/reservoirs/hydrology.res/k.md)                     | Hydraulic conductivity of the wetland bottom                                      |  real  |   mm/hr  |   0.01  |       |
| [evap](/io-docs/introduction-1/wetlands/hydrology.wet/evap.md)                 | Wetland evaporation coefficient                                                   |  real  |    n/a   |   0.70  |       |
| [vol\_area\_co](/io-docs/introduction-1/wetlands/hydrology.wet/vol_area_co.md) | Volume surface area coefficient for HRU impoundment                               |  real  |    n/a   |   1.0   |       |
| [vol\_dp\_a](/io-docs/introduction-1/wetlands/hydrology.wet/vol_dp_a.md)       | Volume depth coefficient for HRU impoundment                                      |  real  |    n/a   |   1.0   |       |
| [vol\_dp\_b](/io-docs/introduction-1/wetlands/hydrology.wet/vol_dp_b.md)       | Volume depth coefficient for HRU impoundment                                      |  real  |    n/a   |   1.0   |       |
| [hru\_frac](/io-docs/introduction-1/wetlands/hydrology.wet/hru_frac.md)        | Fraction of HRU that drains into wetland                                          |  real  | fraction |   0.5   |       |