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Objects and Methods : Groundwater Storage : User Methods : Groundwater Evapotranspiration
Groundwater Evapotranspiration
This category contains three methods: None, Input ET Rate, and Elevation ET Table.
* None
This is the default method. It performs no calculations, and Evapotranspiration is assumed to be zero.
There are no slots specific to this method.
* Input ET Rate
The Input ET Rate method allows you to input the ET rate. This value is converted to a volume based on the Riparian Area and the timestep length. The volume of ET is used to compute storage.
Slots Specific to This Method
 ET Rate
Type: Series Slot
Units: velocity
Description: The evapotranspiration rate in units of velocity
Information: Used to compute the evapotranspiration volume. The ET volume is used to compute storage via the mass balance equation.
I/O: Required input
 ET Volume
Type: Series Slot
Units: volume
Description: The ET Rate multiplied by the Riparian Area and the timestep length
Information: Used to compute storage
I/O: Generally output; if input, it overrides the value computed using the ET Rate
 Riparian Area
Type: Series Slot
Units: AREA
Description: The horizontal area of the riparian zone
Information: Used to compute ET Volume
I/O: Required input
* Input ET Volume
The Input ET Volume method allows you to input the ET Volume. The volume of ET is used to compute storage.
Slots Specific to This Method
 ET Volume
Type: Series Slot
Units: volume
Description: The volume of water lost from the groundwater object through riparian evapotranspiration
Information: Used to compute storage
I/O: Input only
* Elevation ET Table
The Elevation ET Table method computes evapotranspiration given the relationship between groundwater elevation and ET rate. The ET rate found in the Elevation ET Table is multiplied by the Riparian Area to get the ET Volume.
Slots Specific to This Method
 Elevation ET Table
Type: Table Slot
Units: length vs velocity
Description: A table relating water table elevation to ET rate
Information: The ET rate is determined based on the beginning of timestep (previous) elevation value. The ET rate is then multiplied by the Riparian Area and timestep length to compute the ET Volume.
I/O: Required input
 ET Volume
Type: Series Slot
Units: volume
Description: The ET Rate multiplied by the Riparian Area and the timestep length
Information: Used to compute storage
I/O: Output; if input, it overrides the value computed from the Elevation ET Table
 Riparian Area
Type: Series Slot
Units: AREA
Description: The horizontal area of the riparian zone
Information: Used to compute ET Volume
I/O: Required input
Revised: 07/09/2023