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

Links: Usually not linked

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

Links: Not linkable

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

Links: Not linkable

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

Links: Not linkable

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

Links: Not linkable

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

Links: Not linkable

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

Links: Not linkable

Revised: 01/11/2023