How to configure bottom boundary flow to vary over time (Water Overlay)

When working with the full groundwater model of the Water Overlay, ground bottom flow from deeper ground layers through the bottom boundary may present a significant factor in the ground water balance. However, especially over longer times, the effects of external bottom flow can vary. For these situations, it is possible to introduce a time-dependant variation to ground bottom pressure.

For bottom flow to be functional, the following should be prepared beforehand:

• The Bottom pressure and Bottom resistance overlays based on GeoTIFFs.
• A csv with a start-time time sequence for the ground bottom pressure, in meters.

Editor → Current Situation (Ribbon tab) → Overlays (Ribbon bar) → Water Overlay (Left panel) → Configuration Wizard (Right panel) → Bottom boundary

How to configure variable bottom boundary flow:

1. Open the Water Overlay Wizard, and proceed to the bottom boundary step.
2. Opt to configure bottom head pressure and resistance.
3. For the pressure GeoTIFF, import your GeoTIFF Overlay with head pressure values.
4. Ensure the uploaded GeoTIFF is selected in the dropdown.
5. For the resistance GeoTIFF, import your GeoTIFF Overlay with resistance values.
6. Ensure the uploaded GeoTIFF is selected in the dropdown.
7. Set the Global pressure to "dynamic", and opt to select a csv.
8. Import the prepared csv.
9. Close the import window.
10. Close the configuration wizard, and recalculate the Overlay.

How-to's

• How to import a time sequence with a CSV
• How to configure constant bottom boundary flow (Water Overlay)

See also

• Bottom pressure prequel (Water Overlay)
• Bottom resistance prequel (Water Overlay)