How to add Subsidence (Water Overlay)

This functionality is currently unavailable or non-functional.
Tygron is looking at scheduling the restoration of Water Overlay subsidence on its roadmap.

For the calculation of the effects of a severe rainfall, effects of subsidence can be included, such as the recalculated water levels and the changed ground levels. For now, ground water levels affected by the subsidence are not included.

How to include subsidence:

1. Add the Subsidence Overlay. Take note of when to use and how to configure the subsidence overlay.
2. In the right panel, select the "Keys" tab
3. Select the "Area attribute: output level (m)". Choose a new attribute, for example the WATER_LEVEL_OUTPUT attribute, to write the new water levels to.
4. In the Rainfall overlay in the right panel, select the "Keys" tab.
5. Choose the overlay for the subsidence model you want to use in the "Include Subsidence" form.
6. Also select the newly created attribute containing the water levels in the "Area Attribute: Water Level (m)" form.
7. Go to the "General" tab and recalculate the grid.

• Subsidence attribute.JPG

  Create a new attribute containing the recalculated water levels.

• Include subsidence.JPG

  Include the subsidence overlay and select the new water level attribute.

Notes

• Take care not to set the WATER_LEVEL_OUTPUT Overlay Key of the Subsidence Overlay to the same Attribute as the WATER_LEVEL used as the input for the Subsidence Overlay itself. Otherwise, the calculation will repeatedly change its own input, leading to inconsistent results.
• By setting up two identical Water Overlays, one connected to the Subsidence Overlay and one not, it's possible to investigate in detail the effects of subsidence on the water system.

See also

• Water Overlay
• Subsidence Overlay

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