How to add Subsidence (Water Overlay): Difference between revisions

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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.
Include subsidence effects in [[Water Overlay]] calculations by precomputing the [[Elevation model]] with a [[Combo Overlay]] and setting it as the [[Terrain elevation prequel (Water Overlay)|terrain elevation prequel]].


{{Editor steps|title=include subsidence|Add the [[Subsidence Overlay]]. Take note of when to use and how to configure the subsidence overlay.|In the [[right panel]], select the "Keys" tab|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. |In the Rainfall overlay in the [[right panel]], select the "Keys" tab.|Choose the overlay for the subsidence model you want to use in the "Include Subsidence" form.|Also select the newly created attribute containing the water levels in the "Area Attribute: Water Level (m)" form.|Go to the "General" tab and recalculate the grid.}}
{{editor steps|title=add subsidence to a water simulation
 
| Add and configure a [[Subsidence Overlay]] (or other source which defines amounts of subsidence).
 
| Add a [[Heightmap Overlay]], set to DTM mode.
<gallery mode="nolines">
| Add a [[Combo Overlay]], which takes the values of the [[Heightmap Overlay]] and subtracts the value of the final result of the [[Subsidence Overlay]].
File:Subsidence_attribute.JPG|Create a new attribute containing the recalculated water levels.
| Open the [[Water Overlay]]'s [[Water Overlay Wizard|configuration wizard]], and proceed to the step regarding the Elevation Model.
File:Include_subsidence.JPG|Include the subsidence overlay and select the new water level attribute.
| Opt to select a [[Grid Overlay]] to determine the [[Elevation model (Water Overlay)|elevation model]].
</gallery>
| Select the [[Combo Overlay]].
| Recalculate the [[water Overlay]].
| The calculation has now taken into account the specified subsidence effects.
}}


{{article end
{{article end
| 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.
| notes=
* By setting up two identical [[Water Overlay]]s, one connected to the [[Subsidence Overlay]] and one not, it's possible to investigate in detail the effects of subsidence on the water system.
* The source of Subsidence can be a [[Subsidence Overlay]], but could also be a precomputed result from a [[GeoTiff Overlay]] or another [[Combo Overlay]].
* The [[terrain elevation prequel (Water Overlay)|terrain elevation prequel]] excludes [[Building]]s; these are added automatically to the terrain elevation, regardless of whether it uses the [[DTM]] or a [[Prequel]].
* Compare two identical [[Water Overlay]]s—one with [[Subsidence Overlay|Subsidence]] and one without—to analyze its effects on the water system.
| seealso=* [[Water Overlay]]
| seealso=* [[Water Overlay]]
* [[Subsidence Overlay]]
* [[Subsidence Overlay]]
* [[Combo Overlay]]
* [[Terrain elevation prequel (Water Overlay)]]
}}
}}


{{Overlay nav}}
{{Overlay nav}}
{{Water Module buttons}}
[[Category:How-to's]]

Latest revision as of 11:32, 8 July 2026

Include subsidence effects in Water Overlay calculations by precomputing the Elevation model with a Combo Overlay and setting it as the terrain elevation prequel.

How to add subsidence to a water simulation:
  1. Add and configure a Subsidence Overlay (or other source which defines amounts of subsidence).
  2. Add a Heightmap Overlay, set to DTM mode.
  3. Add a Combo Overlay, which takes the values of the Heightmap Overlay and subtracts the value of the final result of the Subsidence Overlay.
  4. Open the Water Overlay's configuration wizard, and proceed to the step regarding the Elevation Model.
  5. Opt to select a Grid Overlay to determine the elevation model.
  6. Select the Combo Overlay.
  7. Recalculate the water Overlay.
  8. The calculation has now taken into account the specified subsidence effects.

Notes

See also

Overlays
Categorization
Grid • Overlay Type • Parent • Result Child • Result Parent • Result type • Key
Default
City
Administrative
Ownership • Ownership Grid • Zipcodes • Zoning • Neighborhoods • Municipalities • Scenario
Environmental
Heat Stress • Shadow • Traffic Density • Traffic Noise • Traffic NO2 • Livability
Water
Rainfall • Flooding • Groundwater • Watershed
Grid Calculation
Average • Combo • Distance • Sight Distance • Travel Distance • Inference • Iteration
Geo Data
GeoTIFF • WCS • WMS • Image • Area • Attribute • Function
Topography
Satellite • Digital Surface Model • Digital Terrain Model • Building Floors • Underground • Source
Network
Network Distance • Network Overview • Network Ownership
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