Data identifer: BERG [m] (only for horizontal or 3D models)

This attribute is required to calculate the influence of subsidence on the upper and lower boundaries, the thickness of the aquifer, watercourse systems, and on ground surface elevations. These data types are taken into account automatically. Therefore, when entering these values, the elevation values must be entered in relation to the reference time of the subsidence. At locations in the model where no subsidence occurs, the nodes must be assigned a value of 0.0 (unit m).

Subsidence also has a particular impact on surface watercourse system conditions. For example, an exfiltrating body of water (receiving water) can cut deeper into the aquifer as a result of subsidence, which increases the groundwater contribution to the watercourse..

Influence of subsidence on an exfiltrating watercourse

On the other hand, subsidence can cause the previously exfiltrating watercourse to lose its gradient/channel and thus no longer fulfil its drainage function. Which results in the waterlogging of the ground surface.

It is also possible for a previously infiltrating body of water to cut into the aquifer due to subsidence and for the infiltration process to be reversed to an exfiltration process.

: Influence of subsidence on an infiltrating watercourse