Prequels (Subsidence Overlay)
Prequel overlays can be linked to the Subsidence Overlay to initiate particular parts of the model with more accuracy and detail.
| Name | Underlying data | Description |
|---|---|---|
| High ground water | Subsidence Prequel | Grid based high ground water levels |
| Low ground water | Subsidence Prequel | Grid based low ground water levels |
| Clay thickness | Subsidence Prequel | Grid based clay thickness |




