How can coincidental contact surfaces in Leapfrog Hydrogeology be layered without generating duplicate layers above the contact?

Hi Team,

I have a technical question regarding layering behaviour in Leapfrog when using the Hydrogeology Extension.

In my geological model, I have two surfaces that are in coincidental contact. When I define layer guides and specify the number of layers, Leapfrog creates the expected layers below the coincidental contact. However, it also generates the same number of layers above the contact, effectively pushing the overlying layers upward and creating geometry that does not reflect the intended stratigraphy.

Currently, my workaround is to manually adjust the elevations in FEFLOW by assigning the coincidental contact as a fixed surface and pushing the affected layers downward. While this achieves the desired result, it is time-consuming and can become difficult to manage when model revisions are required.

Has anyone encountered this issue before? Is there a recommended workflow in Leapfrog to handle coincidental contacts and layer guides more effectively? For example:

• Is there a way to constrain layering to only one side of the coincidental contact?
• Are there specific stratigraphic or hydrogeology settings that prevent the upward propagation of layers?
• Is there a better modelling approach that avoids the need for manual corrections in FEFLOW?

I suspect there may be a more efficient solution within Leapfrog, and I would appreciate any suggestions or best practices.

Thanks

Avadhoot Date