I need a hole in Landscape for waterwell

I am trying to make a hole in my Landscape for installing a water well. I want to do it using custom depth but I can’t find any tutorials that use a landscape and my attempts have failed. Is there a way to do it?

Do you want to do it dynamic, as in during gameplay someone creates a waterwell, or is it offline during level production?

There are techniques to create holes into meshes using custom depth, but they require the mesh material to be able to become invisible (translucent, masked) which is expensive and I would not recommend it for the landscape material.

Looks good but in my opinion absolutely unusable in games.

There a standard method for making holes in landscape:

No, I just want a permanent water well in my level. If I don’t use custom depth is visibility in landscape tools the only way?