victorzamora
Contributor
I have no direct experience, i just thought the water is mostly not moving there. My mistake..
In general terms, almost all US caves have flow. Some have very little, but all the ones I can think of have SOME. Some have enough flow to be pretty uncomfortable.....like some caves literally can't be entered when the flow is up and others literally require ski ropes to pull yourself in.
It's not constant, either, axially or radially (for lack of better terms). So there are a few options for drift compensation, but it certainly adds to the cost and complexity....and most will add to the post-processing necessary.