Nope, rocks used to cause affects on water flow but now its mostly visual, now they do have a effect in mud (Rocks) other models have a callout that dissables the collision with mud
Gotcha, on the flow. How about the impedance part, can an object be set to stop water, like some truck cabs. Think underwater tunnel.
not really, maybe reduce the push of the flow (i can cross fast rivers with a Uaz 469 blue if i block the water with another truck) but still kinda tries to roll my truck, i never tried with models, i think they dont affect the flow at all