In our current game, we are contemplating to cast a wall of force into a canal that is set into a dungeon corridor, to block the flow of water (which is powering some turbine-like contrivances we want to turn off), by shutting off the entire corridor.
Can you cast the wall so it extends into the body of water? I‘m not sure if it can extend into water, due to line of effect, and other answers that state if there are objects in the way, those are causing holes in the wall. Water is not an object, but its also not empty space.