Lack of feedback for waterfall swim prevention

[0ffz]

Many are confused about the downward velocity applied when swimming up a waterfall. It would be helpful to add particles that make it clear an action is happening and this is intended.

Additionally, it is easy to bypass by swimming up the edge of a water stream, and may be applied in waters that are too shallow, and lastly it is too easily bypassed as it doesn't fully stop swimming upwards.