Water splash effects continue with vehicle stopped

If a river is flowing (gently) the water splash effects will continue even when the vehicle is stopped. Once the vehicle starts moving with the current the splashing stops. It looks like the game is taking into account the difference between vehicle and current speed, but it's too sensitive and low speed differences should generate less splashing.

 

I get that, but my point was for the low-velocity river & vehicle collision the water particles seem too much. It would be better to tone them down at low speeds.