Prerequisites: The ability to cast at least one water spell
You gain the ability to subtly control the water around you.
If it is raining, you can use an action to cause the rain to stop falling in a 4-meter radius cylinder centered on you. You can end this effect on your turn (no action required).
If there is water nearby, you can use an action each round to cause the water to flow up to 20 meters in a certain direction in a 20-meter radius sphere centered on you. The water flows in that direction until the end of your next turn.