Rain filler and Floods.
As it rains your thirst will slowly go up. For the duration of rain your Dino’s thirst shall slowly go up. However the rain will only fill you up about half-way. This will help save players in a pinch and those no where near water. Another thing when it rains for a long time water levels will rise and start flooding. Flooding will restore ponds and rivers but they will take a while to cure.