Well, Hawaii's trying to get it right this time.
“The Rain Follows the Forest- Hahai nō ka ua i ka ululāʻau” is the state's watershed development and protection plan. As of 2012, they're trying to double the amount of protected watershed areas over 10 years.
The name sounds goofy, but what they're talking about is the fact that the islands' water supply is dependent on a healthy rainforest. So, they don't literally think that rain comes just because the forest is there, but they know that a forest is needed to trap water and make a watershed. They're removing non-native plants and animals, fencing replanted areas so they have a chance to grow, and more. So, I guess they took the wrong science and are applying just the name to some good science and preservation. http://dlnr.hawaii.gov/rain/