I have heard of this being done before in farming communities. Maybe not with this same technology, but I’m sure that I’ve heard of it, and have wondered why aren’t more communities doing it in drought situations.
Cloud seeding.
Seeding is unpredictable. However, if it works as well as this story seems to suggest, I can see communities doing this. It could be the answer to drought in the Mid-West.
Traditionally silver iodide is used, IIRC.