This is NOT how you should use Phoenix FD but I've wanted to make something like this for years now, and have finally gotten around to do it. Was much harder than I expected, had to simulate quite a few times, so having a side workstation to do crunch while you do other stuff is a blessing. I guess exercises like these teach me patience and perseverance. :)
Anyway, there's a lot that could be done to make it even better - like, small splashes, a paper boat or a rubber duck but I'll leave that for some other time. Check the video link for FullHD 30fps video with sound.
Phoenix FD rain on water looped
Looped Rain PhoenixFD