You don't see this very often—a 350-foot artificial waterfall pouring out of a skyscraper. It looks cool, but it also looks expensive. Gushing water isn't free: You not only have to get the H2O, but you need energy to bring it to the top of the building. This is why the building only runs this waterfall for short periods of time.
Since this real world example has some nice physics, it makes a great physics homework
Read Wired if you are curious.
Otherwise just watch this 108 meter fall in Guiyang, China