To the best of my knowledge, you must be talking about the Greedy Brothers Treasure Excursion on Lake Silver that existed only in the 1984 season. The water cannons you speak of would probably be the ones placed around the Splash Harbor/Geyser Gulch area, I'm guessing. They possibly are left over from Greedy Brothers. Maybe were placed closer to the shore by the kiddie attractions. I was on park as recently as late June, and they randomly were going off then. If you are talking about water cannons in the middle of the lake left over from Greedy Brothers, I don't know what's going on there. Anyone with more input? Anyone been to the park and noticed this in the last few weeks?