They really ought to remove all water cannons from the park immediately, before a brawl breaks out.
If cost or resourcing are issues, I'm pretty sure I can assemble a pool of volunteers in short order to help with all of it. Just as a goodwill gesture while we all recover from difficult times. And also as a thank-you for removing all water cannons from the park immediately.
New idea. Just make the cannons random, but leave the machines. Put a disclaimer on them that paying only entitles you to press a button...As much as I dislike the water cannons, even I must admit that the idea of someone doing nothing all day but blasting people with them, probably getting incredibly good at it in the process, is completely hilarious.
...Provided that I'm not in one of the boats.
My idea behind only letting small kids hit the cannons is that they tend to be even more terrible with the timing than most adults are. Seems more fair that way. IMO the blasters should randomly soak the person at the button once or twice every ten shots, too.
My offer to volunteer remains open in perpetuity, secret BGW executive lurkers... PM me.