Just wait until it starts soaking the wrong person and opening the door on them trying to clear up thus exposing them to all & sundry. Still, might be money in it for the solicitors.
Aside from the Victorian prurience of the council in dreaming up this nonsense, the practicalities are clearly fraught with dangers.
I would suggest that the last thing an epileptic visitor who succumbs to a fit needs, is to be sprayed with water because his tremors have mimicked inappropriate behaviour.