Id be happy if they would start by using fire hoses!!, but your idea sounds darn good, too!!
On the news today showing the Chinese local government crackdown on protestors in Hong Kong, they showed numerous police vans equipped with high pressure water hoses to repel demonstrators. Huge vans marked "Police". Chinese are getting the job done repelling demonstrators, and are laughing at our weak enforcement against protesters. I've wondered why we aren't using high pressure water hoses?