It's been around since my childhood, so I don't know the plan. It is a mechanism devised to handle snow even in the city where there is no place to throw away heavy snow. The water source draws water from the river using a pump. Run water for a certain amount of time on each street.
@@KunihikoKubota In the USA the open holes by opening the grates on the side of the road would be a liability if a car slid into the hole or if someone fell into it the hole. The USA is lawsuit crazy over anything for any reason.
