I know it’s winter when the water flow is cut off to the public fountains in Prospect Park; it doesn’t happened all at once, more like mail delivery, sometimes you are at the top of the run, sometimes at the bottom (although mail delivery isn’t want it used to be, in terms of being an EVENT, but you get the point) and Wednesday (Dec. 1) in the middle of a summer-like nor’easter, I see a park worker with a long-handled pipe wrench doing the job to the latest drinking fountain, at the interlocking paving stone entrance to what will eventually be the new ice skating rink, and now, or very shortly, you won’t be able to get a drink outdoors in Prospect Park, and I will know that it is winter.