This calculation is one of scores of graphs and formula in "Controling Blowing and Drifting Snow with Snow Fences" This is my most popular snow-related piece, which first ran in 2016. Today’s very fine snowstorm over the whole Northeast means it’s time for a rerun! I have a fairly long driveway next to an open field, and at least once every winter, snow drifts across it to the point where things get dicey without all-wheel drive. For two decades, I have talked about setting up a snow fence to keep out the drifts, but I’ve never gotten around to it. Which is a good thing, because I would have done it exactly wrong.