Can we assume you know what a snow fence looks like? Anything designed and built to stop the flow of blown snow. Usually installed near deep cuts in the ground that fills I with drifted snow. The fence slows the wind blown snow down so it drops out, builds up on the area outside the cut. Usually there are wood, A frame structures with horizontal wood slats. I have never measured one but suppose they are about 6' high and about 10'long. Groups of them are spaced as needed.