Abstract In an experiment of a model snowdrift formed behind each of two model snow fences, which are the same in shape but different in size, the independence of the wind speed ratio between them from their length ratio was observed. This phenomenon can be explained not by the Froude number, but by the effect of wakes behind an obstruction and movement characteristics of snow particles. The wind speed ratio and the duration of a storm in which the model snowdrifts of glass beads and activated clay particles become similar to each other, were examined. It follows from the result that the friction speed ratio is equal to the ratio of the threshold friction speed of both model snow particles, and the ratio of storm duration can be calculated by comparing the volume of both model snowdrifts. This result suggests strongly that the same relationships hold between the model and the prototype snowdrift.