Vertically resolved profiles of the mean downslope flow velocity of snow have been measured on the snow chute of the SLF at Weissfluhjoch during winter 2003/04. We used correlation of reflexivity measurements at the side walls and at the centerline of the chute. Several possible physical scenarios describing the snow flow lead to different models with different degrees of freedom. Bayesian model comparison has been used to answer the question which of the physical models is most likely in the light of the available data.