A rather rough check of the author's analysis was made by the double‐mass technique. The double‐mass curve of the observed runoff of White River against water content of snow cover in White River basin plotted as a straight line, thereby indicating no change during the period, A similar line for Elk River data broke at about 1946 or 1947, the points for the years 1947 to 1951 falling on a line indicating less runoff in proportion to water content.