. Bulletin. Forests and forestry -- United States. FALLEN RAIN. 71 When rain falls over mountains which have so been deprived of their natural protection it is no long'er cauo-ht and held back bv the trees and the forest floor. The roots, which were once the strongest means of l)inding the soil together, now are gone and leave it without protection against the rushing water. Heavv rains or sudden thaws swell the streams with. Fig. 46.—Masonry dams built to control a torrent. Students of the French forest school at the right. Alps of southern France. marvelous quickness, and give them a wonderf
. Bulletin. Forests and forestry -- United States. FALLEN RAIN. 71 When rain falls over mountains which have so been deprived of their natural protection it is no long'er cauo-ht and held back bv the trees and the forest floor. The roots, which were once the strongest means of l)inding the soil together, now are gone and leave it without protection against the rushing water. Heavv rains or sudden thaws swell the streams with. Fig. 46.—Masonry dams built to control a torrent. Students of the French forest school at the right. Alps of southern France. marvelous quickness, and give them a wonderful power to cut away their banks. Where the waterway is very steep such a flood often carries with it many times its own weight of earth and stones. As it nears the val- ley it breaks from its bed and makes new channels, or spreads over the lowlands. The current loses its swift- ness, and its load of stones and sterile earth sinks to. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Division of Forestry. Washington : G. P. O.
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