. Biology; the story of living things. CONSERVATION AND ITS MEANING 591 It has been estimated that the transporting power of water varies as the sixth power of its velocity. This means the carrying power of water is increased sixty-four times if its rate of flow is doubled. From such figures it is easy to account for the enormous destruction by streams at a time of flood, as was witnessed in March, 1936, in the eastern part of the United States. The annual damage by "spring freshets" in cut-over areas in the East, the recent floods in the Ohio and Mississippi valleys, where the fores
. Biology; the story of living things. CONSERVATION AND ITS MEANING 591 It has been estimated that the transporting power of water varies as the sixth power of its velocity. This means the carrying power of water is increased sixty-four times if its rate of flow is doubled. From such figures it is easy to account for the enormous destruction by streams at a time of flood, as was witnessed in March, 1936, in the eastern part of the United States. The annual damage by "spring freshets" in cut-over areas in the East, the recent floods in the Ohio and Mississippi valleys, where the forest cover has given place to farms and cities, and the damage done by cloudbursts in denuded areas in the Southwest, all testify to the power of uncontrolled water and show the need of forest cover to hold back flood Erosion areas in the United States. 1, Area of most serious erosion : 2, harmful erosion widespread ; 3. fiat areas, slight erosion ; 4, erosion generally not serious; 5, much serious wind erosion ; 6. much erosion from over-grazing. But erosion does damage in a more insidious way than through spectacular floods. A plowed area on a hillside allows more rain to run off than a similarly located area covered with grass. A plowed field allows more soil to be carried off by wind than does a similar field covered with grass. A plowed field will be left covered with mud after a heavy rain and the pores of soil will be found to be clogged with soft mud, making plant growth practically impossible. A glance at the map shows the very large area in this country in which more or less serious erosion takes place. A check-up with the map showing forest areas on page 605 makes clear that the areas of. 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 Hunter, George W. (George William), 1873-1948; Walter, H
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