 | Economics - 1915 - 936 pages
...hundred tons. It is a self-evident fact that water falling on steep lands tends to rapid runoff. The laws just cited show that erosion is tremendously increased...as an erosion-preventive factor are most important. Coincident with retarding erosion and runoff, forests also retain a considerable volume of moisture... | |
 | United States. Congress. House. Committee on Flood Control - Flood control - 1928 - 1034 pages
...sustain the self-evident fact that water falling on steep lands tends to run off rapidly. The laws just cited show that erosion is tremendously increased...erosion-preventive factor are most important. The presence of forest breaks the impact of rainfall and retards the hasty run-off in the following way... | |
 | Mississippi Forestry Commission - Forests and forestry - 1927 - 386 pages
...quickly poured 95% of its rainfall into the stream and went dry two months later." Sherman(S> writes: "The forest breaks the impact of rainfall and retards the hasty run-off in the following way: Its canopy of leaves or needles, with supporting twigs, branches and trunks, catches the first impact... | |
 | Boulder Dam Muscle Shouls - 1928 - 220 pages
...hundred tons. It is a self-evident fact that water falling on steep lands tends to rapid runoff. The laws just cited show that erosion is tremendously increased...as an erosion-preventive factor are most important. Coincident with retarding erosion and runoff, forests also retain a considerable volume of moisture... | |
 | American Academy of Political and Social Science - African Americans - 1928 - 274 pages
...hundred tons. It is a self-evident fact that water falling on steep lands tends to rapid runoff. The laws just cited show that erosion is tremendously increased...as an erosion-preventive factor are most important. Coincident with retarding erosion and runoff, forests also retain a considerable volume of moisture... | |
 | United States. Congress. House. Committee on Flood Control - Flood control - 1928 - 1042 pages
...sustain the self-evident fact that water falling on steep lands tends to run off rapidly. The laws just cited show that erosion is tremendously increased...that for any given type of soil the steepest lands »re most subject to erosion. Therefore it is upon steep, rough lands that forests as an erosion-preventive... | |
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... torrent of twenty miles an hour will carry boulders weighing one hundred tons. It is a self-evident fact that water falling on steep lands tends to rapid runoff. The laws just cited show that erosion is tremendously increased by rapidity of runoff.... 