Pamphlets on Conservation of Natural Resources, Volumen18U.S. Government Printing Office, 1909 |
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Página 239
... flood and drought and may be plagued with problems of pollution . The country , taken as a whole , is blessed by an average annual rainfall of somewhat more than 30 inches . But this precipitation is not evenly distributed . Generally ...
... flood and drought and may be plagued with problems of pollution . The country , taken as a whole , is blessed by an average annual rainfall of somewhat more than 30 inches . But this precipitation is not evenly distributed . Generally ...
Página 241
... flood . The crucial importance of vegetative cover in diminishing floods is made clear by the fact that during heavy precipitation the amounts of runoff and soil loss are anywhere from 50 to 150 times greater on exposed land than on ...
... flood . The crucial importance of vegetative cover in diminishing floods is made clear by the fact that during heavy precipitation the amounts of runoff and soil loss are anywhere from 50 to 150 times greater on exposed land than on ...
Página 242
... floods is to construct big dams behind which flood waters can be stored in the storm season , and released when the danger has passed . Dams not only protect cities and farms downstream , they also help ensure the relatively even flow ...
... floods is to construct big dams behind which flood waters can be stored in the storm season , and released when the danger has passed . Dams not only protect cities and farms downstream , they also help ensure the relatively even flow ...
Página 246
... flood peaks . See chapters 2-3 . Harold E. Thomas . The Conservation of Ground Water . New York , McGraw - Hill , 1951. 327 pp . A thorough survey of the ground - water situation and a discussion of natural and legal factors connected ...
... flood peaks . See chapters 2-3 . Harold E. Thomas . The Conservation of Ground Water . New York , McGraw - Hill , 1951. 327 pp . A thorough survey of the ground - water situation and a discussion of natural and legal factors connected ...
Página 247
... flood plain , the greater becomes the value of its development , and consequently the greater the insurance risk against unusual floods . This will surely raise an issue of who should share , in what proportion , the cost of protection ...
... flood plain , the greater becomes the value of its development , and consequently the greater the insurance risk against unusual floods . This will surely raise an issue of who should share , in what proportion , the cost of protection ...
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Términos y frases comunes
acres agencies Agriculture annual areas bill boys Bureau CAGNEY camp Chairman Civilian Conservation Corps Commission committee Congress conservation movement Construction cooperation coordination cost Council delinquency Department Douglas-fir economic enrollees existing facilities Federal Government fire Forest Fire forest land FOREST PROTECTION Forest Service forestry Gifford Pinchot Governor habitat important improvements increase industry Insect and Disease interest Interior January 26 juvenile Kalamazoo River labor legislation Maintenance Management and administration ment miles million acres mineral national forests national-forest natural resources organization parks percent plans planting population present President problems production proposed recommendations recreation Reforestation regional resource development Resource Management Resources and Conservation responsibility river roads and trails Senator CLARK Senator Humphrey SENATOR MURRAY Senator RANDOLPH Silviculture statement streams surveys Theodore Roosevelt Timber purchasers tion U.S. Senate United utilization Washington watershed welfare wildlife young Youth Conservation Corps