Southern Appalachian Digital Collections

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Secretary of Agriculture report on watersheds

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  • 16 APPALACHIAN AND WHITE MOUNTAIN WATERSHEDS. coggin are centered at Berlin, N. H., and Rumford Falls, Livermore Falls, Lewiston, and Brunswick, Me. In the 167 miles between tide , water and Umbagog Lake there is a fall of 1,235 feet, of which 610 feet is used, corresponding to about 120,000 net horsepower. Of the remaining 625 feet, possibly two-thirds can be utilized, corresponding to 60,000 net horsepower, and bringing the total to about 180,000 horsepower, or approximately three times that of the Merrimac without its tributaries. The streams of the White Mountains, therefore, furnish power for great industries, and are the basis of development for many prosperous cities in all the New England States but one. These streams are all influenced vitally in flow by the forest which covers the slopes of the White Mountains. APPALACHIAN MOUNTAINS IMPORTANT TO NAVIGATION. Timber supply and water power are not the only factors which make the Appalachian Mountains commercially important. All the water gathered by the Southern Appalachian and White Mountains flows to the sea through navigable rivers. With greater elevation than other parts of the watersheds the mountains receive much more rainfall, and with their cooler climate the evaporation is less; hence there is more water to be discharged. Because of the precipitous slopes of the mountains the run-off is far more rapid than in other sections. To this must be added the fact that in the Southern Appalachians there are no natural lakes to gather the flood waters and equalize the flow of streams. There are thus two powerful influences contributing to an extremely heavy discharge from these mountains, and two more contributing to an extremely rapid run-off. Combined, these tend to produce great variability in the flow of all streams which have a large part of their watersheds in the mountains. A large regular discharge coming from springs is desirable, a variable surface run-off is bad from every point of view, and so far as possible should be remedied. The variability of the present flow of Southern Appalachian streams is so great that though the average volume would make the streams constantly navigable, they are at extreme flood during a few weeks of the year and at extreme low water during a much longer period. Their low-water stage causes interference and loss to business through the cessation of navigation; their high- water stage often entails damage and loss from floods. There is but one natural factor which tends to equalize the flow of Southern Appalachian streams—the forest. In one continuous mantle, covering ridges, slopes, and coves, it has for untold ages been nature's sole reliance for the proper distribution of rainfall. If storm and deluge came, the downpour fell upon a foot-deep layer of humus, which readily received many times its own weight of water before it allowed any to escape. When filled, it passed on the excess to a soil made porous by myriads of penetrating roots and countless tons of vegetable mold. If drought came, it found the humus and soil filled as a reservoir with water for the steady supply of springs and streams through weeks or months of rainless weather. The original forest, then, with its characteristic conditions of shade, undergrowth, humus, and soil, was an effectual distributer of moisture.
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Object’s are ‘parent’ level descriptions to ‘children’ items, (e.g. a book with pages).