Topographic surveying; including geographic, exploratory, and military mapping, with hints on camping, emergency surgery, and photography . hile the slope of the bed remains great andthe velocity consequently great, the stream has a compara-tively straight channel. As the slope is reduced the courseof the stream becomes crooked and winding and its corrasiveagencies are diverted from its bottom to its sides. Therefore,swift streams flow in straight channels, sluggish streams incrooked channels. This operation is being performed notonly in the main stream, but in its numerous affluents to themin
Topographic surveying; including geographic, exploratory, and military mapping, with hints on camping, emergency surgery, and photography . hile the slope of the bed remains great andthe velocity consequently great, the stream has a compara-tively straight channel. As the slope is reduced the courseof the stream becomes crooked and winding and its corrasiveagencies are diverted from its bottom to its sides. Therefore,swift streams flow in straight channels, sluggish streams incrooked channels. This operation is being performed notonly in the main stream, but in its numerous affluents to theminutest rill, but with different intensity. Accordingly, thehigher branches have less power to cut and level the surface,and there the curves of their bed are convex upward. Such acurve is the curve of the terrane, while the concave curve isthat of the watercourse. The former is the curve of theupper relief of high slopes, and the latter of the valleys. In an arid region rainfall is scanty and spasmodic, stream-beds are few in number, and the drainage system is conse-quently imperfectly developed. There the erosion of the D 2 Urt — C. ^ >
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkjwiley, map
