Proceedings of the Federal Inter-Agency Sedimentation ConferenceBureau of Reclamation, Department of the Interior, 1948 - Hydraulic engineering |
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acre-feet aggradation alluvial alluvial fans amount analysis annual Arkansas River average bank bed-load bends Bureau of Reclamation canals canyon capacity channel close of comments Colorado River construction Corps of Engineers Creek cubic yards curve damage debris basins Denison depth determine dike discharge distance downstream drainage area drainage basin effect Elephant Butte Reservoir equipment erosion factors feet Figure flocculation flood control flood plain flow formula Geological gully harbor Hoover Dam hydraulic Imperial Dam increased irrigation laboratory land located material measurements methods Missouri River model study operation particles percent period range rate of sediment records reservoir sedimentation revetment River Basin sampler samples sand scour sediment deposits sediment load sediment production sediment transportation sedimentation data sedimentation problems sedimentation surveys shoaling silt slope Soil Conservation Service sounding square mile stations storage stream bed suspended load suspended sediment tion tributaries upstream valley velocity watershed
Popular passages
Page 49 - Congress to provide permanently for the control and prevention of soil erosion and thereby to preserve natural resources, control floods, prevent impairment of reservoirs, and maintain the navigability of rivers and harbors, protect public health, public lands and relieve unemployment...
Page 30 - Some of the areas mapped as Meadow were originally good areas of Congaree silt loam or Congaree fine sandy loam over which a mixed covering of sandy material has been deposited following the clearing of adjacent hillsides. The bottom land of Mill Shoal Creek about a mile from the county line is typical of this condition. It was reported that all the bottom was cultivated and the soil was Congaree fine sandy loam 12 years ago. At present the bottom land is a sandy wash with poor drainage and is covered...
Page 26 - Clastic rocks, as conglomerate, sandstone, and shales, formed of fragments of other rock transported from their sources and deposited in water; (2) rocks formed by precipitation from solution, as rock salt and gypsum, or from secretions of organisms, as most limestone.
Page 30 - ... originally good areas of Congaree silt loam or Congaree fine sandy loam over which a mixed covering of sandy material has been deposited following the clearing of adjacent hillsides. The bottom land of Mill Shoal Creek about a mile from the county line is typical of this condition. It was reported that all the bottom was cultivated and the soil was Congaree fine sandy loam 12 years ago. At present the bottom land is a sandy wash with poor drainage and is covered with alders and willows. The widespread...
Page 260 - ... with briefer reference than the reader may desire. 2. Sources of Sediment. There are seven principal sources of stream-borne sediment, namely: (1) Sheet erosion by surface runoff from precipitation on agricultural, range, forest, and waste land — sheet erosion being defined by soil conservationists as the removal of surface soil by overland flow without the formation of channels of sufficient depth to prevent cultivation or crossing by farm machinery. (2) Gullying, or the cutting of channels...
Page 145 - The Chief of Engineers is authorized to provide in the Canton Reservoir on the North Canadian River 69,000 acre-feet of irrigation storage, upon the condition that when siltation of the reservoir shall encroach upon the flood-control allocation, the irrigation storage will be reduced progressively unless provision is made to raise the height of the dam or otherwise provide compensatory storage for flood control on the basis of an equitable distributin of the costs among the water users and other...
Page 263 - So as late as 1841, a resident here could distinguish on which of the two branches of the Altamaha, the Oconee or Ocmulgee, a freshet had occurred, for the lands in the upper country (Piedmont) drained by one of these (the Oconee) had already been partially cleared and cultivated, so that that tributary sent down a copious supply of red mud, while the other (the Ocmulgee) remained clear, though swollen. But no sooner had the Indians been driven out, and the woods of their old hunting ground begun...
Page 263 - In the mean time we had leisure to take a full view of this charming river. The stream, which was perfectly clear, ran down about two knots or two miles, an hour, when the water was at the lowest. The bottom was covered with a coarse gravel, spangled very thick with a shining substance that almost dazzled the eye, and the sand upon either shore sparkled with the same splendid particles. At first sight, the sunbeams, giving a yellow cast to these spangles, made...
Page 122 - It is possible to carry on work in this way perhape for a whole day without the main sounding party even catching more than a glimpse of the plane table man. Surveys of Deltas or Other Areas In some dstailed surveys in reservoirs where it is desired to study the deposition of material brought in by tributaries and deposited as a delta, or to dstermine accurate bottom contours for several hundred fest immediately above or below a dam, a dstailed survey of such areas is best made by a radial sounding...