Waterways and irrigation1916 - Engineering |
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acre-feet acre-foot acres agricultural alfalfa average banks basins bi-pass built C. E. by letter California canal capacity Carey Act carried channel charge concrete construction cost crops cubic metres depth discharge ditches drainage drains dredging duty of water dykes economic effect Elwood Mead engineers estimated evaporation excavation farm farmer feet flood control flow Government gravel hectare height Huai River important improvement inches increase jetties Kaoliang Lake Lake Biwa less levees locks lower Malamocco masonry material maximum meters method miles Mississippi River natural navigation outlet overflow plants portion practice present problem pumping quantity of water rainfall Reclamation reservoir Rhine runoff Sacramento Sacramento River slope soil spillway square miles storage stream surface tion tons tributaries United upper Urgel canal Valley velocity Volga water supply watershed waterways weir width Yellow River
Popular passages
Page 718 - General Causes affecting the Stability of Earthwork. — Earthwork gives way by the slipping or sliding of its parts on each other. The resistance to this is due, partly to the friction between the particles, and partly to their mutual adhesion or cohesion. The friction...
Page 146 - When the journal was drawn up, it was my intention to have divided the map of the Mississippi river from the mouth of the Ohio, to the...
Page 683 - ... the following rules may be taken as a rough guide: 1. Massive or crystalline rocks, such as granite, gneiss and schists, will transmit water less freely than those of sedimentary origin. • 2. Stratified rocks will transmit water much more readily in the direction of stratification than transverse thereto. 3. In the direction normal to stratification, sandstone will generally transmit water more readily than limestone, and the latter more readily than shale. 4. Stratification on a plane approximately...
Page 632 - His Excellency the Governor, with the advice of the Executive Council, has been pleased to establish the following Provisional Regulations, under which Licenses may be obtained, to search for, and remove the same: 1.
Page 740 - ... TO add to the stability of the repair, a strong and welldrained earthen berm should be placed just beyond the original toe of the dam, and its own toe should be secured by a second drystone wall. All these drains and walls should, if possible, be founded on rock, but, where this is not to be found at a reasonable depth, they should be carried well into the natural subsoil and beyond the limit of disturbance caused by the slip. Earthwork usually fails at one point, and, as soon as it commences...
Page 718 - A slight addition of moisture increases the coefficient of friction, but an excess of water acts as an unguent in diminishing the friction. The adhesion, or cohesion, may be measured by the depth to which an unsupported face of earthwork will stand before that is affected by the weather ; it gives additional stability to earthwork. It is an extremely varying force ; it is increased by a moderate amount of moisture, but is diminished by excessive wetness. It is therefore evident that any given earthwork,...
Page 719 - The lower portions in a large dam must, however, be in a very different condition to that of the upper ones, as they are much more highly compressed and are moister. Probably the enormous superincumbent weight causes some stratification of the lower parts and diminishes their cohesion, while the increased smoothness, due to the pressure, lessens their frictional resistance. The amount of increase of frictional stress, according to the depth below the surface, depends upon the viscosity of the earth...
Page 458 - ... and, for the purpose of so doing, may establish and enforce such rules and regulations as it may deem necessary or expedient.
Page 498 - One farmer, although he has a superior water right, should not be allowed to waste enough water in the irrigation of his land to supply both him and his neighbor, simply because his land is not adequately prepared for the economical application of the water.
Page 61 - Puget Sound, the Columbia River and its tributaries, and the rivers of central California. Most streams included in the foregoing table are navigable only, for light-draft boats. Forty streams have a total of about 2,600 miles of 10-foot navigation, and 70 streams give about 3,200 additional miles of navigation of from 6 to 10 feet during the greater part of the year, making a total of about 5,800 miles of river navigation 6 feet and over.