The elements of practical hydraulics

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Page 239 - Of History, Biography, Literature, the Arts and Sciences, Natural History, and Manufactures. A Series of Original Works by
Page 169 - thus preventing the inundation of the valley to the extent of nearly a square mile, where the country is below the level of the surface of the water in the canal. It
Page 176 - (now the drawbridge at Long-Sutton), at three-quarters ebb, the torrent rushed down four feet in the last quarter of a mile: this, of course, carries off the sand daily; and, by the law of nature, the four-feet fall will recede inland, until nearly a uniform inclination or slope shall penetrate to Wisbeach, which
Page 175 - If you cut a canal, you are sure that the removal of earth, and the usual apparatus of locks, will attain your object ; but the improvement of harbours, and of drainage by rivers, depends on the management and direction of natural causes and effects; in which, I may say, observation
Page 175 - of your river, and also straightening its course, so as to lose no downfall. This increased downfall and increased tidal water is made to bear directly upon the old sand-banks; and if the connexion with deep water can be established in this manner, you obtain a harbour of easy
Page 7 - be so, since the cause of this difference — the resistance of the air — increases as the square of the velocity, and, consequently, nearly as the
Page 174 - lower than it did in the old channel, immediately opposite to the South Holland and North Level sluices, which are the outlets for
Page 175 - management and direction of natural causes and effects; in which, I may say, observation has been so torpid, that till twenty years since, much more harm than good had been the result of interference. All the reports of Mr. Smeaton, and some made scarcely sixteen years since, prove that in large
Page 123 - friction of a body, when in a state of continuous motion, bears a constant ratio to the pressure upon it, which is the same, whatever may be the velocity of the
Page 175 - fall may become one inch, which is ineffectual. " The sound principle which results from these facts is, to give free ingress to the tidal water, guarding against inundation by raising the

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