Vízügyi Közlemények, 1936 (18. évfolyam)

Kivonatok, mellékletek - Kivonat a 2. számhoz

VIII. The Truyère project with the Sarrans dam of 105 m height and a storing capacity of 300 million cu metres ; the arched Bromme-dam of 36 m length, and the subterranean Brommat power plant of 234,000 horse power (figs. 1—5, photos 1-5). The Eylie power plant with a canal connecting several watercourses, and storage in natural lakes of the Pyrenean mountains ; this is a typical project of that region. Its net head is 1020 m (fig. 6). The Camon project is a good example of water power plants of small head (photos 7, 8) ; it cooperates with the Valentine automatic power plant. The Sautet dam of 126 m height, though it has the appearance of a gravity dam, is really the highest arched dam so far constructed (figs. 8—10, photos 9—13). The Chambon dam, 137 m high, is the highest dam in Europe (fig. 11, photos 15—16). The Bissorte project, remarkable for its pressure conduit with its characteristic value of HD

2 = 2360, which is a maximum value of conduits constructed so far. The writer gives the general outlay, and adds some interesting details of these projects ; he points to the important part played by laboratory investigations in their construction. (Toulose, Grenoble, Bellevue, fig. 3, photos 13, 14.) Descriptions of these projects have been published in different periodicals, therefore instead of giving a detailed summary we refer to the references cited in this article. VII. SURVEYING OF RIVER BEDS. By S. HORVÁTH. (Pages 235—254.) In surveying river beds a special method has to be employed, because the bottoms of rivers are not amenable to the ordinary methods of land surveying. When drawing contour lines in a river bed the level of the low water serves as comparative datum. The depth of water can be measured by stretching a wire rope across the stream, and taking soundings along it with a sounding pole or a. lead weight attached to the end of a line. This method can easily be applied on small streams, but the stretching of rope across a large river is rather difficult, and disturbs navigation. Besides, this procedure is slow, because only y

2 to 1% kms of the stream can be surveyed in this manner in a day. Another method is surveying with the sounding tachygraph (Sondiertachygraph). The essential feature of this method is that, by means of a tachymeter attached to a plane table (fig. 8, page 248), we mark those points in a situation plan, where the depth of water is measured by a sounding pole or a lead w

yeight from a boat which is rowed across the stream (fig. 7). The auxiliary implement for measuring distances is a pole with targets set up in the boat (fig. 9, photo 2). By this method of the sounding tachygraph the daily performance of surveying is about 3 kms of river.