Vízügyi Közlemények, 1935 (17. évfolyam)

Kivonatok, mellékletek - Kivonat a 4. számhoz

21 factory, because the channel of the Sió could carry only 6—7 cu metres per second without overflowing its banks. No further improvement was carried out at that time on account of the dry years following, when the evaporation on the large surface of the lake kept the water level nearly constant. In 1891 the sluice was reconstructed (fig. 6—8, photos 2—3). Wet years did much to further the regulation of the Sió channel, which took the form of increasing the slope in the channel and improving the capacity of the sluice (fig. 2). The increase of slope involved some works for stabilizing the channel downstream of the sluice (fig. 9 : 1902, fig. 10 : 1923). In 1927 masonry parts of the sluice were repaired by pressing in cement mortar (photo 4), and then the apron, which had been undermined, was adjusted (photos 6, 7— II). Until a new sluice is formed by constructing the proposed lock and water power plant indicated by the dotted line in figure 13, it will be difficult to maintain the apron of the existing sluice. Photos 12—14 show the recent damages observed in 1932 -34 ; 15 and 16 illustrate the concrete threshold built at the end of the apron in 1934 ; and 17 and 18 depict the effect of notches in the end threshold made provisionally as a trial. HI. WATER REGULATIONS TN THE ENVIRONS OF THE CITY OF SZEGED AND THE ESTABLISHMENT OF THE FISH-POND AT FEHÉRTÓ. By I. PAP. (Pages 622—040.) It is well known that in the course of the past century the Hungarian nation carried out vast flood-controlling operations, by which about 4 million hectares were protected from inundations that had been wont to recur from year to year. But the construction of levees, which prevented the floods of rivers from spreading over the plains, was not sufficient to prevent the damage of lands by water. It often occurred in wet periods that a considerable part of the protected lowlands was covered with rain-water falling immediately upon it. This inland water, as it is called, had to be drained off by means of special works : canals and pumping plants. Besides this, lowlands protected from flood and inland water suffer much damage from rain-water running off from surrounding higher areas (this is called outland water) ; and the article deals with a special problem in Ibis field : the regulation of outland waters in the territory of the flood-control and drainage company of Szeged. The protected area of about 23,000 hectares around the City of Szeged is exposed to the run-off waters of about 150,000 hectares which bordering it (fig. 1). The latter area, with a slope of about 1-0 metre per kilometre, is formed of alluvial sand, and in the direction of the dominant northwest to southeast winds several valleys have been cut in carrying a large volume of water onto the protected area. Usually ponds and old river-beds in the protected area are able to store this water, but in wet periods the adjacent cultivated lands are much endangered. Several designs have been proposed to solve the problem. Among these, a canal traced along the high border of the protected area, as shown in figure 2, seems