Vízügyi Közlemények, 1970 (52. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

(32) numbers 1, 2 and 3 a significant shift is likely to take place in the ratio of occupation in the productive and non-productive branches, in that the proportion of active population occupied in the furnishing branches comprised in group III —transport, traffic and commerce, further the non-productive branches of administration, social care and culture —is expected to increase, whereas that occupied in branch I, comprising agriculture and industry is likely to decrease. The first Chapter of the contribution is devoted to Settlement categories and types, Chapter 2 to the population considered to be Supplied and the proportions of Supply, Chapter 3 to changes in the average per capita consumption according to types of towns, Chapter 4 to the peak per capita consumption and the seasonal variability factor, while Chapter 5 to the comprehensive Summary of the results of the survey. BRIEF PUBLICATIONS AND REPORTS 1. Juhász, E., Civ. Engr.: The application of aerial photography in water management (For the Hungarian text see pp. 232) Owing to the abundance of information Supplied and the direct applicability of dimensions obtained therefrom, photographic maps of 1:50 000 scale are most useful. The location of the ground points required for its preparation is Shown in Fig. 1, the number of such points being compiled in Table I. Banklines can be traced on the aerial photographs using a stereoscope and the points identified require only levelling. Mapping of larger areas by field parties is more expensive than by photogrammetry. Ground reference points can be marked in an economical way using plastic slabs. For the high-precision determination of elevations, pictures taken from altitudes lower than 200 m are necessary, but owing to drift this is impossible to accomplish from normal aircraft. Photographs taken with a wide-angle lens camera from helicopters should be well suited for the vertical determination of terrain features and watersurface elevations. This remains to be verified by further experiments, during which the method of processing must also be evolved. Using a manual Hasselblad camera, supplementary and occasional photographs of good informative value can be made from a ballon, or a helicopter. 2. Bognár, Gy Civ. Eng.: A neiv station in the development of the Rhône, the Yallabrègues Barrage (For the Hungarian text see pp. 242) Under the program aiming at the comprehensive utilization of the Rhône River a new project featuring a power canal (Fig. 1 ) has been completed. The weir is shown in Fig. 2. The upstream section of the power canal is 3 km long and 15 m deep on the average. The six tubular turbines of 415 cu.m/Sec discharge, installed at the power station ( Fig. 5) represent a capacity of 210 MW. The powerhouse is flanked by a two-span spillway. The area of the navigation lock in plan is 195 by 12 m. Construction pit enclosure has been realized by Solétanche witîi the help of a plastic wall. Other works attendant to the project are the diversion of the Gard river to discharge into the tailwater, the construction of levees and an intercepting canal, further of new roads. The barrage was commissioned on the 14th January, 1970. 3. Gajárszky, Gy., Agr. Engr. : Temporary hose-dams (for the Hungarian text see pp. 251) Hoses as dams can be used in flood fighting as crest dikes and as other temporary closures of small height. The advantage of hoses over conventional materials is ease of transportation, Speed of erection, simple Storage and no special maintenance.