Vízügyi Közlemények, 1966 (48. évfolyam)

4. füzet - Rövidebb közlemények és beszámolók

(80) In the framework of the International Hydrological Decade, for promoting hydrological education the UNESCO assigned Hungary to organize the first international course. Scholarships were granted by the UNESCO to 13 participants, who were made acquainted in 330 lecture hours, from January to June, 1966, with the theory and practice of hydrological methods used in water resources management, with recent research achievements in hydrology, with inclusive information on water resources and with modern methods on controlling and conserving these resources. The course was held in English language and the material has been published in a series of lecture notes, on 1000 pages comprised in 13 volumes. In the paper a list of participants, subjects, lecturers and the titles of papers prepared by the participants is given. 3. Csermák, В., Civ. Engr. : Water uses l'ile. (For the Hungarian text see pp. 408) Connecting to the paper „Collection and processing of hydrological data in the interest of water resources management" published in Hydraulic Engineering, No. 1., Vol. 1966, a brief review is given on the water uses files kept by water authorities and special branches of resources management. Aspects governing recording and filing for efficient resources management are discussed more in detail, the present situation is described and future trends in documented information are outlined. » On the number of water uses in Hungary and the significance of detailed files the following figures are given: a

) The total number of filing cards is at present 25 700 and is expected to increase by 1980 to about 50 to 60 thousand, though the essential functions of water resources management could be performed with 6 to 8 thousand filing cards as well. b) The filing cards of more important water uses are used on 5 to 10 occasions annually and an increase of 50% is anticipated in the future. c) Th frequency with which the filing cards of minor water uses and hydraulic construction works are used may on the average be estimated at the half of the foregoing. Since the bulk of work consists of the filling and checking of filing cards, rather than their use, instead of mechanical processing, data collection by evaluation on the basis of engineering considerations should be preferred. <í. Domokos, M., Civ. Engr.: Characteristic discharge distributions (For the Hungarian text see pp. 414) Duration curves play an important role in the characterization of hydrological data. As pointed out by Spengler and Richter, duration curves relating to different periods can be used for constructing different kinds of resultant duration curves, namely according to mean abscissae, according to mean ordinatae, and the central duration curve (where ordinatae are the characteristic quantities). In Hungarian practice—thus in the Hydrographie Yearbook as well —duration curves according to mean ordinatae are used. The component set of discharge duration curves should preferably be substituted by a family of resultant curves, rather than by a single resultant curve, and the discharge duration surface is obtained in this manner. ( Fig. 2). The changeover to this method is suggested in general practice. )(ő. Orlóci, I. and Török, L., Civ. Engrs.: New types of surface regulating installations on the Hortobágy Main Canal (For the Hungarian text see pp. 420) The structure constructed at the location shown in Fig. 1. maintains watersurface on the discharge range from 6 to 12 cu.m/sec at bankline height with a fluctuation of 10 cm, and causes no appreciable backwater at discharges exceeding 12 cu.m/sec. One of the installations is the semiautomatic tilting leaf illustrated in Fig. 2., continuous regulation is accomplished with the help of the automatic sector gate shown in Fig. 3. Hydraulic dimensioning is described with reference to Fig. 4., while force diagrams are given in Figs. 5. and 6. The structure was built in 1963 and operated satisfactorily since, (i. Dr. Schneider, Sz., Civ. Engr.: Watersurface oscillations in deep wells (For the Hungarian text see pp. 430) The static level of deep wells drawing on an artesian aquifer is considered constant in sudies extending to relatively short periods of time. Oscillations are started by sudden starting and stopping of withdrawal. Instead of the depth of the well, the time constant derived from reduced length is entered into calculations. The method is illustrated by a numerical example.