Vízrajzi Évkönyv 76., 1971 (Budapest, 1973)
Tartalomjegyzék
6./ Water temperature conditions are described in the chapter "Characteristic data of water temperature". Data are referring to morning temperatures measured at a depth of 20 to 40 cm below surface. For the sake of comparison, there are presented, beside the data referring to the year in question, characteristical monthly and yearly data of a number of years /generally a decade/ together with the extreme values occurred so far. Calculation and tabulation of data have been processed by a computer. ?./ Concerning the ice conditions in ./inter, a summarized information is given for the rivers in the Danube and Tisza valleys. From the figures, the dates and durations of drifting ice and of solid ice cover may be determined, showing also ice thickness as reported by the observes. As a supplement, water and air temperature data of some stations are added. 8. / The characteristic data of sediment discharge /both those of the year in question, and those of longer preceeding periods/ are computed values based on observed data. Extreme values, are considered those corresponding to the highest river stages occurred up to now, or, respectively, within the year in question. The sites where sediment measurements were carried out in the course of the year, are plotted on the chart given at the end of the Annual. 9. / For the sake of keeping a recorder navigability conditiohs, a graphical presentation of the shallows conditions on the Danube and the Tisza is given. Due to lack of space, only the most unfavourable shallows /fords/ are presented for each river reach. On the figures,the depths of the shallows are illustrated by using various types of hatching. For facilitating the study of existing correlations, also stage hydrographs of river gauges used basically for the purposes of navigation are shown. In addition,there are frequency and duration curves for the occurence of various depths within given river reaches. Durations have been compared, in the case of the Danube, to average duration values from the period beginning with 1949, and, in the case of the Tisza, to those of the period beginning with 1946, or 1960, respectively. III. Subsurface waters. 1. / In respect of characteristic ground-water stages it is noted, that,in the Annual, only observation data from the most important stations of the national groundwater gauge network are printed according to the hydrological year, by using the watershed sub- division outlined in chapter A.7. However, at the end of the individual groups, all the other observing stations are listed, together with the year at which observations were started /in parentheses/. The hydrological year, beginning on the first of November, is numbered according to the calendar year with which its major part is coinciding. In addition to the characteristic data of groundwater stages, presented are, according to possibility, the monthly and annual mean and extreme values for the years 1939- 1944, since 1939 or 1954 respectively, and also the recorded highest values of groundwater level fluctuations together with their date of occurrence occurred. Concerning the locations of the observing wells, information is found on the chart at the end of the Annual, while the retrieving of data is facilitated in chapter A.l. by the lists of stations yielding information in an alphabetical order and in a serial sequence as well. 2. / Under the title "Some groundwater stage curves" one will find a graphical presentation, for a number of characteristic groundwater-gauging wells, showing on the hand, the monthly, annual and normal water levels together with their extreme values for the last 20 years; and, on the other hand, from various regions of the country /mainly, howeXXIII
