Vízrajzi Évkönyv 97., 1992 (Budapest, 1993)

Tartalomjegyzék

2. Notes on the various chapters

A. THE DATA COLLECTION NETWORK

1. The chapter on the data collection network contains the list of the stations constituting the standard network.

The wells, just as the river gages, are designated by names coinciding with that of the village in whose area they are situated. Where the name of the village changed after the well drilled, the designation of the well remained the same, but the name of the village to which the well belonged in the year of report has also been entered in brackets along the wells. In the list of groundwater observation wells, just as in the list of river gages, data have been entered on the wells constituting the standard network.

In the list of deep wells those drilled for observing artesian water and water in karstified rocks have been grouped separately. The list of springs contains the main data of the springs, where the yield has been measured regularly by the district authorities during the year of report. The water levels in the deep wells were also read by personnel of the district authorities.

2. The relevant data of the hydrographic network have been presented in a separate chapter, grouped according to river gages, artesian and karstic wells and springs.

3. The modificated filing data of the stream gages and shallow wells are given in Chapter A.3.

4. In publishing the observation data for the year of report, the groundwater wells and meteorological stations have been grouped according to catchment areas, the boundaries of which are shown in a schematical map.

B. HYDROLOGICAL CHARACTERISTICS

1. The water regime of the streams, the variations in the level of subsurface waters, the ice conditions on the streams, the depth over the fords on the Danube are described on the basis of the measurement and observation data. These serve also as the basis for the comprehensive figures on inundations by undrained runoff, as well as on the operation of drainage pumps.

2. In the chapter entitled: "The characteristics of surface waters" the river gages are presented by streams in downstream succession, adopting a system in which the river gages on the main streams (the Danube and the Tisza rivers) are followed by those on the primary and on the secondary tributaries, again in a succession proceeding downstream along the river.

The tabulation of daily stages contains the water levels observed in the morning.

The stages read while the water surface was partly, or entirely covered with ice are distinguished.

In order to characterize the water regime of the streams, the typical monthly and annual stages for a decade with normal water regime, and for a recent period, further the extreme stages on record are also indicated at each gage for the sake of comparison. However, when examining the stages over an extended period of time, any occasional change in bed geometry over the particular river section must also be taken into account.

The elevation of the zero point had to be changed on some gages over the time. For the details thereof reference is made to the volumes of the Hydrographic Yearbook. The past stages entered in the Yearbook for the sake of comparison are related invariably to the current gage zero elevations.

The stages observed on the gages included in the standard network, but not published in the Yearbook are preserved in the data files of the Hydrographic Institute, while those registered on other gages are to be found in the files of the competent district authority.

The data tabulated as daily discharges are daily mean discharges. The data related to ice cover conditions are indicated by the symbols used in the tables of stages. At the bottom of the daily data monthly and annual typical data of the current year and the reference period have been grouped separately, indicating also the extreme values.

Some of the stage-discharge curves have been modified on the basis of more recent, or a larger number of measurement data, but such modification has not been extended to the previous years. The bivariate stage-discharge curves apply to the streamflow rates passing at peak stage conditions.

In some gaging cross sections, such as the reaches influenced by dams and tributaries on the Tisza River and in the Tisza Valley, the streamflow rate is influenced significantly by the surface slope as well. For such gages the relationship between the streamflow rate, the stage and the surface slope has been determined from the results of streamflow measurements. The daily mean discharges have been estimated using the relationship determined. For- 18 -