Vízrajzi Évkönyv 88., 1983 (Budapest, 1984)

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 network.The list of gages presents the main data on the gages both comprised in, and outside of, the standard network,on which water levels are observed regularly.The data on gages not read regularly, such as e.g. flood gaaes, are not included in the list. The gages within the standard network, except those on lakes Balaton and Velence, have been operated since January 1, 1981 by the district water authorities, where the water-level data are also processed. The code number of the oages within the standard network is a five-digit number consisting of Arabic figures, while the gages not comprised in the standard network bear code numbers consisting of Roman and Arabic figures. In the chapter the gaaes of the standard network are grouped also according to streams and shown on a schematic map.

Responsibility for the operation of the observation wells on groundwaters at small depth was transferred in 1981 to the district water authorities. The TIst of wells comprises the data on the wells which were transferred for operation from the Hydrographic Institute to the district water authorities, as well as on those in which the waterlevel readings had earlier also been taken by the district water authorities. 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 well. In the list of groundwater observation wells, just as in the list of river gages, data have been entered on the wells alone, in which water level readings were taken regularly during the year.

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 €he~main data of the springs,where the yield has been measured regularly by the Hydrographic Institute during the year of report. The water levels in the deep wells were also read in 1981 by personnel of the Hydrographic Institute.

The major part of the meteorological stations belongs to the National Meteorological Service, the rest being operated by the district water authorities and the Hydrographic Institute. The lists of river gages, springs, wells and meteorological stations contain all the observation sites, where regular readings were taken over the entire year, or over a part of the year, viz. the data of sites abandoned, or newly established during the year of report.

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 data to be used for occasionally necessary corrections of river stages, or groundwater tables are given in Chapter 3.

4. In publishing the observation data for the year of report, the groundwater wells and the 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, ass well as on the operation of drainage pumps.The hydrometeorological factors,such as precipitation,air temperature,sunshine duration evaporation, which have a substantial influence on runoff conditions are also analysed.

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 stream /the Danube and the Tisza rivers/ are followed by those 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 morning stage readings are taken at 67.00 hourg in the period between the 1st April and the 30th September, while at 08.00 hours over the rest of the year. During "Summer time" periods '-he times of reading are shifted accordingly.-22-