Vízrajzi Évkönyv 99., 1994 (Budapest, 1995)
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 arc situated. Where tire name of the village changed after tire 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 lias 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. hi the list of deep wells those drilled for observing artesian water and water in karslified 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 modificated filing data of the stream gages and shallow wells arc given in Chapter A.2. B. HYDROLOGICAL CHARACTERISTICS 1. The chapter of hydrometeorological data contains monthly and annual precipitation depths, the depth and water equivalent of the snow cover and the evaporation from open water surface. 2. 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. 3. 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 diose on the primary and on the secondary tributaries, again in a succession proceeding downstream along tire 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, tire typical monthly and annual stages for a decade with nonrral water regime, and for a recent period, further tire extteme stages on record are also indicated at each gage for tire 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. Tire elevation of tire zero point had to be changed on some gages over tire time. For tire details thereof reference is irrade to tire volumes of tire 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 hr tire standard network, but not published in tire Yearbook are preserved in tire data files of tire Hydrographic Institute, while those registered on other gages are to be found in tire files of tire competent district authority. Tire data tabulated as daily discharges are daily mean discharges. Tire data related to ice cover conditions are indicated by tire symbols used in tire tables of stages. At tire bottom of tire daily data monthly and annual typical data of tire current year and tire reference period have been grouped separately, indicating also tire extreme values. Sonre of tire 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. Tire bivariate stage-discharge curves apply to tire streamflow rates passing at peak stage conditions. In sonre gaging cross sections, such as tire reaches influenced by dams and tributaries on tire Tisza River and in tire Tisza Valley, the streamflow rate is influenced significantly by tire surface slope as well. For such gages tire relationship between tire streamflow rate, tire stage and tire surface slope has been detemrined from tire results of streamflow measurements. Tire daily mean discharges have been estimated using tire relationship determined. For such calculations tire I0 and Q0 values pertaining to tire particular stage have been obtained from tire tabula- 18 -
