Vízrajzi Évkönyv 91., 1986 (Budapest, 1987)
Tartalomjegyzék
FOREWORD This volume of Hydrographic Yearbooks is published in the 102th year of existence of Hungarian Hydrographic Service. In this country the first organization responsible for the measurement and evaluation of the country’s hydrographic data and for flood prediction was the Hydrographic Section, established in 1886 by the Ministry of Public Works and Transportation . In accordance with changes in economic conditions and in requirements imposed against hydrographic activites, since 1886 the organization of the hydrographic service underwent several changes: the tasks of hydrography were performed from 1890 by the Hydrograph Section ot the Ministry of Agriculture and later of the National Directorate of Hydraulic Construction of this Ministry, between 1929 and 1948 by the Hydrographic Institute sponsored by the Ministry of Agriculture, between 1948 and 1952 by different organizations of the water sector, between 1952 and 1976 by the Research Institute for Water Resources Development while since 1976 they have been managed by the Hydrographic Institute of the Research Centre for Water Resources Development and by district water authorities. During the past century the hydrographic service managed the acquisition for basic hydrographic information required protection against floods and for water utilization.A part of hydrographic data is published in Hydrographic Yearbooks. The Hydrographic Yearbooks have been published with the aim of summarizing, disseminating, occasionally illustrating the main data characterizing the hydrological measurement and observation system, as well as the hydrological conditions in Hungary over the year,- further of analysing the hydrological events and the variations thereof. The Hydrographic Yearbook comprises accordingly a chapter presenting a 828 stream gages, 2386 shallow groundwater wells, 636 deep wells /on artesian- and karstic waters/, 83 springs and 1426 meteorological stations, the schematical map of the standard network and the filing data of the networks. The main particulars of the hydrological and hydrometeorological networks operated by the district water authorities, the Research Centre for Water Resources Development and the National Meteorological Service have been tabulated. The areal pattern of the stations within the network is shown on the maps attached to the Yearbook. The chapter entitled "Hydrological conditions over the year" describes the precipitation and air temperature characteristics, the evaporation conditions, the hydrological characteristics of surface waters, presents data on ice conditions and depths over fords, on the inundations caused by undrained surface runoff, on pumped drainage, further the main hydrological characteristics of unconfines groundwater, springs and deep aquifers. The chapter on surface waters contains the daily stages on 156 gages, the daily discharge through 53 gaging cross section, further the water temperatures measured at 47 gages. Information is presented further on the sediment- and ice regimes on the major rivers,as well as on the variations in the depth over the fords on the Danube. In the cross sections where the streamflow rate is influenced significantly by surface slope, the streamflow has been determined in terms of the stage and surface slope, attaching also the auxiliary tabulations needed for the calculation. The data have been plotted in the form of stage hydrographs and diagrams showing the variations of cross-sections, water- and air temperatures, ice conditi- tions and depths over the fords. The chapter on subsurface waters contains the water levels in 39,1 shallow wells,the hydrographs of 45 wells, the map showing the areal variations of the groundwater table, the water levels in 55 wells on artesian, and those in 40 wells on karstic waters, the hydrographs for five deep wells, the yields of 19 springs and the yield hydrographs of two typical springs. The chapter entitled "Hydrometeorological data" presents information on the variations in precipitation over the year, over seasons and over the growing season, contains monthly data of 844 rain gages, further the data of high-intensity rains. The variations of snow cover thickness and snow-water equivalent at 52 stations have been tabuleted. Date are published on air temperature and evaporation from the open water surface, the areal pattern of air temperatures being shown graphically. The major part of the hydrological observation- and measuring network was transferred for operation to the district water authorities in 1981, where most of the observation data and records have been processed. The Hydrographic Institute of the Research Centre for Water Resources Development has been responsible for hydrological observations on the lake Balaton. The majority of the meteorological data has been made available by the National Meteorological Service. Comments on the present volume by the users of the Yearbook are invited and will be appreciated . Budapest, November, 1987. Dr. L. Ivicsics Dr. L. G о d a Cand. Techn. Sei., scientific Cand. Techn. Sei. adviser Director, Hydrologic Institut Dr.L. Alföldi Cand.Earth Sei. Director General, Research Centre for Water Resources Development- 10 -
