Vízrajzi Évkönyv 99., 1994 (Budapest, 1995)
Tartalomjegyzék
tion containing the corresponding values of the stages (h, cm), the surface slope under steady flow conditions (I0, cni/km) and the stream flow rate (Q0, m7s) under similar conditions. Hereafter, in the knowledge of the simultaneous stage data on the auxiliary gage also indicated in the table, the actual surface slope (I, cm/km) for the given instant over the reach included by the two gages has been determined. These data have then been entered into the fonnula Q = Qo V(I/I0) to find the actual streamflow rate Q(m3/s) passing the gaging cross section under consideration. For estimating the streamflow rates through the Szeged gaging cross section on the Tisza River, allowance had to be made, besides the stages on the Mindszent gage, also for the stages on die Makó gage on the Mams River. Consequently, the value of I0 had to be found from the auxiliary table in terms of the stages at Szeged and at Makó. The streamflow rates through the cross sections, for wliich three-, or multi-variate relationships are published can be calculated only by taking the other two (or tluee) variables simultaneously into consideration (no variable must be omitted, or neglected in the calculations). Typical water temperature data arc given for the gages wliich are representative for longer river sections controlling the variations in water temperature. The water temperatures are measured in the morning at 10 to 40 cm depth below the water surface. The hydrological particulars (stages, streamflow rates etc.) over some streams, or sections of streams, such as the Sió Canal, some sections in the Tisza River System, are influenced by human activites, such as the operation of weirs, diversions, discharges. The extend of these influences varies with time, and the length of the river section affected depends on stage. The duration in time and range of these effects can be indentified by a detailed analysis of die observation data alone. The data on sediment transport - bodi for die current year- and die longer period - are values estimated from observadon data. The values corresponding to die highest discharges on record and observed during die year of report and before die year of report have been entered as extreme values. The concentration of suspended sediment is estimated on die basis of samples taken from 7 to 9 verticals in a cross section. Sample of one litre volume are taken at ten points evenly spaced over each vertical. The mean concentration in die vertical is found from die ten samples combined. The extreme values have been calculated by extrapolating die correlations between the quantities describing sediment transport, and should therefore be regarded as approximate values only. 4. The chapter containing die data on subsurface waters has been completed with die water levels in the key deep wells (on artesian- and karstic waters), and widi die hydrographs of some artesian-water observation wells. The elevations of die springs above die Baltic level have in some instances been obtained from maps, in odiers by geodetical surveying. The maps of the data collection network indicate die meteorological stadons gages, springs, and wells of the standard network and die stations of die Central Meteorological Insdtute.- 19 -
