Vízügyi Közlemények, 1996 (78. évfolyam)
1. füzet - Abért L.-Baross K.: Árvízvédekezés a Rába folyón 1996. áprilisában
136 A bért László-Baross Károly Basin brought along considerable precipitation ( Table I.), which, together with intense snowmelt caused heavy floodings in the rivers of western Hungary. Peaking data of the flood hydrog raphs (Table 2.) indicate, along with the results of the analysis of flow records, that in the section betw een Vasszentmihály and Sárvár this was the highest flood since 1965, inundating the entire Rá ba-Csörnöc Valley. Peaking at Körmend was also just 23 cm lower than that of the year 1965. Downstre am of Sárvár the situation was somewhat relieved by the absence of a coinciding flood о f the GyöngyösPerint-Sorok water system. Peaking water levels of the section between Szentgotthárd and Árpás were 23—82 cm lower than the ever recorded highest ones ( Table 3. ). Downstream of Árpás the flood hydrograph flattened out and, due to the low water levels of the Danube, the water stages at the mouth section of Győr hardly exceeded the limit value of the "flood emergency stage I." Flood emergency stages in the area of the Nyugat-dunántúli VIZIG (West-Transdanubian Wa ter Authority) varied between Stage 111, for the section between Szentgotthárd and Körm end, (Fig. 4.) and Stage II, for the Sárvár section (Fig. 5.). In the area of the Észak-dunántúli VIZIG (North-Transdanubian Water Authority) flood eme rgency stage III was declared for the 86 km long section between Sárvár and Árpás, while fo r the section Árpás-Györ it was Stage II. Due to the rapid propagation of the flood hydrograph and to the corresponding changes of the water levels actual flood defence operations were needed at certain sections only, where the base-soil was problematic (Fig. 6.). Peaking water levels along the right bank of the River Rába, in the vicinity of Ragyogó, were only 25—30 cm below the levee crest. Somewhat uncertain forecasts nece ssitated the making of preparations for the opening of the emergency storage basin along the right bank of the river. This was the first significant flooding event, since the rearrangement of the organizat ion of district water authorities, that put the flood defence capacities of the recent system to a test. The most important experience was that more accurate information is needed from the Austria n part of the Rába River Catchment, since the accuracy of the flood forecast presently made, does not enable the making of proper preparations for the opening of the emergency flood storage basin along the right bank of the Rába. The success of the defence operation is put at risk, because the lack of financial funds prevents the elimination of the faults in the base-soil (under the levees) at site s, which have been identified during earlier surveys. The presently available technical and labourer staff of the water authorities only ena ble the organization and management of the flood defence operations. This means that external forces must be recruited for the successful defence. The equipment and vehicle fleet of the authori ties are outdated, which does not support the defence work either.
