Vízügyi Közlemények, Kivonatok, 1965

Dégen Imre: Az 1965. évi dunai árvíz és árvízvédelmünk fejlődése

(48) resulted in crevasses, thus on the Répce Floodway Canal (Fig. 10), th^ Rába River (Figs. 11, 12). the Hanság Main Canal (Fig. 13) and the Marcal River. Experiences gained during the flood are summarized and damages are assessed in Chapter 3. The inundated area is shown in Fig. 1. Along the unprotected watercourses and over the areas inundated by water which spilled through the crevasses considerable damages occurred. The area inundated for a brief period was 86.000 hectares of which one-third was iieldland. Inundation water was drained by matural channels in a brief period and 46.000 hectares were inundated for a few days onlyPartial evacuation became necessary in 68 communities and 353 houses had to be rebuilt. The number of bridges destroyed on main roads was 3, on railroads 1 and on farm roads 29. Conclusions on flood control along these watercourses are summarized finally. 4. APPRAISAL OF THE EXPERIENCES OF THE 1965 DANUBE FLOOD AND PROBLEMS OF THE STRENGTHENING OF THE DYKES 4.1 EXPERIENCES OF CONTROL OPERATIONS ALONG THE DANUBE By M. Breinich, Civ. Eng. (For Hungarian text see pp. 295) In the introductory part of the paper it is established that after the 1954 and 1956 highwaters levee reinforcement works were started with considerable forces along the Danube, but financial means were limited and the protective value of Danube levees is still unsatisfactory. The loading presented by the highwater on the levees was far from uniform, as pointed out in Papers 4.2 and 4.6. Subsequently, the methods applied for active protection, the experiences gained with them, improvement and modernization of flood control materials, equipment and tools, as well as experiences gained in connection with organizational problems are described. Methods applied for active protection and experiences gained with them are described in Chapter 1. During the 1965 highwater protection became necessary against a) overtopping stages, b) slumping of slopes due to saturation, and c) boils, piping and hydraulic soil failure due to underseepage. No protection against wave action was required. a) Emergency crest dykes of several rows of sandbags were built against overtopping (Fig. 1).