Vízügyi Közlemények, 2002 (84. évfolyam)

4. füzet - Rövidebb tanulmányok, közlemények, beszámolók

A Lapines árapasztó vápa építése 691 Construction of the spillway structure of the River Lapines By Robert G A AL and Csaba HORVÁTH Civil Engineers The total catchment area of the rivers Rába and Lapines (Figure I.) is 3,084 km

2, upstream of Szentgotthárd. In this river basin there are three sub-catchments of nearly the same size and length, those of the Rába (Raab), the Feistritz and the Lapines (Lafnitz). During the flood of 1965 a smaller part (of about 260 m

3/s) of the flood-flows, that broke out of the River Lapines in the territory of Austria, followed a natural spillway through the valley of the Creek Lahn, north of Szentgotthárd. During this passage of flood-flows the' highway of Szentgotthárd-Rábafíizes was inundated over a length of about 600 m (Figure 2.). A programme of levee construction was launched to protect against flood water levels which occurred during the 1965 flood. The dikes along river Lapines were constructed in the period 1979-1982 (Figure 5.). Simultaneously the near-border parts of the Lapines were also regulated in the framework of a joint Austrian-Hungarian project. Levees of the River Rába were constructed in the period 1982—1984 and in the inner part of the city of Szentgotthárd a supporting wall was erected (Figure 4.). Results of the hydraulic scale-model experiments carried out in the Laboratory of Nick indicated that of the increased design flood-flow" of 700 m-Vs of the River Lapines only 460 m

3/s can be released through Szentgotthárd and the remaining 240 m

3/s should be released through a spillway into the valley of the creek Lahn (Figure 5 ). A spillway system complying with these requirements was constructed. A fixed sill of 250 m length was constructed in the upstream part of the bridge, which connects Heiligenkreutz and Mogersdorf (Figure 5.). The level of this sill confines the flows to maximum 240 nvVs, which will enter the spillway trough (Figure 6.). The flow conveyed by this spillway-trough enters Hungarian territory and passes below the bridge of Rábafüzes-Szentgotthárd (Figure 7.) and enters the valley of the creek Lahn. This spillway-trough is made of grassed earthen channel and its total length is 4358 metres, of which 2008 m falls into the territory of Hungary. A low-water channel was also constructed within this spillway-trough (Figure 8.), which partly coincides with the channel of the creek Lahn. This small rivulet was designed with a meandering route and the permanent flow of minimum 0.2 m

3/s secures near-natural ecological conditions. In the Hungarian part of this spillway-trough an artificial chain of small lakes also enhances the establishment of wetland habitats (Figure 9.). The construction of the flood spillway system of the river Lapines provides a good example of transboundary co-operation as well as of the harmonisation of flood-control and ecological interests. * * * Ausbau der Hochwasserentlastungsmuldc der Lafnitz Von Dipl.-Ing Róbert GAÁL und Dipl.-Ing. Csaba HORVÁTH Knapp unter der österreichisch—ungarischen Staatsgrenze, bei der Stadt Szentgotthárd, mündet die Lafnitz in die Raab. Die Gesamtfläche des Einzugsgebietes der beiden Flüsse (Bild I) ist 3.084 km

2. Es befinden sich darin drei Flüsse ungefähr gleicher Länge und gleicher Einzugsgebietsgrößen: die Raab/Rába. die Feistritz und die Lafnitz Lapines.