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Flood protection in Kulmbach
Redesign of the Purbach culvert as a further measure to protect against flooding due to heavy rainfall
In the past, heavy rain often caused flooding in the Blaich district of Kulmbach in northern Bavaria. The flood basin of the town on the White Main (Weisser Main) River has now been improved and the protection measures against extreme flooding events have been extended. Where the underground channelling of the Purbach stream enters the flood basin, a new section required to be constructed, beneath the paved surfacing, to facilitate the safe discharge of floodwater from the Purbach. The channel will now discharge floodwater (for HQ100 = 11.0 m³/s) via a culvert into the White Main River. The dimensioning was carried out using a hydraulic 2D calculation model. The base of the rectangular culvert has a transverse gradient to concentrate low-volume flows at one side of the culvert. The 486m-long channel structure was constructed in an excavation formed by bored pile walls which also form part of the final structure. The traffic areas on the surface were then reconstructed from an urban planning perspective – for example, with the Blaich crossroads replaced by a roundabout in order to improve the flow of traffic.
Inros Lackner was responsible for the construction work in the role of General Planner, on behalf of the town of Kulmbach. At the end of April 2023, the flood protection measures were inaugurated by Bavaria's Environment Minister, Thorsten Glauber.
(Source: bayern.de, fraenkischertag.de)