ASSESSMENT OF TECHNICAL CONDITIONS OF BANK PROTECTION OF WATERCOURSES AND RESERVOIRS IN THE CITY OF POZNAŃ

Abstract

Aim of study The aim of presented paper was to assess the technical conditions of bank protection in Poznań on following hydrotechnical structures: the Warta River, Cybina River, Malta Lake, Rusałka Lake, Bogdanka River, Sołackie Ponds and the Główna River. Materials and methods Both river banks and reservoirs in cities require a specific approach. Natural processes (sediment accumulation, surface runoff, seepage) and human activity (including thoughtless acts of vandalism) force the need for continuous monitoring of banks and taking targeted measures to ensure safety in their vicinity. Properly designed, constructed and maintained reinforcements allows for long-term protection of embankments against damage and protect city residents against flooding. In Poznań, access to the banks of the Warta River and its tributaries is unlimited. Along the waterway there are walking and cycling paths. There are water barrages on the watercourses and reservoirs are among the most attractive spots in the parks. The largest artificial reservoir, Malta Lake on the Cybina River, has a regatta course and a small beach, meaning it is under strong anthropopressure. The stands of regatta course and its technical facilities are utilised during mass events by thousands of water sports enthusiasts. From the first warm days of spring, the banks of the Warta on the downtown section are occupied by Poznań citizens. Open at 4 city beaches water equipment rentals offer kayaks and motorized boats. Results and conclusions The overall condition of checked reinforcements of river banks and water reservoirs should be evaluated as good. The flexible strengthening in a form of a stone coating was in the worst, though still satisfactory, condition.