Hazard Zone Plan Drau - Lavamünd Reservoir

Project objectives

The aim of the project was to prepare a hazard zone map for the Lavamünd reservoir in order to assess the flood risk for the municipalities of Lavamünd and Neuhaus and to derive suitable protection measures. This was carried out in coordination with the Federal Water Engineering Administration and in compliance with the Technical Guidelines for Hazard Zone Planning (RIWA-T).

Project description

The project area covers the 6.2 km long Lavamünd reservoir, extending from the Lavamünd weir system (km 413.1) to the Schwabeck weir system (km 419.3). The entire Drava is characterised by a chain of reservoirs operated by Verbund Hydro Power AG (VHP). A key part of the project involves the analysis of riverbed aggradation and sediment balance.

Project data

• Study area: Lavamünd reservoir (6.2 km)
• Hydrological dimensioning: HQ₃₀, HQ₁₀₀, HQ₃₀₀
• Highest calculated flood discharge (HQ₁₀₀): 2,700 m³/s

Services

• Hydraulic modelling of the reservoir with a 2D model
• Analysis of bed sedimentation and the sediment balance, in particular due to bed load input
• Creation of flood impact lines and hazard zones for various flood probabilities