The Neuwürschnitz flood retention basin (HRB) in the Beuthenbach catchment area is located southwest of Chemnitz on the A72 motorway. The dam was built as a rockfill dam with an asphalt concrete inner seal. The total storage capacity is approx. 1,029,000 m³. The dam crest is 16.70 metres above the foundation base. The necessary underground sealing was carried out using the injection method. The HRB was designed as a "green basin". The outlet structure (operational outlets and spillway) was realised as an ecological canyon. Due to special requirements with regard to ecological continuity, the special construction of a stilling basin was chosen for the energy conversion plant. The operating outlets reduce the water discharge to the Beuthenbach to 1.5 m³/s. A discharge level was constructed below the stilling basin.
Client: Landestalsperrenverwaltung des Freistaates Sachsen
Processing period: 2008 – 2022
Main data:
Receiving water: Beuthenbach
Catchment area: 12 km²
Design flood BHQ1: 14.4 m³/s
Design flood BHQ2: 29.8 m³/s
Total storage capacity: 1.029 million m³
Rockfill dam with asphalt concrete inner seal
Crown length: 535 m
Dam volume: approx. 157,200 m³
Asphalt concrete for core seal: approx. 2,650 m³
Ecological culvert with HWE and service outlets
Services:
Project planning of civil engineering structures and technical equipment (hydraulic steel structures and EMSR technology) LP 1 to 9
Structural design LP 1 to 6
Surveying during planning
Subsoil services