Pre-lock Thossfell

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Pre-lock Thossfell
Site plan of the Pöhl dam
Site plan of the Pöhl dam
Location: Vogtlandkreis , Saxony , Germany
Tributaries: Drive
Drain: Drive to the Pöhl dam
Larger places nearby: Neuensalz OT Thossfell
Pre-blocking Thossfell (Saxony)
Pre-lock Thossfell
Coordinates 50 ° 31 '2 "  N , 12 ° 14' 1"  E Coordinates: 50 ° 31 '2 "  N , 12 ° 14' 1"  E
Data on the structure
Construction time: 1961-1965
Height above valley floor: 14 m
Height above foundation level : 21 m
Height of the structure crown: 378  m above sea level NN
Building volume: 9 100  m³
Crown length: 154 m
Crown width: 2 m
Data on the reservoir
Altitude (at congestion destination ) 375.05  m above sea level NN
Water surface 33 ha
Storage space 1.23 million m³
Total storage space : 1.97 million m³
Catchment area 104.9 km²
Design flood : 130 m³ / s

The Vorsperre Thoßfell is one of two pre-dams of Pohl dam . The barrier structure is a prestressed concrete dam in the valley of the Trieb .

Dam wall

The dam is a straight, slim 21 m high gravity dam that is anchored to the ground with tendons according to plan , a construction method that is unique in Germany. Otherwise there are only a few gravity dams that were subsequently reinforced with the help of prestressing anchors.

Dam of the Thossfell barrier

At the level of the dam target, the dam has two large passages in the middle, which serve as overflow and flood relief . As a rule, the pre-lock is blocked until it is completely blocked and it is allowed to overflow. A bottom outlet is available for emergencies or for the purpose of lowering.

The second, smaller Neuensalz pre-barrier is built in the same way, but has only one overflow. Both dams are dammed from the air side by the Pöhl dam. Only at low water in the dam Poehl are stilling basin to see.

Recreational sports are possible on the Pöhl reservoir up to the two pre-barriers, but not in the pre-barriers themselves.

See also


  • Hans-Ulrich Sieber: Dams in Saxony, 1992.

Web links