Rennersdorf flood retention basin
| Rennersdorf flood retention basin | |||||||||
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| Coordinates | 51 ° 0 '43 " N , 14 ° 46' 39" E | ||||||||
| Data on the structure | |||||||||
| Lock type: | Rockfall dam | ||||||||
| Construction time: | 2006-2010 | ||||||||
| Height above valley floor: | 15 m | ||||||||
| Height above foundation level : | 17 m | ||||||||
| Height of the structure crown: | 279.5 m | ||||||||
| Building volume: | 160 000 m³ | ||||||||
| Crown length: | 260 m | ||||||||
| Crown width: | 5 m | ||||||||
| Slope slope on the air side : | 1: 2.2 | ||||||||
| Slope slope on the water side : | 1: 2.4 | ||||||||
| Operator: | State dam administration of Saxony | ||||||||
| Data on the reservoir | |||||||||
| Altitude (at congestion destination ) | 277.8 m | ||||||||
| Water surface | 44 ha | ||||||||
| Storage space | 2.2 million m³ | ||||||||
| Total storage space : | 3.6 million m³ | ||||||||
| Catchment area | 63.5 km² | ||||||||
| Design flood : | 310 m³ / s | ||||||||
The Rennersdorf flood retention basin is located south of Rennersdorf in Upper Lusatia between Bernstadt auf dem Eigen , Herrnhut and Großhennersdorf in the Görlitz district (Saxony). The retention basin of the state dam administration of Saxony is intended to protect the Pließnitz river basin from flooding by regulating the flow rate of its longest source river, the Petersbach .
description
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The reservoir is only dammed in the event of a flood. It will be able to hold back up to 3.5 million m³ of water. In addition to the Petersbach, the tributaries include the Erlichtbach and the Triebenbach . The catchment area is approx. 64 km². In Rennersdorf, below the dam, the Berthelsdorfer Wasser merges with the Petersbach to Pließnitz.
The first construction phase was completed in January 2009. Construction of the actual 300 m long and 16 m high main dam began in December 2009. After four years of construction, the flood retention basin was completed and officially inaugurated on December 8, 2010 in the presence of the Environment Minister Kupfer. In a Ökostollen walk- dam is a rockfill dam with a bituminous core gasket that is wide at the crown of about five meters. The construction costs amounted to 38 million euros.
At the beginning of 2011, the flood retention basin had to be dammed unexpectedly due to a melt flood. During this compulsory impoundment, it was found that a considerable amount of seepage water leaked from the control drainage. The evaluations and research into the cause began immediately afterwards. Additional boreholes were initiated and a scheduled damming test was carried out in which the quantities of seepage water were precisely recorded.
The renovation of the pool began in 2013. The dam received an additional seal on the water side. This was drawn in front of the asphalt seal and extends at least five meters into the ground. This is intended to reduce the amount of seepage water on the air side of the dam. The inner seal was installed using the so-called CSM process (Cutter Soil Mixing). The soil is mixed with a cement suspension. This creates a dense earth-concrete wall.
See also
Footnotes
- ↑ Rennersdorf flood retention basin: first construction phase completed. Retrieved January 22, 2009 .