Ehringen flood retention basin
| Ehringen flood retention basin | |||||||||
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| Coordinates | 51 ° 22 '31 " N , 9 ° 9' 57" E | ||||||||
| Data on the structure | |||||||||
| Construction time: | 2006-2008 | ||||||||
| Height above valley floor: | 7.3 m | ||||||||
| Height above foundation level : | 10.0 m | ||||||||
| Building volume: | 40,000 m³ | ||||||||
| Crown length: | 220 m | ||||||||
| Crown width: | 4.50 m | ||||||||
| Base width: | 55 m | ||||||||
| Slope slope on the air side : | 1: 2.5 | ||||||||
| Slope slope on the water side : | 1: 2.5 | ||||||||
| Data on the reservoir | |||||||||
| Altitude (at congestion destination ) | approx. 210 m above sea level NHN | ||||||||
| Water surface | 37.6 ha | ||||||||
| Total storage space : | 1.43 million m³ | ||||||||
| Catchment area | 122 km² | ||||||||
| Design flood : | 89 m³ / s | ||||||||
The Ehringen flood retention basin is a flood retention basin on the Erpe near Ehringen in the northern Hessian district of Waldeck-Frankenberg with small foothills at full damming in the Kassel district . It serves to protect Ehringen from flooding and the town of Volkmarsen below it .
Geographical location
The basin is located above Ehringen, a south-eastern district of Volkmarsen . Its dam is around 400 m southeast of the upper village exit ( Kreisstraße 11; Ehringen− Niederelsungen ), a few meters west or below the confluence of the Dase coming from Niederelsungen with the Twiste tributary Erpe flowing from Wolfhagen . A few meters west of the dam runs between Ehringen in the north and Wolfhagen in the south, the Volkmarsen – Vellmar-Obervellmar railway over the Erpe . The western border of the Kassel district and the north-western border of the Habichtswald Nature Park run east of the basin, the water surface of which extends into both when the water level is high. Near the southern foothills of the basin, on the Erpe, there is the urban wasteland Landsberg on the left and the castle ruins Rodersen on the right .
history
Since Ehringen in particular has been hit by seven heavy floods from Erpe and Dase since the 1950s , remedial action had to be taken. After the heavy flooding of 1965, not only the construction of the Twiste , but also the "Erpe Dam", which was never built, was planned. It should be built shortly after the Twist dam and have around 5.6 million m³ of total storage space with around 1.7 million m³ of permanent storage space, resulting in around 3.9 million m³ as a flood protection area . This was not realized due to difficult subsurface conditions.
After this and other plans were rejected, there was another heavy flood in 2002. Then it was decided to build a dam for the "Ehringen flood retention basin". The groundbreaking ceremony took place on September 29, 2006. No flooding endangered the construction work. The inauguration took place on October 17, 2008, an "open day" on October 18, 2008.
Dam with outlet structure
The dam is 220 m long and 10 m high at its crown, just as high as the neighboring railway embankment, and 55 m wide at the base. It has around 40,000 m³ building volume made of poured red clay , the only formation of the Upper Buntsandstein , and its slope is 1: 2.5 on the air and water sides.
An approximately 51 m long outlet structure made of reinforced concrete was integrated into the dam, including floor slabs, side walls, central pillars, front wall, dam beams , bridge slabs, service outlet and flood relief system. A total of 2,200 m³ of concrete and 230 t of reinforcing steel were used for this. In the inlet area, numerous oak posts were placed in concrete quivers to hold back flotsam. At the foot of the dam on the air side, an operating building with monitoring and control devices was erected near the outlet structure.
Flood retention basin
The flood retention basin has 1.43 million m³ total or flood protection area, which should cover a 75-year flood; In future, however, the effects of a 100-year flood (HQ 100 ) can also be mitigated with a design flood of 89 m³ / s. The storage space is designed for a precipitation or catchment area of around 122 km² , three quarters of which is accounted for by the Erpe river basin and one quarter by that of the Dase. The maximum flooded flood retention area is around 37.6 ha. The target is just under 210 m above sea level. NHN .
Work on rivers and infrastructure
During the construction of the dam, the section of the Erpe river in the dam area was slightly redesigned, with some bushes removed and trees cut, the access road to and with the parking lot at the company building created and several walking and hiking trails, one of which also leads over the dam, changed and widened had to.
Individual evidence
- ↑ a b c d e f g h i j k l m n o p q r s t u v w x y z flood retention basin Ehringen , on wasserverband-diemel.de
- ↑ a b c d e Ehringen flood retention basin , on wald-corbe.de
- ↑ a b c Ehringen flood retention basin ( Memento of the original dated January 3, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. (etc.), on hermanns.de (PDF; p. 21; 1.73 MB)
