Schiedersee
| Emmer reservoir | |||||||||
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| Coordinates | 51 ° 55 '25 " N , 9 ° 9' 57" E | ||||||||
| Data on the structure | |||||||||
| Construction time: | -1983 | ||||||||
| Height above foundation level : | 10 m | ||||||||
| Crown length: | 470 m | ||||||||
| Data on the reservoir | |||||||||
| Storage space | 3.86 million m³ | ||||||||
The Schiedersee or Emmerstausee is a reservoir on the Emmer . It is located near the town of Schieder-Schwalenberg in the Weser Uplands in the Lippe district ( North Rhine-Westphalia ).
description
The length of the lake is about 3.1 km and the width up to 350 m. The average water depth only exceeds two meters in the eastern area.
The lake was laid out in the late 1970s and completed as a recreational area in the early 1980s . In addition to the tourist incentives, flood protection was one of the main reasons for building the lake. Due to the flood retention, the city of Lügde , located below the lake, is better able to take necessary protective measures such as the dumping of dams for a certain period of time. The historic city center of Lügde has not been flooded since the lake was completed, but the outskirts were still affected by the floods in 1986 and 1998.
A hydropower plant was installed on the dam, but has since been taken out of service. In order not to prevent river fish from migrating, a fish ladder was integrated into this project .
Use as a recreational area
Today several water sports clubs have their headquarters at the lake; in particular, sailing and rowing can be practiced. The water is visited by many guests, especially in the summer months. On the lake, a private motor ship called the SchiederSee travels at a fixed pace between the various tourist destinations. There is also a commercial leisure center there. There is a guard station of the German Life Saving Society (DLRG) by the lake .
The leisure center at Emmerstausee is to be sold to a private investor / operator. The owner is EHZ - Erholungszentrum Schieder GmbH . The shareholders are the district of Lippe (6/7) and the city of Schieder-Schwalenberg (1/7).
Siltation
Already during the construction phase there were voices that predicted siltation of the lake; the lake was created in its current form. Because of the constant input of sediment from the Emmer, the lake had to be dredged regularly. For years, people have repeatedly considered whether the lake should silt up better and thus develop naturally. To prevent river sediments from entering the lake, a flood was built by 2015 to divert the Emmer stream north past the lake. As a result, the Emmersee is now only three quarters of its original size.
Flood
The construction work to flood the Emmer around the Schiedersee began on April 18, 2012 and was completed in June 2015. The Emmer is led past the Schiedersee by a separating dam, flows through a crossing structure at the dam of the lake and reaches the lower reaches of the Emmer via a sole slide.
In the summer of 2012, a 12-meter-wide and 0.3-meter-thick leveling layer made of gravel was laid to support the later separation dam. The leveling layer was covered with a geotextile to prevent the separating dam from being washed under. The geotextile was fixed with rock material. The separating dam consists of a continuous steel sheet pile wall, which was provided with stone fill on both sides. In December 2012, the installation of the steel sheet pile wall began, with a bit of time lag, a rock fill was placed on both sides of the sheet pile wall. In October 2013, the separation dam was completed, apart from a few remaining works.
The bottom slide below the dam must bridge the height difference of around 4 meters between the bottom of the flood at the dam and the confluence with the Emmer so that aquatic animals can migrate through the bottom slide. The sole slider was manufactured from August 2013 to November 2013.
The crossing structure was built from July 2014 to April 2015. The discharge of the Emmer can be controlled with a protective board.
To compensate for evaporation and infiltration losses in the Schiedersee, part of the runoff from the Niese is channeled into the lake. The partial flow of the Niese crosses three reed basins before reaching the Schiedersee. Suspended solids are supposed to settle in the reed basins. The pools were laid out in summer 2014 and have a total area of 5500 square meters. If the inflow from the Niese into the Schiedersee is too low to keep the water level in the Schiedersee high enough, a pumping station can pump water from the Emmer directly into the lake. The pumping capacity is 120 liters per second.
The construction costs amounted to around 13 million euros, 80 percent of which were borne by the state of North Rhine-Westphalia.
See also
Web links
- Emmertalsperre
- Dams directory NRW (PDF; 122 kB)
- Water level at the Schieder-Nessenberg gauge
- Dams in North Rhine-Westphalia; State Environment Agency NRW (PDF; 124 kB)
- SchiederSee leisure center
Individual evidence
- ↑ Manfred Brinkmeier: No Heidepark Soltau should be built here. Lippische Landeszeitung, May 17, 2012, accessed on January 31, 2016 .
- ↑ a b Emmer-Umflut is ready. nw.de, June 15, 2015, accessed on September 17, 2016 .
- ↑ sod 2012. kreis-lippe.de, accessed on 17 September 2016 .
- ↑ Construction of the separating dam. Kreis-lippe.de, accessed on September 17, 2016 .
- ↑ Creation of sole sliding. Kreis-lippe.de, accessed on September 17, 2016 .
- ↑ Creation of a crossing structure. Kreis-lippe.de, accessed on September 17, 2016 .
- ↑ Creation of the lake feed. Kreis-lippe.de, accessed on September 17, 2016 .
- ↑ Emmer-Umflut is ready. nw.de, June 15, 2015, accessed on September 17, 2016 .