Arlau
| Arlau | ||
 Arlau, just behind the sewer , where it in the Beltringharder Koog flows |
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| Data | ||
| Water code | DE : 9552 | |
| location | District of North Friesland , Schleswig-Holstein , Germany | |
| River system | Arlau | |
| River basin district | Eider | |
| source | southeast of Sollwitt 54 ° 34 ′ 47 " N , 9 ° 15 ′ 4" E |
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| Source height | 8 m | |
| muzzle | after crossing the Beltringharder Kooges on Holmer Siel in the North Sea Coordinates: 54 ° 31 ′ 41 ″ N , 8 ° 52 ′ 19 ″ E 54 ° 31 ′ 41 ″ N , 8 ° 52 ′ 19 ″ E
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| length | 37 km | |
| Reservoirs flowed through | Arlau reservoir in the Beltringharder Koog | |
| Communities | Behrendorf , Bondelum , Viöl , Arlewatt , Hattstedtermarsch | |
The Arlau (Danish: Arlå ) is a 37 km long river in the district of North Friesland in Schleswig-Holstein , which flows into the North Sea and belongs to the Eider river basin district .
course
The Arlau rises southeast of Sollwitt in North Frisia . It divides the goesharde into north and south goesharde. Initially, it flows a few kilometers south and runs along the municipal boundary between Behrendorf and Bondelum . About 3 km southeast of Behrendorf its course changes in a westerly direction. The Arlau then flows south past Viöl and north past Arlewatt , crosses the Hattstedtermarsch , and finally flows into the North Sea at Beltringharder Koog on Holmer Siel .
Hydraulic engineering in the estuary
The runoff into the North Sea is regulated by a sluice and the Arlau reservoir in front of it in Beltringsharder-Koog. The two hydraulic engineering systems also protect the inhabited low-lying hinterland of the Hattstedtermarsch from the ingress of North Sea water during a storm surge . The storage basin makes an additional pumping station on Holmer Siel - in contrast to the old Arlau lock in the Hattstedtermarsch - superfluous.
Tributaries
The Arlau receiving waters are:
- Gramsholmer Bek ,
- Imme ,
- Eckstockau ,
- Ahrenhöfter Graben ,
- Ostenau ,
- Bredstedter Bach ,
- Jelstrom ,
- Grenzau .
The Holmer Siel on the outer dike of the Beltringharder Koog
The lock system of the Arlau in the dike of the Hattstedter Neuen Kooges
The Arlau at the estuary of the Ostenau (coming from the left)
