Alfsee, Recreational reservoir in Osnabrück district, Germany.
Alfsee is a reservoir in the Osnabrück district of Lower Saxony with shallow water and roughly 7 kilometers of shoreline. The body of water covers an area of about 2.2 square kilometers and maintains a uniform depth of around 2 meters.
The 1964 General Plan for water regulation in the Hase area first proposed a flood retention basin near Alfhausen and Rieste. Construction began in 1970 with clearing and dike work; the overflow sill and outlet were built in 1974, the Sögeln distribution structure in 1980 and the ring dike in 1981. The first test impoundment came in spring 1981 during a storm flood, and regular flooding of the Hase ceased in the early 1980s.
The lake is named after Alfhausen, the parish holding about 95 percent of its surface; the eastern bay belongs to Rieste. From 1976 a holiday park with holiday homes, campsites, sports pitches and a boating harbour with sailing school and waterskiing area was built on the eastern shore in Rieste. Anglers come for tench.
The B68 federal road and A1 motorway lie nearby, making car access straightforward from regional towns. Rieste train station offers hourly connections for travelers arriving without a vehicle.
An artificial channel about 4.5 kilometers (2.8 miles) long carries water from the Hase River into the lake and regulates large volumes. The system can handle up to 20 million cubic meters of water flow.
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