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Skjern River
Skjern River ((デンマーク語:Skjern Å)) is the largest river in Denmark, in terms of volume. The river drains about one tenth of Denmark and discharges 206 m³/s (89,100 ft³/s) of water into the Ringkøbing Fjord - a lagoon and former bay of the North Sea. The river has its name from town of Skjern, located at the river delta (the only river delta in the country) at Ringkøbing Fjord.
In the 1960s, the Danish government began straightening the rivers run and drain the extensive wetlands that had formed around the river mouth, to prevent the frequent floodings and allow for intensive farming in the region. However, the plan backfired. Without the frequent sediment deposits supplied by floodings, increased chemical fertilizers and nutrients were needed to sustain a productive agriculture and the river, unable to spread the sediment across a wide wetland, silted up in many places. Furthermore, the land began to sink as it dried out and ceased to be replenished with fresh sediment. The slow sinking of the land, made the drainage infrastructure increasingly ineffective.
By 1987, the government decided to implement a program of land rehabilitation to restore the river to a more natural state. Though the plan was not completed and approved until 1997, by 2002, the work was mostly completed. Much of the river and wetland are now protected area, home to a variety of wildlife, including otters, Atlantic salmon and a variety of waterbirds. Tourism and traditional cattle grazing, have replaced the intensive agriculture as the primary economic use of the land.
==Sources==
* Ecological Engineering 2007 (Morten Lauge Pedersen ''et al.''): (Restoration of Skjern River and its valley—Short-term effects on river habitats, macrophytes and macroinvertebrates ) ''Department of Freshwater Ecology'', National Environmental Research Institute.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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