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Switzerland
In Switzerland below elevations of 600 m 46 % of watercourses are heavily impacted in terms of structural diversity and there are about 101 000 artificial barriers with a height difference of more than 0.5 m (FOEN, 2010).
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See case-study text in comment on Chapter 4.2.5
A longer version of the text is found in the Swiss State of Environment Report 2011, Chapter 9: http://www.bafu.admin.ch/umwelt/10822/10823/index.html?lang=en
"Up to now, 14,000 km or 22 % of the Swiss surface water network ( scale 1:25 000 ) have been altered appreciably through structural interven-tion ( » G9.1 ), and 100,000 artifi cial obstacles with a drop in excess of 0.5 m have been built. Approximately 10,800kilometres of rivers and streams in Switzerland are in need of remediation ( » foen2009f )", referring to the complete study: http://www.bafu.admin.ch/publikationen/publikation/01075/index.html?lang=de (in german and french only)