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Good practice Imported

Thur River Rewidening — Restoring Floodplain Dynamics Near Niederneunforn, Switzerland

Switzerland · Niederneunforn · See the Switzerland profile

Evidence: Observational / pre–post Top 33% 53/100 · Ask Evidence Copilot about this practice

In 2002 Swiss authorities removed about 1 km of embankments on the Thur River near Niederneunforn, letting the channel widen naturally; peer-reviewed monitoring documents recovering gravel-bar dynamics under a national law mandating 4,000 km of river restoration by 2090.

~1 km
Embankment removed (2002)
4,000 km by 2090
National restoration target under Water Protection Act
Thur River Rewidening — Restoring Floodplain Dynamics Near Niederneunforn, Switzerland

Details

Maturity
Established
Promoter
Canton of Thurgau, with the Swiss Federal Office for the Environment (BAFU)
Period
2002-present
Region (NUTS)
CH05
Keywords
river restoration, floodplain management, biodiversity, flood risk reduction, hydromorphology

Context

The Thur, a 127 km Rhine tributary, was progressively straightened and leveed for flood control and farmland, losing natural erosion-deposition dynamics.

Activities

In the 1990s lateral rip-rap was first removed to let gravel bars re-form; in 2002 a roughly 1 km stretch of embankment near Niederneunforn and Altikon was removed on both banks, with wood structures added to encourage braiding.

Results

Peer-reviewed monitoring published in Water (MDPI, 2018) documents renewed gravel-bar formation, secondary-channel development, and greater instream and terrestrial habitat diversity at the restored reach.

Conclusions

Switzerland's 2011 Water Protection Act revision made ecological river restoration a legal obligation nationwide (target: 4,000 km restored by 2090); unlike more intensively monitored sites, published Thur results emphasise morphological and habitat proxies rather than long-run species-count time series, and no site-specific cost figure was found.

Implementation
Indicative cost
Low (< €50k)
Time to results
Long (> 3 years)
Staffing & skills
Canton of Thurgau, Swiss Federal Office for the Environment (BAFU), Eawag (federal aquatic research institute)

Conditions for success

  • legal mandate under the revised Water Protection Act
  • peer-reviewed long-term monitoring coordinated with Eawag

Common failure modes

  • no site-specific cost figure published
  • results documented via morphological/habitat proxies rather than long-run species counts

Commonly funded by

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Data sources

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