Case study:Voorste Nete at Dessel
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Project overview
Status | Complete |
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Project web site | |
Themes | Fisheries, Habitat and biodiversity, Hydromorphology, Monitoring |
Country | Belgium |
Main contact forename | Nick |
Main contact surname | Elbourne |
Main contact user ID | User:NickRRC |
Contact organisation | River Restoration Centre |
Contact organisation web site | http://www.therrc.co.uk |
Partner organisations | University Hasselt, Centre for Environmental Sciences, Diepenbeek |
Parent multi-site project | |
This is a parent project encompassing the following projects |
No |
Project summary
In 2004 a reach of 1.3km of the small, channelized lowland brook, Voorste Nete, was diverted because of sand mining activities. The sinuosity of the newly created reach of the Voorste Nete, 1.9km in length, was based on old maps, aerial photography and field measurements. The new brook was hydrologically isolated with a bentonite mat preventing water loss due to a decline of the groundwater level. The sides of the bentonite were placed upright for 0.5m and the lining was filled with the original sand from digging out the new reach.
Originally the newly created streambed has a weak meandering channel pattern (sinuoscity 1.1), and was 1m wide at the bottom and 2m wide at the top. In August 2004, a summer storm caused severe erosion and had a noticeable impact on the profile. In the first three years, mechanical weed clearance was only conducted once in the upstream reach of the diversion in autumn 2005. In 2007, mechanical weed mowing was executed for the total stream.
Monitoring surveys and results
Lessons learnt
Catchment and subcatchment
Edit the catchment and subcatchment details
(affects all case studies in this subcatchment)
Catchment
River basin district | Meuse |
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River basin | Meuse |
Subcatchment
River name | Meuse |
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Area category | more than 10000 km² |
Area (km2) | 465465 km² <br />46,500 ha <br /> |
Maximum altitude category | 100 - 200 m |
Maximum altitude (m) | 200200 m <br />0.2 km <br />20,000 cm <br /> |
Dominant geology | chalk and loess |
Ecoregion | Western Plains |
Dominant land cover | Intensive agriculture, Urban |
Waterbody ID |
Other case studies in this subcatchment: Aaijen- Removal of bank fixation, Meers - Floodplain lowering, Reméandration du Geer à Grand-Axhe, Rijkelse Bemden - River bed widening
Site
Name | Voorste Nete |
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WFD water body codes | |
WFD (national) typology | |
WFD water body name | |
Pre-project morphology | |
Reference morphology | |
Desired post project morphology | |
Heavily modified water body | No |
National/international site designation | |
Local/regional site designations | |
Protected species present | Yes |
Invasive species present | No |
Species of interest | Spined loach, Three-spined stickelback, Nine-spined stickelback, Gudgeon, European eel (Anguilla anguilla) |
Dominant hydrology | |
Dominant substrate | |
River corridor land use | Intensive agriculture (arable) |
Average bankfull channel width category | 2 - 5 m |
Average bankfull channel width (m) | 22 m <br />0.002 km <br />200 cm <br /> |
Average bankfull channel depth category | |
Average bankfull channel depth (m) | |
Mean discharge category | 0.1 - 1.0 m³/s |
Mean annual discharge (m3/s) | |
Average channel gradient category | |
Average channel gradient | |
Average unit stream power (W/m2) |
Project background
Reach length directly affected (m) | |
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Project started | |
Works started | |
Works completed | |
Project completed | |
Total cost category | |
Total cost (k€) | |
Benefit to cost ratio | |
Funding sources |
Cost for project phases
Phase | cost category | cost exact (k€) | Lead organisation | Contact forename | Contact surname |
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Investigation and design | |||||
Stakeholder engagement and communication | |||||
Works and works supervision | |||||
Post-project management and maintenance | |||||
Monitoring |
Reasons for river restoration
Mitigation of a pressure | |
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Hydromorphology | |
Biology | |
Physico-chemical | |
Other reasons for the project |
Measures
Structural measures
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Bank/bed modifications | |
Floodplain / River corridor | |
Planform / Channel pattern | |
Other | |
Non-structural measures
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Management interventions | |
Social measures (incl. engagement) | |
Other |
Monitoring
Hydromorphological quality elements
Element | When monitored | Type of monitoring | Control site used | Result | ||
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Before measures | After measures | Qualitative | Quantitative |
Biological quality elements
Element | When monitored | Type of monitoring | Control site used | Result | ||
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Before measures | After measures | Qualitative | Quantitative |
Physico-chemical quality elements
Element | When monitored | Type of monitoring | Control site used | Result | ||
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Before measures | After measures | Qualitative | Quantitative |
Any other monitoring, e.g. social, economic
Element | When monitored | Type of monitoring | Control site used | Result | ||
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Before measures | After measures | Qualitative | Quantitative |
Monitoring documents
Image gallery
Additional documents and videos
Additional links and references
Link | Description |
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Supplementary Information
Edit Supplementary Information