Case study:Voorste Nete at Dessel

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Location: 51° 13' 55.80" N, 5° 9' 0.77" E

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Project overview

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Status	Complete
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

Upper row (left and right): original reach of the Voorste Nete. Middle row (left and right): Excavation of a 5 m wide stretch for placing the bentonite mat and refilling with the original sand. Bottom row (left and right): Diverted reach of the Voorste Nete, dug out in sand filled bentonite lining with transferred substrate from the original reach, and the same stretch 6 months later during first monitoring showing the changes in dimensions caused by a summer storm in 2004.

Project summary

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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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Catchment

River basin district	Meuse
River basin	Meuse

Subcatchment

River name	Meuse
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

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Name	Voorste Nete
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)
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Average channel gradient
Average unit stream power (W/m2)

Project background

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Cost for project phases

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Reasons for river restoration

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Mitigation of a pressure
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Measures

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Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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quality elements

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Supplementary Information

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