Case study:Aaijen- Removal of bank fixation

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Location: 51° 34' 51.60" N, 6° 2' 25.80" E

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Monitoring, Water quality
Country	Netherlands
Main contact forename	Frans
Main contact surname	Kerkum
Main contact user ID
Contact organisation	Rijkswaterstaat Waterdienst
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this subcatchment)

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: Meers - Floodplain lowering, Reméandration du Geer à Grand-Axhe, Rijkelse Bemden - River bed widening, Voorste Nete at Dessel

Site

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Name	Aijen
WFD water body codes
WFD (national) typology	R7
WFD water body name
Pre-project morphology	Straight, High width:depth
Reference morphology	Single channel, Sinuous
Desired post project morphology
Heavily modified water body	true
National/international site designation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate	Silt, Sand
River corridor land use	Urban, Intensive agriculture
Average bankfull channel width category	10 - 50 m
Average bankfull channel width (m)
Average bankfull channel depth category	5 - 10 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	400 m0.4 km <br />40,000 cm <br />
Project started	2005/01/01
Works started	2005/01/01
Works completed	2006/01/01
Project completed
Total cost category	50 - 100 k€
Total cost (k€)	74 k€74,000 € <br />
Benefit to cost ratio
Funding sources

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology	Continuity for organisms
Biology	Macrophytes, Invertebrates: Taxonomic composition, Invertebrates: Abundance
Physico-chemical
Other reasons for the project	Landscape enhancement, Nature development, Flood risk management, Bank erosion

Measures

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Structural measures
Bank/bed modifications	Removal of bank fixation to aid natural erosion
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other

Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Continuity for organisms	Yes	Yes		Yes		Improvement

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Macrophytes		Yes		Yes		Improvement
Invertebrates: Taxonomic composition		Yes				Improvement
Invertebrates: Abundance

Physico-chemical quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Any other monitoring, e.g. social, economic

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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