Case study:Beekherstel Buurserbeek

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Location: 52° 8' 10.28" N, 6° 42' 34.15" E

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Flood risk management, Habitat and biodiversity, Monitoring
Country	Netherlands
Main contact forename	John
Main contact surname	Lenssen
Main contact user ID
Contact organisation	Waterschap Rijn en Ijssel
Contact organisation web site	http://www.wrij.nl/
Partner organisations	STOWA
Parent multi-site project	Building with Nature measures in streams
This is a parent project encompassing the following projects	No

Buurserbeek

Project summary

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The Buurserbeek is now a slow-flowing, strongly normalized stream. It is partially located in an agricultural area, but most of the stream flows through woods are natural areas (e.g. Buurserzand and the woods east of Haaksbergen) and/or has woody vegetation on its banks. A 4 meter wide maintenance path runs parallel to most of the stream and the entire stream runs between embankments or high grounds. Upstream of the Twenteroute, the stream carries water most of the year and in most places, the flow velocity is sufficient to support flow-loving fish. Downstream of the Twenteroute, the discharge mostly stops in summer, causing the stream to become stagnant. There is intensive maintenance in the reaches downstream of Braambrug. The Buurserbeek does not yet meet its ecological targets. The stream is too deep and has insufficient variation in structure. Nutrient levels remain to high in the Buurserbeek as well. This is mostly caused by upstream pollution in Germany.

The stream can meander freely within its embankments. The stream is shallow and wide and features both sand bars and stream pits, as well as dead wood and a local lush aquatic vegetation. Most of the stream corridor (80%) is wooded. The Buurserbeek is completely accessible to fish.

Water authority Rijn en IJssel introduced tree stems into the stream to replace the stone cascades that used to be there. In another stretch of the stream, a maintenance path was removed to make the stream wider and shallower.

Monitoring surveys and results

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The results of dead wood introduction are not yet known. It is clear, though, that they cannot function as cascades. The combined effect of the two measures described above is a greater structure variation and a faster base flow.

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Rijn River basin Rijndelta Subcatchment River name Schipbeek Area category 100 - 1000 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 2323 m <br />0.023 km <br />2,300 cm <br /> Dominant geology Siliceous Ecoregion Central Plains Dominant land cover Intensive agriculture (arable), Plantation forestry, Grassland Waterbody ID NL07_0028 Other case studies in this subcatchment: Beekherstel Zuidelijk Afwateringskanaal, Traditioneel Beekherstel Koffiegoot Site Edit site Name Buurserbeek WFD water body codes NL07_0029 WFD (national) typology R5 WFD water body name Pre-project morphology Sterk veranderend Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Artificially regulated Dominant substrate Sand, Musselkalk, dekzand/keileem River corridor land use Intensive agriculture (arable), Plantation forestry Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) 66 m <br />0.006 km <br />600 cm <br /> Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) 0.80.8 m <br />8.0e-4 km <br />80 cm <br /> Mean discharge category 1 - 10 m³/s Mean annual discharge (m3/s) 1.411.41 m³/s <br />1,410 l/s <br /> Average channel gradient category Less than 0.001 Average channel gradient 0.00074 Average unit stream power (W/m2) 8.27 * 10^-4 "*10^-4" is not declared as a valid unit of measurement for this property. Project background Edit project background Reach length directly affected (m) Project started 2015 Works started Works completed 2015/12/31 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 Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Barriers to fish migration Hydromorphology Flow velocities, Width & depth variation Biology Fish, Invertebrates Physico-chemical Temperature, PH, Oxygen balance, Nutrient concentrations Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Vergraven van de oever Floodplain / River corridor Dood hout inbreng Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Substrate conditions Yes Yes No No No Improvement Flow velocities Yes Yes No No No Improvement Width & depth variation Yes Yes No No No Improvement Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish Yes Yes No No No Improvement Invertebrates Yes Yes No No No Improvement Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Temperature Yes Yes No No No Improvement PH Yes Yes No No No Improvement Oxygen balance Yes Yes No No No Improvement Nutrient concentrations Yes Yes No No No Improvement Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Concentration phosphate, Chloride and Nitrogen Yes Yes No No No Improvement Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information