Case study:Boldersbeek

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Location: 52° 0' 6.69" N, 6° 46' 33.76" 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, Water quality
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
Parent multi-site project	Building with nature measures in streams
This is a parent project encompassing the following projects	No

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Project summary

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The Boldersbeek is a small tributary of the Groenlose Slinge. In 1999, two retention basins were created in this stream's catchment. The stream flows through one of these basins and next to the other basin.

Monitoring surveys and results

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The ecology of the main stream has improved, but bank vegetation did not respond as intended. The banks turned out to be too narrow and too steep, leaving very little room for an adapted vegetation to develop. The retention basins are prone to getting filled in with vegetation and sediment. They require a lot of maintenance just to prevent them from turning into carrs (Dutch: elzenbroekbos) through plant succession. This makes the basins less suitable for water retention. However, some of the carrs that have started to grow are in fact desirable and contribute to a more varied landscape.

Lessons learnt

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Researchers of Alterra (now Wageningen Environmental Research) state that the basins would not have ondergone such rapid plant succession if they had been made a bit deeper.

Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Boldersbeek WFD water body codes NL07_0020 WFD (national) typology R5 WFD water body name Groenlose Slinge Pre-project morphology Actively meandering Reference morphology Straightened Desired post project morphology Actively meandering 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 Dominant substrate Sand River corridor land use Intensive agriculture (arable), Grassland Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category 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 Edit project background Reach length directly affected (m) 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 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor 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 Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative 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 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 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