Case study:Wold Aa

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Location: 52° 44' 29.05" N, 6° 18' 40.45" E

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Water quality
Country	Netherlands
Main contact forename	Sander
Main contact surname	Verheijen
Main contact user ID
Contact organisation	Waterschap Drents Overijsselse Delta
Contact organisation web site	http://www.wdodelta.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 Water Authority Drents Overijsselse Delta tried to increase the flow velocity in this stream to improve aquatic ecology and meet WFD criteria. Weed-cutting was limited to the main channel and the stream was divided into a blue and a green zone. The blue zone was regularly maintained to ensure flow continuity, while the green zone was maintained less often.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Wold Aa WFD water body codes NL35_Wold_Aa WFD (national) typology R5 WFD water body name Wold Aa Pre-project morphology Straightened Reference morphology Actively meandering Desired post project morphology Straightened 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 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