Case study:Overijssels Kanaal

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Location: 52° 27' 53.78" N, 6° 13' 48.45" E

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Habitat and biodiversity, 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 Overijssels kanaal, Marswetering and Beentjesgraven are three roughly parallel waterways that discharge into the river IJssel. The water authority Drents Overijsselse Delta created more structural variation in these streams to improve their ecological quality and meet WFD criteria. The banks were divided into a green and a blue zone. In the blue zone, vegetation was regularly removed to ensure flow continuity. In the green zone, vegetation is removed less regulaly and in a way that contributes to a varied flow structure. In the Overijssels kanaal, reed is removed in the summer months. In the Marswetering, further efforts are planned to broaden the waterway and recreate meanders. Fish passages have been created in the Overijssels kanaal and Marswetering.

Monitoring surveys and results

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Vegetation development is monitored by FLORON. In the Overijssel kanaal, reed removal has created opportunities for the development of calamus and yellow iris. The overall ecological quality ratios of the three streams have improved. Macrofauna are monitored at 3-4 locations per stream.

Lessons learnt

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Overijssels Kanaal, Marswetering, Beentjesgraven WFD water body codes NL04_OVERIJSSELSKNL-ZWa; NL04_MARS-WETERING; NL04_BEENTJESGRAVEN; WFD (national) typology M6a; R5; M1a WFD water body name Overijssels Kanaal Zwolle; Marswetering; Beentjesgraven Pre-project morphology Channels and channeled, embanked, regulated waterways 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 Dominant substrate 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