Case study:'t Merkske

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Location: 51° 25' 4.63" N, 4° 50' 29.21" E

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Project overview

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Status	In progress
Project web site
Themes	Environmental flows and water resources, Habitat and biodiversity, Hydromorphology, Monitoring, Water quality
Country	Belgium, Netherlands
Main contact forename	Martin
Main contact surname	Stamhuis
Main contact user ID
Contact organisation	Waterschap Brabantse Delta
Contact organisation web site	http://www.brabantsedelta.nl
Partner organisations
Parent multi-site project	Building with Nature
This is a parent project encompassing the following projects	No

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Project summary

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Het Merkske is a river in a southern tip of the Dutch province Noord-Brabant and forms part of the border with Belgium. This area has an important ecological function and is home to large numbers of river animals. Further improvement of the river's ecological quality has been pursued through Building with Nature measures. Regular maintenance of the river's edges has been suspended so that branches and fallen trees remain in or near the stream, as long as this does not impede the flow too much. Additonally, dead wood has been introduced at fifteen locations.

Monitoring surveys and results

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There is an undeniable positive effect on stream ecology, with macrofauna conforming to a Good Ecological Status. In 2018, the number of fish was still lower than would be expected for a stream with a Good Ecological Status. Local backwater effects have been observed, with water levels locally rising about 5 cm. These effects quickly diminish in the upstream direction.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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