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 measure in streams
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, in various forms: branches, stubs and trunks.

Monitoring surveys and results

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There is an undeniable positive effect on stream ecology, with macroinvertebrates 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 and are confined to the natural areas.

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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 Meuse River basin Maas Subcatchment River name Mark Area category 100 - 1000 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) Dominant geology Siliceous Ecoregion Western Plains Dominant land cover Intensive agriculture (arable), Grassland, Broadleaf/mixed woodland (semi natural) Waterbody ID NL25_13 Other case studies in this subcatchment: 't Merkske, Bijloop Site Edit site Name 't Merkske WFD water body codes NL25-62 WFD (national) typology R4a WFD water body name Merkske Pre-project morphology Actively meandering Reference morphology Actively meandering Desired post project morphology Actively meandering Heavily modified water body No 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 Broadleaf/mixed woodland (semi natural) Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category 0.1 - 1.0 m³/s 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