Case study:Reest

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Location: 52° 39' 59.74" N, 6° 18' 19.29" 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
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 in streams
This is a parent project encompassing the following projects	No

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Project summary

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The Reest is a slow-flowing stream on a peat substrate that meanders over its full length, which is quite uncommon for Dutch streams. Stream restoration measures in the Reest aim to restore the hydrological conditions in the stream valley. The goal is to decrease the drainage capacity of the stream, leading to higher minimum groundwater levels in summer and increased seepage into the valley. This is supposed to improve the ecological potential for aquatic plants, invertebrates and fish. The surrounding valley should become better suited to support wet grassland. To this end, three 50-meter-long stretches have been lined with dead tree stubs. In addition, sand was deposited in the stream, raising the streambed by 50 cm. Finally, several barriers were created from tree trunks and rocks.

Monitoring surveys and results

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Extensive groundwater monitoring shows that the upstream groundwater level is rising, which was the intended effect of the measures taken. Locally, the stream is becoming significantly narrower due to vegetation growth in the treated areas. The measures have not been in effect long enough to draw conclusions about the effect on macroinvertebrates and fish.

Lessons learnt

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Water board Drents Overijsselse Delta observes that it is important to plan and time maintenance well and to communicate well with water managers. Most notably, the developing vegetation caused the water to smell when water levels were high, so that weeds had to be cut along the entire stream.

Image gallery

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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 Rijn River basin Rijndelta Subcatchment River name Vecht Area category 1000 - 10000 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) Dominant geology Siliceous, Organic Ecoregion Central Plains Dominant land cover Grassland, Intensive agriculture (arable), Broadleaf/mixed woodland (semi natural) Waterbody ID NL36_OWM_014 Other case studies in this subcatchment: Beentjesgraven, Beneden Regge, De Doorbraak, Deurningerbeek, Dinkel Noord, Jufferbeek, Living Vechte-Dinkel, Marswetering, Midden Regge, Oude Bornschebeek... further results Site Edit site Name Reest WFD water body codes NL35_Reest WFD (national) typology R12 WFD water body name Reest Pre-project morphology Low gradient passively meandering Reference morphology Low gradient passively meandering Desired post project morphology Low gradient passively 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 Peat River corridor land use Intensive agriculture (arable), Rough unimproved grassland/pasture 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 Less than 0.001 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