Case study:Herinrichting beekdal Tongelreep

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Location: 51° 23' 52.46" N, 5° 28' 51.23" E

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Project overview

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Status	Complete
Project web site	http://rhk.maps.arcgis.com/apps/MapSeries/index.html?appid=b9cf56c10d7f4d1db891cecec33d1d96
Themes	Environmental flows and water resources, Fisheries, Habitat and biodiversity, Hydromorphology
Country	Netherlands
Main contact forename	Ineke
Main contact surname	Barten
Main contact user ID
Contact organisation	STOWA
Contact organisation web site	http://www.stowa.nl/contact
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Tongelreep enters the Netherlands at the Achelse Kluis and then flows into the river Dommel near Eindhoven. The Tongelreep is part of the Dommel catchment. Since the 1990s, stream restoration measures were taken to allow the river more space to meander after it had previously, in the past century, been straightened for a faster discharges. As a result of this straightening, parts of woodland, moors and wetlands were at risk of drying out. In addition to these traditional restoration measures, Building with Nature measure were implemented. The Tongelreep is the only Dutch stream where, for building with Nature purposes, gravel beds were introduced near Aalst in addition to dead wood patches. This was done to enrich the stream flora and fauna.

Monitoring surveys and results

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Water depth, flow velocity and substrate cover were measured four times in 2016/2017. In addition, the position of the gravel beds was measured twice per year in the years 2015, 2016 and 2017. These measurements also revealed limited sedimentation, which was 80% gravel in late 2017. The gravel areas moved by on average 1.0m (+/- 0.3m), indicating that they mostly remained in place over a five year period. After the introduction of gravel beds, total species abundance and the number of species typical for an R5-type stream both increased significantly.

Source: http://edepot.wur.nl/468347

Lessons learnt

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These measurements show the potential of stimulating the origination of gravel beds. Actively introducing gravel would be a technological approach, which may be undesirable. If gravel is already naturally present in the stream, extra gravel may be added, but otherwise, a Building with Nature approach is considered more desirable.

Flow velocity variation can also be stimulated by main channel mowing or by introducing dead wood. When there is insufficient space for these natural measures, (as is the case for the Tongelreep), introducing gravel is an option. Providing sufficient shade over the gravel area is important.

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 Meuse River basin Maas Subcatchment River name Dommel Area category 1000 - 10000 km² Area (km2) 18001,800 km² <br />180,000 ha <br /> Maximum altitude category Less than 100 m Maximum altitude (m) 7777 m <br />0.077 km <br />7,700 cm <br /> Dominant geology Siliceous Ecoregion Western Plains Dominant land cover Grassland, Intensive agriculture (arable), Broadleaf/mixed woodland (semi natural), Moorland/heathland, Urban Waterbody ID NL_99_6_BO_BE_2 Other case studies in this subcatchment: Beekherstel Beekloop BmN, Beekherstel Keersop, Beekherstel Reusel Baarschot-Diessen, Boven-Dommel, Buulder Aa, Grote Aa, Kleine Aa, traject Smalwater Noord, Kleine Beerze Site Edit site Name Valkenswaard WFD water body codes NL27_T_1_2 WFD (national) typology R5 WFD water body name Pre-project morphology Natuurlijk Reference morphology R5 Desired post project morphology Heavily modified water body No National/international site designation Netherlands - Natuurbeschermingswet Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Langzaamstromende middenloop + benedenloop op zand Dominant substrate Zand River corridor land use Natuur Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) 0.750.75 m <br />7.5e-4 km <br />75 cm <br /> Mean discharge category 0.1 - 1.0 m³/s Mean annual discharge (m3/s) 0.07- 0.28"-0.28" is not declared as a valid unit of measurement for this property. Average channel gradient category Less than 0.001 Average channel gradient 0.0066 Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 17001,700 m <br />1.7 km <br />170,000 cm <br /> Project started 2007/01/01 Works started 2007/01/01 Works completed 2014/01/01 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 1 - 10 k€ Waterschap De Dommel Monitoring Waterschap De Dommel Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project KRW richtlijnen, verbeteren van de ecologie Measures Edit Measures Structural measures Bank/bed modifications Dood hout, Grind bedden Floodplain / River corridor Planform / Channel pattern Other Bouwen met Natuur 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 Width & depth variation Yes Yes Yes Yes No Improvement Flow velocities Yes Yes Yes Yes No Improvement Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Macrophytes Yes Yes Yes Yes No Improvement Fish Yes Yes Yes Yes No Improvement 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 Nutrient concentrations Yes Yes Yes Yes No Improvement PH Yes Yes Yes No No No change Salinity Yes Yes Yes Yes No No change Oxygen balance Yes Yes Yes Yes No No change Temperature Yes Yes Yes Yes No No change Specific synthetic pollutants Yes Yes No Yes No Improvement 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