Case study:Kleine Aa, traject Smalwater Noord

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Location: 51° 35' 42.36" N, 5° 16' 35.87" E

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Project overview

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Status	Complete
Project web site	http://http://www.esschestroom.nl/index.php?pid=7&info=7
Themes	Habitat and biodiversity, Spatial planning
Country	Netherlands
Main contact forename	Rogier
Main contact surname	Vogelij
Main contact user ID
Contact organisation	Dienst Landelijk Gebied
Contact organisation web site	http://www.dienstlandelijkgebied.nl/en
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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Waterboard De Dommel in cooperation with Foundation Brabants Landschap (Brabant Landscape) have restored the watercourse Kleine Aa (Small Aa) to improve landscape and ecological values.

The southern portion of this stream was restored some years ago, and in September 2011 the northern part, the area between the railway Boxtel - Tilburg and the outlet in the Essche Stream, was restored. At the moment the project Kleine Aa in the final stages of completion as the second fish passage is contstructed downstream. The work will probably be completed by summer 2013.

Between Kapelweg and Helweg in Boxtel, the stream is restored over a length of 1.5 km. The result is a natural, narrow, brook that winds its way through the landscape. Two fish passage allow fish like the Bitter Roach, Chub and Ide, to swim again between the Essche stroom and the Beerze, at the spot where dams previously prevented this.

The use of rubble in this fishways improves the habitat of protected bullhead. Also amphibians will be more at home in the area thanks to the pools on the banks of the stream. The scenery along the water is varied, with flowery meadows, willows and elms.

A hiking trail now also allows hikers to explore the area, crossing the stream at a location where a crossing was historically.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Kleine Aa, traject Smalwater Noord WFD water body codes WFD (national) typology R5 WFD water body name Pre-project morphology Single channel 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 sand River corridor land use Improved/semi-improved grassland/pasture, Intensive agriculture (arable) Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) 7.77.7 m <br />0.0077 km <br />770 cm <br /> Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) 1.51.5 m <br />0.0015 km <br />150 cm <br /> Mean discharge category 1 - 10 m³/s Mean annual discharge (m3/s) 44 m³/s <br />4,000 l/s <br /> Average channel gradient category Less than 0.001 Average channel gradient 0.00026 Average unit stream power (W/m2) 1.32458181818191.325 W/m² <br /> Project background Edit project background Reach length directly affected (m) 15001,500 m <br />1.5 km <br />150,000 cm <br /> Project started 2008/03/01 Works started 2011/01/01 Works completed 2011/07/01 Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Province Noord-Brabant, Water board de Dommel, Dutch Ministry of Economic Affairs, Dutch Ministry of Waterworks 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 Fish Physico-chemical Nutrient concentrations Other reasons for the project Landscape enhancement, Recreation 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 Macrophytes Yes Yes No No No Improvement Fish Yes Yes No No No No change 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 http://www.esschestroom.nl/images/files/Projectplan.pdf Essche stroom project plan (Dutch) Supplementary Information Edit Supplementary Information