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.

Monitoring surveys and results

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Catchment and subcatchment

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Site

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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

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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
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Reasons for river restoration

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Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
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Measures

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Structural measures
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Planform / Channel pattern
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Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Biological quality elements

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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

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quality elements

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Any other monitoring, e.g. social, economic

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	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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Additional links and references

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Supplementary Information

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