Case study:Kleine Aa, traject Smalwater Noord

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Location: 51° 35' 42", 5° 16' 36"
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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 Michele
Main contact surname Berg
Main contact user ID
Contact organisation Dienst Landelijk Gebied
Contact organisation web site http://www.dommel.nl/algemene onderdelen/english
Partner organisations Waterboard De Dommel, Stichting Brabants Landschap
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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Lessons learnt

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Catchment and subcatchment



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) 7.7
7.7 m
0.0077 km
770 cm
Average bankfull channel depth category 0.5 - 2 m
Average bankfull channel depth (m) 1.5
1.5 m
0.0015 km
150 cm
Mean discharge category 1 - 10 m³/s
Mean annual discharge (m3/s) 4
4 m³/s
4,000 l/s
Average channel gradient category Less than 0.001
Average channel gradient 0.00026
Average unit stream power (W/m2) 1.3245818181819
1.325 W/m²


Project background

Reach length directly affected (m) 1500
1,500 m
1.5 km
150,000 cm
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

Mitigation of a pressure
Hydromorphology
Biology Fish
Physico-chemical Nutrient concentrations
Other reasons for the project Landscape enhancement, Recreation


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

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

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

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

Any other monitoring, e.g. social, economic

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


Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://www.esschestroom.nl/images/files/Projectplan.pdf Essche stroom project plan (Dutch)

Supplementary Information

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