Case study:Klassiek beekherstel Astense Aa

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Location: 51° 25' 16.61" N, 5° 46' 23.66" E

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Project overview

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Status	Complete
Project web site
Themes	Environmental flows and water resources, Habitat and biodiversity, Hydromorphology, Water quality
Country	Netherlands
Main contact forename	Waterschap
Main contact surname	Aa en Maas
Main contact user ID
Contact organisation	Waterschap Aa en Maas
Contact organisation web site	http://www.aaenmaas.nl/
Partner organisations	STOWA
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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De Astense Aa was een rechte beek met steile oevers. Door deze eigenschappen wordt water snel afgevoerd. Dit zorgt voor wateroverlast bij extreme neerslag en voor droogte in periodes waarin het weinig regent. Dit is geen ideale situatie. Daarnaast was de situatie ook niet zo aantrekkelijk voor planten en dieren. Daarom richt het waterschap Aa en Maas de Astense Aa in fases opnieuw in.

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Astense Aa tijdens de herinrichting

Astense Aa na de herinrichting

Astense Aa 1 jaar na herinrichting

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Astense Aa River basin Maas Subcatchment River name Area category 10 - 100 km² Area (km2) 5757 km² <br />5,700 ha <br /> Maximum altitude category Less than 100 m Maximum altitude (m) 2020 m <br />0.02 km <br />2,000 cm <br /> Dominant geology Siliceous Ecoregion Dominant land cover Intensive agriculture (arable) Waterbody ID Site Edit site Name Astense Aa WFD water body codes NL38-4K WFD (national) typology R4 WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No 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 Intensive agriculture (arable) Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) 66 m <br />0.006 km <br />600 cm <br /> Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) 0.690.69 m <br />6.9e-4 km <br />69 cm <br /> Mean discharge category 0.1 - 1.0 m³/s Mean annual discharge (m3/s) 0.250.25 m³/s <br />250 l/s <br /> Average channel gradient category Less than 0.001 Average channel gradient 0.000375 Average unit stream power (W/m2) 0.1532343750.153 W/m² <br /> Project background Edit project background Reach length directly affected (m) 34003,400 m <br />3.4 km <br />340,000 cm <br /> Project started 2011 Works started 2012/01/01 Works completed 2013/12/31 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 Waterschap Aa en Maas 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 Traditioneel beekherstel 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