Case study:Amerongse Bovenpolder

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Location: 51° 59' 26.69" N, 5° 27' 46.93" E

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Project overview

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Status	In progress
Project web site
Themes	Habitat and biodiversity, Social benefits
Country	Netherlands
Main contact forename	Jaring
Main contact surname	van Rooijen
Main contact user ID	User:InfoMan
Contact organisation	Dienst Landelijk Gebied
Contact organisation web site	http://www.dienstlandelijkgebied.nl/en
Partner organisations	Rijkswaterstaat, Utrechts Landschap, Staatsbosbeheer
Parent multi-site project
This is a parent project encompassing the following projects	No

Amerongse Bovenpolder seen from its northern edge, looking south.

Project summary

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The Amerongse Bovenpolder project aims to improve biodiversity, function as a green corridor, maintain and improve landscape, and to improve conditions for recreation and cultural-historical values. The work here involved the creation of a 1 ha. swamp, 6,3 ha. of fish spawning area and a 6km long seepage gully (yet to be constructed). The polder has been previously used as a landfill, for sand excavation, and for tabacco cultivation.

Rijkswaterstaat and DLG Government Service for Land and Water Management created a 45 acre seepage swamp to improve conditions for the variety of flora and fauna in the Bovenpolder. The marsh is fed by clean groundwater (= seepage) from the Utrecht Heuvelrug (hill ridge). Seepage swamp is an ideal habitat for plants that need (iron rich) groundwater such as water gillyflower, mare's-tail and sedge species. In the coming years, an old river channel will be dug outin the Bovenpolder and semi-wild horses and cattle graze the area. These measures will make the Bovenpolder suitable habitats for amphibians, small mammals, insects and marsh birds such as night heron and black stork. Ecological connections between the Utrechtse Heuvelrug the Bovenpolder will also be restored in the future, by the constructing a wildlife crossing allowing birds and mammals to pass unhindered from areas high-up to low down by the river, and vice versa. The development of the Amerongse Bovenpolder is a collaboration of the Province of Utrecht, DLG Government Service for Land and Water Management, the Ministry of Agriculture, the municipality of Amerongen, Hoogheemraadschap (water board)The Stichtse Rijnlanden and Rijkswaterstaat.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Catchment

River basin district	Rhine
River basin	Rhine

Subcatchment

River name	Rhine
Area category	1000 - 10000 km²
Area (km2)
Maximum altitude category	1000 - 2000 m
Maximum altitude (m)
Dominant geology	Siliceous
Ecoregion	Central Plains
Dominant land cover	Grassland, Urban
Waterbody ID

Other case studies in this subcatchment: Bakenhof Dyke reconstruction, Blauwe Kamer, Room for the River, Ruppoldingen, Upper Main catchment restoration

Site

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Name	Amerongse Bovenpolder
WFD water body codes
WFD (national) typology	R7
WFD water body name
Pre-project morphology	Plane bed
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	oyster catchers, Plover (Charadrius sp.), common redshank, Black-tailed Godwit, Common Snipe
Dominant hydrology
Dominant substrate	sand
River corridor land use	Intensive agriculture (arable)
Average bankfull channel width category	more than 50 m
Average bankfull channel width (m)	170170 m <br />0.17 km <br />17,000 cm <br />
Average bankfull channel depth category	5 - 10 m
Average bankfull channel depth (m)	88 m <br />0.008 km <br />800 cm <br />
Mean discharge category	100 - 1000 m³/s
Mean annual discharge (m3/s)	500500 m³/s <br />500,000 l/s <br />
Average channel gradient category	Less than 0.001
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	14001,400 m <br />1.4 km <br />140,000 cm <br />
Project started	2001/01/01
Works started	2013/01/01
Works completed	2015/12/31
Project completed	2015/12/31
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources	Rijkswaterstaat, Dienst Landelijk Gebied

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

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Mitigation of a pressure	Aggregate/mineral extraction, Flood risk management
Hydromorphology	Continuity for organisms, Freshwater flow regime
Biology
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
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Non-structural measures
Management interventions
Social measures (incl. engagement)
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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
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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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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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Additional documents and videos

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The management plan 2011-2021 for the Amerongse Bovenpolder and the Amerongs bos

Additional links and references

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Link	Description
http://http://www.dienstlandelijkgebied.nl/xmlpages/page/dlg/actueel/nieuwsitem/nieuwsbericht/2015821	DLG webpage on background Amerongse Bovenpolder (Dutch)
http://www.rijkswaterstaat.nl/water/plannen en projecten/vaarwegen/nederrijn/amerongse bovenpolder/	Rijkswater webpage on goals, planning and background Amerongse Bovenpolder (Dutch)

Supplementary Information

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