Case study:Amerongse Bovenpolder

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Location: 51° 59' 27", 5° 27' 47"
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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 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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Catchment and subcatchment

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

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) 170
170 m
0.17 km
17,000 cm
Average bankfull channel depth category 5 - 10 m
Average bankfull channel depth (m) 8
8 m
0.008 km
800 cm
Mean discharge category 100 - 1000 m³/s
Mean annual discharge (m3/s) 500
500 m³/s
500,000 l/s
Average channel gradient category Less than 0.001
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 1400
1,400 m
1.4 km
140,000 cm
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

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

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

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://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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