Case study:Odder Stream Restoration

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Location: 55° 55' 58.33" N, 9° 18' 34.86" E

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Project overview

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Status	Complete
Project web site	http://www.vejle.dk/Borger/Natur-og-miljoe/Naturprojekter/Odderbaek--projekter-i-hele-oplandet.aspx
Themes	Habitat and biodiversity, Land use management - agriculture
Country	Denmark
Main contact forename	Bo
Main contact surname	Levesen
Main contact user ID
Contact organisation	Vejle Kommune
Contact organisation web site	http://www.vejle.dk/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

The Odder before (right) and after (left) restoration

Project summary

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This project aimed to:

(1) Remove 480 kg P per year – equals ¾ of the total Phosphorus loading to Kul Lake; (2) Remove 18 tons N per year or 114 kg/N/ha per year; (3) Stoppage of vegetation cutting and dredging; (4) Removal of all dams/weirs in the entire watershed; (5) Ensure habitat for the orchid Coralroot (Corallorhiza trifida) and Western marsh orchid (Dactylorhiza majalis; (6) Improve habitat for the European brook lamprey (Lampetra planeri) and Eurasian otter (Lutra lutra; and (7) Open the area to the public for recreation – 37 km of trials.

The restoration activities in the first 65 hectares included:

(1) Restoring 1.3 km of stream; (2) Raised the stream bed 50 – 80 cm; (3) Crushed/removed 25 drain systems and 7 ditches; (4) Spawning grounds every 20 meters in the stream – 650 m3 gravel; (5) 15.2 hectares of permanent/semi-permanent wetlands; (6) 8.5 hectares of seasonally flooded wetlands; (7) 6 hectares of seepage wetlands from removing drains; and (8) Area is fenced to allow grazing over entire area – special agreements between land owners.

The River Restoration Centre would like to thank Matthew William Cochran, from ORBICON, for providing the information and photographs for this case study.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Site

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Name
WFD water body codes
WFD (national) typology
WFD water body name	Odder Stream
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
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m³/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m²)

Project background

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Reach length directly affected (m)	65 hectares"hectares" is not declared as a valid unit of measurement for this property.
Project started
Works started
Works completed
Project completed
Total cost category
Total cost (k€)	2,975.814632,975.815 k€ <br />2,975,814.63 € <br />
Benefit to cost ratio
Funding sources	Danish Ministry of Food, Agriculture and Fisheries; Vejle Kommune

Cost for project phases

Supplementary funding information

Costs 10,840,000 Danish Kroners ( ,971,000 million) support from the Danish Ministry of Food, Agriculture and Fisheries 250,000 DKK (,500) support from Vejle Kommune 11,090,000 DKK (,016,000)

Archaeology survey – 23,000 DKK (,000) Construction costs – 1,925,000 DKK (0,000) Administrative costs – 26,000 DKK (,000) Compensation to landowners – 7,875,000 DKK ( ,430,000) Maintenance of wetland area (grazing) – 985,000 DKK (0,000) Design and consulting services – 250,000 DKK (,500)

Reasons for river restoration

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Mitigation of a pressure	Barriers to fish migration, Phosphate
Hydromorphology
Biology
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications	Re-introducing of stones and spawning gravel, Bed raising
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions	Removed 25 drain systems and 7 ditches
Social measures (incl. engagement)
Other