Case study:Restorations of River Nolån-Hulta dam removal

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Location: 57° 42' 16.62" N, 12° 34' 42.75" E

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Hydropower
Country	Sweden
Main contact forename	Andreas
Main contact surname	Bäckstrand
Main contact user ID
Contact organisation	Länsstyrelsen västra Götalands län
Contact organisation web site	http://projektwebbar.lansstyrelsen.se/rolfsan/Sv/folj-atgardsarbetet/Pages/nolan.aspx
Partner organisations
Parent multi-site project	Case_study:Biologisk återställning i Rolfsåns vattensystem
This is a parent project encompassing the following projects	No

Removed dam (photo.Maria Arola)

Project summary

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Hulta Dam is situated in South-East of Sweden in River Nolån. Hulta dam was built in the late 1800´s as a sawmill and flour mill. Even though the mill burned down in 1990´s the dam made it impossible for fish to migrate upstreams. In may 2010 the municipality of Bollebygd bought the dam and surrounding land as the aim of restoring it for migrating fish and other aquatic organisms. Court gave permission for restorations in april 2012. Restorations took place in summer 2012 when dam was removed and fishpassage constructed. The project was carried out co-operation with the consultant SWECO Environment AB, municipality of Bollebygd and the County Administrative Board of Västra Götalands and financed with state funds.

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Catchment and subcatchment

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Catchment

River basin district	Skagerrak and Kattegat River basin
River basin	Rolfsån River Basin

Subcatchment

River name	River Rolfsån
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m)
Dominant geology	Organic (i.e. Peat)
Ecoregion	Fenno-Scandian Shield
Dominant land cover	Woodland, Intensive agriculture (arable)
Waterbody ID

Other case studies in this subcatchment: Apelnäs fishway at River Rolfså, Biologisk återställning i Rolfsåns vattensystem, Bosgården nature-like fishway at River Rolfså, Dam removal at Grönkullen, River Rolfsån, ´Restorations of River Nolån-Bypass channel in Hulta Hydro power plant, ´Restorations of River Nolån-Fishway in Forsa hydro power plant, Ålgårda nature-like bypass channel at River Rolfsån

Site

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Name	Hulta Dam
WFD water body codes
WFD (national) typology
WFD water body name	River Nolån
Pre-project morphology	Embanked, Artificial bed, Artificial 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
River corridor land use	Intensive agriculture (arable)
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)
Project started
Works started	2012/06/01
Works completed	2012/07/18
Project completed
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Total cost (k€)
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Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design
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Works and works supervision
Post-project management and maintenance
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Reasons for river restoration

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Mitigation of a pressure
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Biology
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Measures

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Structural measures
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Floodplain / River corridor
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Non-structural measures
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Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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quality elements

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Monitoring documents

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Image gallery

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Upstreams from the dam (photo. Maria Arola)

Additional documents and videos

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Additional links and references

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Supplementary Information

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