Case study:´Restorations of River Nolån-Bypass channel in Hulta Hydro power plant

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Location: 57° 42' 17", 12° 34' 43"
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Project overview

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Status Planned
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

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Project summary

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A small Hulta hydro power plant is situated 400 meters upstreams from the Hulta dam. Along with other restorations in Nolåns river bypass is about to be constructed in Hulta power plant to make it possible for migrating fish and other aquatic organisms to get pass the plant. The capacity of the hydro power plant is only 1 m3/s and represents only a small portion of the medium water flow in the river which means that a large part of the water can be used in the fishway. Fishpassage is about to be built in the eastern part of the dam and a minimum flow of 300l/s will always be released in the stream. During the most extensive migrating period of salmon and brown trout (Sep-Oct)at leasat 600l/s is about to be released in the fishway. Restorations will be conducted during 2013.

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Catchment and subcatchment

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-Hulta dam removal, ´Restorations of River Nolån-Fishway in Forsa hydro power plant, Ålgårda nature-like bypass channel at River Rolfsån


Site

Name Hulta hydro power plant
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 Artificially regulated
Dominant substrate
River corridor land use Intensive agriculture (arable)
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Project background

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Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
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Reasons for river restoration

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
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Monitoring

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Supplementary Information

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