Case study:Restoration of the river Børselva: Difference between revisions

From RESTORE
Jump to navigation Jump to search
No edit summary
No edit summary
 
(9 intermediate revisions by one other user not shown)
Line 1: Line 1:
{{Case study status
{{Case study status
|Approval status=Draft
|Approval status=Approved
}}
}}
{{Location
{{Location
Line 7: Line 7:
{{Project overview
{{Project overview
|Status=In progress
|Status=In progress
|Themes=Habitat and biodiversity, Hydropower, Hydromorphology, Land use management - agriculture
|Project web site url=www.borselva.no/bakgrunn/bakgrunn.php
|Themes=Fisheries, Habitat and biodiversity, Hydropower, Hydromorphology, Land use management - agriculture, Monitoring
|Country=Norway
|Country=Norway
|Main contact forename=Lars
|Main contact forename=Lars
Line 16: Line 17:
|Multi-site=No
|Multi-site=No
|Project picture=Borselva.jpg
|Project picture=Borselva.jpg
|Picture description=A newly opened (macrophyte removal) section of Børselva, including sedimentation pond (far left) and consecutive constructed wetlands. Source: Aanes et al 2016 (NIVA report 6900-2015)
|Project summary=In 1999, before the measures were carried out, there were problems with siltation and overgrowth of macrophytes in the river channel, due to the greatly reduced water flow resulting from hydropower production and agricultural drainage. There were very poor conditions for fish and other aquatic organisms. Nearly 70% of the water area in Børselva was covered by plants. Important habitats for wetland birds were in danger of disappearing. Large areas of trout spawning and growing areas were destroyed.
|Project summary=In 1999, before the measures were carried out, there were problems with siltation and overgrowth of macrophytes in the river channel, due to the greatly reduced water flow resulting from hydropower production and agricultural drainage. There were very poor conditions for fish and other aquatic organisms. Nearly 70% of the water area in Børselva was covered by plants. Important habitats for wetland birds were in danger of disappearing. Large areas of trout spawning and growing areas were destroyed.


Measures implemented in the agricultural channel ("Bruksåskanalen") included erosion control, establishment of sedimentation ponds with vegetation filters and revegetation along the channel. Three paved thresholds were established in Børselva, with the laying of spawning gravel. 1 km of the overgrown part of the river was opened with an excavator and fiber fabric was laid, with stone and gravel on top. Dredging and opening of the rest of the Børselva with a large excavator ("Langemann") was carried out. Different water discharges in Børselva (from the dam in Børsvatnet) were tested - with the main focus on “flushing floods” and winter water flow.
Measures implemented in the agricultural channel ("Bruksåskanalen") included erosion control, establishment of sedimentation ponds with vegetation filters and revegetation along the channel. Three paved thresholds were established in Børselva, with the laying of spawning gravel. 1 km of the overgrown part of the river was opened with an excavator and fiber fabric was laid, with stone and gravel on top. Dredging and opening of the rest of the Børselva with a large excavator ("Langemann") was carried out. Different water discharges in Børselva (from the dam in Børsvatnet) were tested - with the main focus on “flushing floods” and winter water flow.
|Monitoring surveys and results=The condition in 2019 after the rehabilitation work showed major environmental improvements, but the environmental objectives of good chemical status and good ecological potential have not yet been reached. Further measures are required to reduce agricultural runoff and to implement the final regime for environmentally based water discharges. As of 2019, the hydroelectric license is under review at NVE (The Norwegian Water Resources and Energy Directorate).


The condition in 2019 after the rehabilitation work showed major environmental improvements, but the environmental objectives of good chemical status and good ecological potential have not yet been reached. Further measures are required to reduce agricultural runoff and to implement the final regime for environmentally based water discharges. As of 2019, the hydroelectric license is under review at NVE (The Norwegian Water Resources and Energy Directorate).
Litterature e.g.:
|Monitoring surveys and results=www.fylkesmannen.no/contentassets/74f02cdd90cb485ea8def16785a345d3/ballangen---borselva---2016---etterundersokelser-etter-restaureringstiltak---vannvegetasjon-og-fisk---niva-rapp-7083-2016.pdf
www.fylkesmannen.no/contentassets/74f02cdd90cb485ea8def16785a345d3/ballangen---borselva---2016---etterundersokelser-etter-restaureringstiltak---vannvegetasjon-og-fisk---niva-rapp-7083-2016.pdf
|Lessons learn=The measures in the Børselva watercourse (Børselvvassdraget) have created better water quality and hydrological continuity (open water flow) in the formerly overgrown watercourse. The flow levels have improved, self-cleaning has improved and pollution has been reduced. This has resulted in a more varied benthic fauna, better spawning and growing conditions for the trout and improved conditions for the bird fauna.
|Lessons learn=The measures in the Børselva watercourse (Børselvvassdraget) have created better water quality and hydrological continuity (open water flow) in the formerly overgrown watercourse. The flow levels have improved, self-cleaning has improved and pollution has been reduced. This has resulted in a more varied benthic fauna, better spawning and growing conditions for the trout and improved conditions for the bird fauna.
|Project title=Restoration of the river Børselva
|Project title=Restoration of the river Børselva
Line 52: Line 55:
{{Motivations
{{Motivations
|Specific mitigation=Hydropower, Land drainage,
|Specific mitigation=Hydropower, Land drainage,
|Hydromorphological quality elements=Quantity & dynamics of flow,
|Biological quality elements=Fish, Macrophytes, Invertebrates, Water birds
|Physico-chemical quality elements=Nutrient concentrations, Oxygen balance,
}}
}}
{{Measures
{{Measures
Line 59: Line 65:
}}
}}
{{Hydromorphological quality elements header}}
{{Hydromorphological quality elements header}}
{{Hydromorphological quality element table row
|Element=Continuity for organisms
|Monitored before=Yes
|Monitored after=Yes
|Qualitative monitoring=Yes
|Quantitative monitoring=No
|Control site used=No
|Result=Improvement
}}
{{Hydromorphological quality element table row
|Element=Substrate conditions
|Monitored before=Yes
|Monitored after=Yes
|Qualitative monitoring=Yes
|Quantitative monitoring=No
|Control site used=No
|Result=Inconclusive
}}
{{Hydromorphological quality element table row
|Element=Quantity & dynamics of flow
|Monitored before=Yes
|Monitored after=Yes
|Qualitative monitoring=No
|Quantitative monitoring=Yes
|Control site used=No
|Result=Inconclusive
}}
{{End table}}
{{End table}}
{{Biological quality elements header}}
{{Biological quality elements header}}
Line 66: Line 99:
|Monitored after=Yes
|Monitored after=Yes
|Qualitative monitoring=No
|Qualitative monitoring=No
|Quantitative monitoring=No
|Quantitative monitoring=Yes
|Control site used=No
|Result=Improvement
}}
{{Biological quality element table row
|Element=Invertebrates
|Monitored before=Yes
|Monitored after=Yes
|Qualitative monitoring=No
|Quantitative monitoring=Yes
|Control site used=No
|Result=Improvement
}}
{{Biological quality element table row
|Element=Macrophytes
|Monitored before=Yes
|Monitored after=Yes
|Qualitative monitoring=No
|Quantitative monitoring=Yes
|Control site used=No
|Control site used=No
|Result=No change
}}
}}
{{End table}}
{{End table}}
{{Physico-chemical quality elements header}}
{{Physico-chemical quality elements header}}
{{Physico-chemical quality element table row
|Element=Nutrient concentrations
|Monitored before=Yes
|Monitored after=Yes
|Qualitative monitoring=No
|Quantitative monitoring=Yes
|Control site used=No
|Result=Improvement
}}
{{End table}}
{{End table}}
{{Other responses header}}
{{Other responses header}}
Line 102: Line 163:
|Link=https://niva.brage.unit.no/niva-xmlui/handle/11250/2478671
|Link=https://niva.brage.unit.no/niva-xmlui/handle/11250/2478671
|Description=NIVA reåprt 7148-2017 (2017): "Etterundersøkelser av makrovegetasjon og vannkjemi i Børselva 2016"
|Description=NIVA reåprt 7148-2017 (2017): "Etterundersøkelser av makrovegetasjon og vannkjemi i Børselva 2016"
}}
{{Additional links and references
|Link=https://niva.brage.unit.no/niva-xmlui/bitstream/handle/11250/2415217/5967-2010.pdf?sequence=1&isAllowed=y
|Description=NIVA report 5967-2010 (2010): Fiskeundersøkelser i Børselvvassdraget, Ballangen kommune, 2009"
}}
}}
{{Additional links and references footer}}
{{Additional links and references footer}}
{{Supplementary Information}}
{{Supplementary Information}}
{{Toggle content end}}
{{Toggle content end}}

Latest revision as of 09:12, 25 February 2020

0.00
(0 votes)


To discuss or comment on this case study, please use the discussion page.


Location: 68° 18' 13.95" N, 16° 42' 48.11" E
Loading map...
Left click to look around in the map, and use the wheel of your mouse to zoom in and out.


Project overview

Edit project overview
Status In progress
Project web site http://www.borselva.no/bakgrunn/bakgrunn.php
Themes Fisheries, Habitat and biodiversity, Hydropower, Hydromorphology, Land use management - agriculture, Monitoring
Country Norway
Main contact forename Lars
Main contact surname Sæter
Main contact user ID
Contact organisation County Governor of Nordland
Contact organisation web site http://www.fylkesmannen.no/nordland
Partner organisations The Norwegian Water Resources and Energy Directorate (NVE), Ballangen Energi AS, Norwegian Institute for Water Research (NIVA)
Parent multi-site project
This is a parent project
encompassing the following
projects 		No
A newly opened (macrophyte removal) section of Børselva, including sedimentation pond (far left) and consecutive constructed wetlands. Source: Aanes et al 2016 (NIVA report 6900-2015)

Project summary

Edit project overview to modify the project summary.


In 1999, before the measures were carried out, there were problems with siltation and overgrowth of macrophytes in the river channel, due to the greatly reduced water flow resulting from hydropower production and agricultural drainage. There were very poor conditions for fish and other aquatic organisms. Nearly 70% of the water area in Børselva was covered by plants. Important habitats for wetland birds were in danger of disappearing. Large areas of trout spawning and growing areas were destroyed.

Measures implemented in the agricultural channel ("Bruksåskanalen") included erosion control, establishment of sedimentation ponds with vegetation filters and revegetation along the channel. Three paved thresholds were established in Børselva, with the laying of spawning gravel. 1 km of the overgrown part of the river was opened with an excavator and fiber fabric was laid, with stone and gravel on top. Dredging and opening of the rest of the Børselva with a large excavator ("Langemann") was carried out. Different water discharges in Børselva (from the dam in Børsvatnet) were tested - with the main focus on “flushing floods” and winter water flow.

Monitoring surveys and results

Edit project overview to modify the Monitoring survey and results.


The condition in 2019 after the rehabilitation work showed major environmental improvements, but the environmental objectives of good chemical status and good ecological potential have not yet been reached. Further measures are required to reduce agricultural runoff and to implement the final regime for environmentally based water discharges. As of 2019, the hydroelectric license is under review at NVE (The Norwegian Water Resources and Energy Directorate).

Litterature e.g.: www.fylkesmannen.no/contentassets/74f02cdd90cb485ea8def16785a345d3/ballangen---borselva---2016---etterundersokelser-etter-restaureringstiltak---vannvegetasjon-og-fisk---niva-rapp-7083-2016.pdf

Lessons learnt

Edit project overview to modify the lessons learnt.


The measures in the Børselva watercourse (Børselvvassdraget) have created better water quality and hydrological continuity (open water flow) in the formerly overgrown watercourse. The flow levels have improved, self-cleaning has improved and pollution has been reduced. This has resulted in a more varied benthic fauna, better spawning and growing conditions for the trout and improved conditions for the bird fauna.


Image gallery


ShowHideAdditionalImage.png


Catchment and subcatchment



Site

Name Børselva
WFD water body codes 172-5-R (EU-ID:NO172-5-R)
WFD (national) typology RNM2321
WFD water body name Børselva
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation Norway - Naturreservat
Local/regional site designations National Reserve
Protected species present Yes
Invasive species present No
Species of interest
Dominant hydrology Artificially regulated
Dominant substrate
River corridor land use Broadleaf/mixed woodland (semi natural), Improved/semi-improved grassland/pasture, Wetland, Tall herb/rank vegetation
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) 0.150.15 m³/s <br />150 l/s <br />
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started 1997/01/01
Works started
Works completed
Project completed
Total cost category 100 - 500 k€
Total cost (k€) 296296 k€ <br />296,000 € <br />
Benefit to cost ratio
Funding sources Ballangen Energi AS, The Norwegian Water Resources and Energy Directorate (NVE)

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 Hydropower, Land drainage
Hydromorphology Quantity & dynamics of flow
Biology Fish, Macrophytes, Invertebrates, Water birds
Physico-chemical Nutrient concentrations, Oxygen balance
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Cut back of plants, Introduction of spawning gravels, Creation of mini-treshold, Creation of pools, sediment, Sediment trap building
Floodplain / River corridor Erosion protection
Planform / Channel pattern
Other
Non-structural measures
Management interventions Reduced pollution, Flow management
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
Continuity for organisms Yes Yes Yes No No Improvement
Substrate conditions Yes Yes Yes No No Inconclusive
Quantity & dynamics of flow Yes Yes No Yes No Inconclusive

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Fish Yes Yes No Yes No Improvement
Invertebrates Yes Yes No Yes No Improvement
Macrophytes Yes Yes No Yes No No change

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Nutrient concentrations Yes Yes No Yes No Improvement

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://www.fylkesmannen.no/contentassets/74f02cdd90cb485ea8def16785a345d3/ballangen---borselva---2016---etterundersokelser-etter-restaureringstiltak---vannvegetasjon-og-fisk---niva-rapp-7083-2016.pdf NIVA report 6900-2015 (2015): "Børselvvassdraget, Ballangen kommune 2014-2015"
http://faktaark.naturbase.no/?id=VV00000213 Website in Norwegian
http://felles.naturbase.no/api/dokument/hent/18653.PDF Pamphlet in Norwegian
http://https://niva.brage.unit.no/niva-xmlui/bitstream/handle/11250/211783/4560 72dpi.pdf?sequence=1&isAllowed=y NIVA report 4560-2002 (2002): "Børselvprosjektet rapport nr 8. Sluttrapport for del-prosjekt: Minstevannføring og begroingsproblematikk i Børselv-vassdraget"
http://https://www.fylkesmannen.no/contentassets/74f02cdd90cb485ea8def16785a345d3/ballangen---borselva---2016---etterundersokelser-etter-restaureringstiltak---bunnfauna---oksygeninnhold---vannforing--niva-rapp-7083-2016.pdf NIVA report 7083-2016 (2016): "Børselv-vassdraget, Ballangen kommune: Undersøkelser av bunnfauna, oksygenforhod vinterstid samt vannføring og vannstandsvariasjoner etter restaureringstiltak"
http://https://niva.brage.unit.no/niva-xmlui/handle/11250/2478671 NIVA reåprt 7148-2017 (2017): "Etterundersøkelser av makrovegetasjon og vannkjemi i Børselva 2016"
http://https://niva.brage.unit.no/niva-xmlui/bitstream/handle/11250/2415217/5967-2010.pdf?sequence=1&isAllowed=y NIVA report 5967-2010 (2010): Fiskeundersøkelser i Børselvvassdraget, Ballangen kommune, 2009"

Supplementary Information

Edit Supplementary Information


Retrieved from "https://restorerivers.eu/wiki/index.php?title=Case_study:Restoration_of_the_river_Børselva&oldid=46584"