Case study:Restoration of the river Børselva - Revision history

Alexrrc at 09:12, 25 February 2020

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	{{Case study status		{{Case study status
	\|Approval status=~~Draft~~		\|Approval status=Approved
	}}		}}
	{{Location		{{Location

NIVA DK at 06:51, 24 February 2020

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	{{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

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NIVA DK at 06:46, 24 February 2020

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	{{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
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	{{Other responses header}}		{{Other responses header}}

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 |Monitored after=Yes
 |Qualitative monitoring=No
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 |Control site used=No
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NIVA DK at 06:35, 24 February 2020

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	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

NIVA DK at 06:15, 24 February 2020

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	\|Multi-site=No		\|Multi-site=No
	\|Project picture=Borselva.jpg		\|Project picture=Borselva.jpg
	\|Picture description=~~Opened stretch of the stream, with~~ macrophyte removal, ~~and~~ sedimentation ~~ponds~~ (left ~~hand side~~) ~~to reduce agricultural inputs~~.		\|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.

NIVA DK at 06:13, 24 February 2020

2020-02-24T06:13:56Z

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	\|Multi-site=No		\|Multi-site=No
	\|Project picture=Borselva.jpg		\|Project picture=Borselva.jpg
			\|Picture description=Opened stretch of the stream, with macrophyte removal, and sedimentation ponds (left hand side) to reduce agricultural inputs.
	\|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.

NIVA DK at 06:11, 24 February 2020

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	{{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

NIVA DK at 06:09, 24 February 2020

2020-02-24T06:09:08Z

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	\|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}}
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