Case study:Restoration of the River Korvajoki - Revision history

Kasvio at 10:59, 19 December 2013

2013-12-19T10:59:19Z

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Kasvio at 10:58, 19 December 2013

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	\|Works completed=2013/06/02		\|Works completed=2013/06/02
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			\|Hydromorphological quality elements=Channel pattern/planform, Width & depth variation,
			\|Biological quality elements=Fish, Invertebrates,
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	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}

Kasvio at 10:58, 19 December 2013

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	\|Average bankfull channel width category=2 - 5 m		\|Average bankfull channel width category=2 - 5 m
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	{{Project background}}		{{Project background
			\|Reach length directly affected=1 930
			\|Project started=2013/03/03
			\|Works started=2013/04/01
			\|Works completed=2013/06/02
			}}
	{{Motivations}}		{{Motivations}}
	{{Measures}}		{{Measures}}

Kasvio at 10:57, 19 December 2013

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			\|Heavily modified water body=No
			\|Protected species present=Yes
			\|Invasive species present=Yes
			\|Species=Brook trout, Brown trout, grayling (Thymallus thymallus),
			\|Average bankfull channel width category=2 - 5 m
			}}
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Kasvio at 10:56, 19 December 2013

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			{{Case study image
			\|File name=Korvajoki before 2011.JPG
			\|Caption=The river Korvajoki before any restoration work (year 2011).
			}}
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Kasvio at 10:55, 19 December 2013

2013-12-19T10:55:42Z

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	{{Project overview		{{Project overview
	~~\|Project title=Restoration of the River Korvajoki~~
	\|Status=Complete		\|Status=Complete
	\|Themes=Fisheries, Habitat and biodiversity, Hydromorphology		\|Themes=Fisheries, Habitat and biodiversity, Hydromorphology
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	\|Contact organisation=Centre for Economic Development, Transport and the Environment for Lapland		\|Contact organisation=Centre for Economic Development, Transport and the Environment for Lapland
	\|Multi-site=No		\|Multi-site=No
			\|Project picture=Korvajoki after 2011.JPG
			\|Picture description=THe River Korvajoki after restoration year 2013 (photo J. Huhtala)
			\|Project summary=The River Korvajoki is 2 900 meters long and it flows though forest areas from the Lake Korvajärvi to the Lake Simojärvi. The river bed is mainly sand and contains rocks and gravel. The water quality in the river is good or very good.

			The Centre for Economic Development, Transport and the Environment for Lapland restored three sections in the river. The restoration was made to improve the living conditions of the fish and other species. Rocks and gravel was placed to the river to make rapid areas more suitable for the trouts to reproduce. The aim of the retoration was to improve the living conditions of migratory fish and to make the river more nature-like and closer to its natural state. Trouts, grayling and macro invertebrates will benefit from the restoration and not only in the river but also in the nearby lakes. The rivers in the area are straightened for log floating since 1900 century. Also the natural state in the rivers are altered because of intense forestry and bog drainage.

			The restoration plan was accepted 4.3.2011 and the work started immediately. The plan was restore six rivers in the area. The area is highly appreciated among the fly fishers and its very popular recreational area.

			The restoration plan aimed to slow down the current and produce suitable nesting habitats for the trouts and shelter places for the juveniles. Also versatility to the river bed was improved by digging few wider areas. Gravel was brought and placed to the river in several places bed to ensure the nesting habitats for the migratory fish. Before the restoration many stones were taken away from from the river and places a side of the river. All the stones that were piled up next to the river were used in the restoration work. Tree junks and other wooden material was used to make the flow more versatile and give more sheltered areas for juveline fish and living habitats and food for macro inveretbrates.

			The lenght of the first restored area is 1 170 meters and the width is 2,5 in average the area in total was 3 000 m2. The second was not restored in anyhw beacuse there are several extremely vulnerable pearl mussels (Margaritifera margaritifera). The thirds section was 600 meters, width 3 meters and the area was 2 000 m2. The flow in that sections was slow so the gravel, rocks and wooden particles were placed in the channel to make the flow curve more.
	}}		}}
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Kasvio: Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=66.04713118347337, 27.309608459472656 }} {{Project overview |Project title=Restoration of the River Korvajok..."

2013-12-19T10:48:14Z

Created page with "{{Case study status |Approval status=Draft }} {{Location |Location=66.04713118347337, 27.309608459472656 }} {{Project overview |Project title=Restoration of the River Korvajok..."

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{{Case study status
|Approval status=Draft
}}
{{Location
|Location=66.04713118347337, 27.309608459472656
}}
{{Project overview
|Project title=Restoration of the River Korvajoki
|Status=Complete
|Themes=Fisheries, Habitat and biodiversity, Hydromorphology
|Country=Finland
|Main contact forename=Jarmo
|Main contact surname=Huhtala
|Main contact id=Kasvio
|Contact organisation=Centre for Economic Development, Transport and the Environment for Lapland
|Multi-site=No
}}
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{{Measures}}
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