]> 2026-04-18T06:43:23+00:00 Case study:Restoration of the River Korvajoki 500 en Approved 2 - 5 m Centre for Economic Development, Transport and the Environment for Lapland No No Yes false Korvajoki before 2011.JPG The river Korvajoki before any restoration work (year 2011). Yes 66.047131183473,27.309608459473 Kasvio Jarmo Centre for Economic Development, Transport and the Environment for Lapland Huhtala ,, ,,, 12213 THe River Korvajoki after restoration year 2013 (photo J. Huhtala) Korvajoki after 2011.JPG 2013-03-03Z 2456354.5 Complete 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. Restoration of the River Korvajoki restoration of the river korvajoki Yes 1930 Brook trout Brown trout grayling (Thymallus thymallus) Fisheries Habitat and biodiversity Hydromorphology 2013-06-02Z 2456445.5 2013-04-01Z 2456383.5 2013-12-19T10:48:14Z 2456645.950162 2013-12-19T10:59:19Z 2456645.9578588 Restoration of the River Korvajoki