]> 2026-04-11T14:00:37+00:00 Case study:River Fugla 500 en Approved Bank improvement Introduction of gravel Adding sinuosity Bank stabilisation Yes No No No Invertebrates,No,Yes,No,No,No, Invertebrates No NVE (Norwegian Water Resources and Energy Directorate) Yes No Yes true River Fugla 2.JPG River Fugla 3.JPG No 63.443813952072,10.915517807007 Kasvio Arne Jørgen NVE (Norwegian Water Resources and Energy Directorate) Kjøsnes Bank improvement, Introduction of gravel, Adding sinuosity, Bank stabilisation,,, ,,, The brook is now more suited for fish because the water quality is better. One month after the restoration work numerous sea trout individuals were observed spawning in the River Fugla. 12167 Rocks, gravel and roots were placed to the brook (photo Arne Jørgen Kjøsnes) 2013-10-31Z 2456596.5 River Fugla.JPG 2013-05-05Z 2456417.5 Complete The river Fugla is a small river in Hell in Stjoerdal community in the middle part of Norway. River is situated next to the river Stjørdalselva. This is in an area susceptible to slides and the river has been cutting increasingly deeper into the potential unstable sediments. Quick clay is a type of marine clay prone to sudden loss of strength when disturbed. After failure the clay may become liquid, and this could lead to big landslides. Primarily found in the upper region of the Northern Hemisphere. Quick clay slides occur without warning and may wipe out large areas often causing loss of life and substantial material damage. Landslides can be triggered by high rivers that erode and saturate clay slopes, by melt water and rain that destabilize a deposit or by human activity such as fillings, excavations etc.. In populated areas with high risk of landslide hazard, improvements as raising the river bottom is used to stop erosion. In many rivers and brooks large stretches of the river bed might be raised by several meters and both the river bed and banks will be plastered with erosion-proof rocks. NVE secured this river for further erosion and the work was conducted with the use of erosion-proof rocks both in the river bed and banks for a total distance of about 600 meters. Prior to the mitigating work the water quality was poor and the river was often colored grey due to erosion. Also logs, roots etc were placed in the brook and spawning gravel in to the rapid areas. The construction work protects the area from the slides. At the same time it can ruin habitats for anadromous fish and aquatic invertebrates. To restore the river and recreate suitable habitats for sea trout and salmon, some simple mitigating measures were done. Building small weirs to create deeper ponds, adding spawning gravel, roots with rootwad, and the use of logs and large woody debris, made the river more suitable for aquatic organisms. Mitigating measures were set up over a distance of about 250 meters of the river. With the measures done the river now lookes more natural. River Fugla river fugla No Brown trout (Salmo trutta) Atlantic salmon (Salmo salar) Habitat and biodiversity Monitoring 160 124-44-R 2013-12-17T08:30:44Z 2456643.8546759 2017-06-01T12:20:08Z 2457906.0139815 River Fugla