]> 2026-04-25T03:29:32+00:00 Case study:Built Kjøsnesbekken in the river Stjørdalselva 500 en River Arne sketch.pdf River Arne sketch lenght profile.pdf Leght profile of the brook (Arne Jørgen) Leght profile 2 of the brook (Arne Jørgen) Approved Less than 0.5 m 0.01 - 0.1 2 - 5 m NVE (Norwegian Water Resources and Energy Directorate) Yes No Yes true Arne photo6 juncion creek and main river.JPG Arne photo5 largest pond.JPG Arne photo4.JPG Creek and main river (photo: Arne Jørgen) Largest pond on the brook (photo: Arne Jørgen) Added wood material (photo: arne Jørgen) No 63.4601391,11.1931992 Kasvio Arne NVE (Norwegian Water Resources and Energy Directorate) Jørgen and Kjøsnes 100 - 1000 m³/s ,, ,,, NIVA Water flow and temperature is logged every hour Benthos and fish will be monitored yearly by NIVA. The first salmon fry was observed two days after the channel was opened. One month after there were fish in the whole side channel: A. salmon, brown trout and flounder. There were three cohorts of A. salmon observed: 1+, 2+ & 3+. NIVA 11842 Kjøsnesbekken was built with gravel (photo: Arne Jørgen) Arne photo1.JPG 2012-01-01Z 2455927.5 Complete NVE constructed a complete new river side channel in an old river course next to the river Stjørdalselva in Norway. A unique collaboration between NVEs civil engineers, biologists and construction workers resulted in a 700m long and 2-5m wide miniature river containing all necessary habitats for salmonid fish. It was built to compensate for the loss of suitable habitats in the main river due to human impacts such as railroad construction, hydropower regulation, removal of gravel from river bed, road building, flood protection work etc. Detailed planning with accurate calculations of slope, size of weirs, length of ponds, suitable water velocity on spawning grounds and use of correct substrate were done to ensure the new river could host fish of all cohorts. Depth varies between 0,2 to 0,5m in the more rapid parts downstream the weirs. In the three resting ponds there are areas as deep as 1,5 m where fish can take shelter during periods of low water flows. Water flow varies between 150 – 800 l/sec depending on the flow in the main river. The inlet to the miniature river is through a 36 m long pipe with a diameter of 0,8m and the slope in the brook is 1:350m (3 ‰). The use of riparian vegetation, roots with rootwad and large woody debris contributes with food and shelter for fish and also makes the area look very natural and untouched. The miniature river is constructed in a way that ensures that there will always be a minimum of running water. Discharge and water temperature is monitored in real-time. Along with annual biological inquires this will provide useful surveillance data that can be useful in similar projects. Built Kjøsnesbekken in the river Stjørdalselva built kjøsnesbekken in the river stjørdalselva No 700 Kjøsnesbekken in the river Stjørdalselva kjøsnesbekken in the river stjørdalselva Brown trout (Salmo trutta) Atlantic salmon (Salmo salar) Fisheries Habitat and biodiversity Hydropower Hydromorphology Monitoring 100 more than 10000 k€ 124.666 2013-07-01Z 2456474.5 2013-09-06T10:41:10Z 2456541.9452546 2013-09-20T16:57:59Z 2456556.2069329 Built Kjøsnesbekken in the river Stjørdalselva