]> 2026-04-18T03:39:15+00:00 Case study:Reopening of Mjølløst stream 500 en Project deculverting Mjollost stream.pdf GJEaaPNING AV MJoLoSTBEKKEN - kommentarer NLR.pdf Description of the culverted stream, and initial technical proposal for deculverting (in Norwegian) Kommentarer fra NLR Draft Reopening of culverted river No Yes No No Fish: Abundance,Yes,No,No,Yes,No, Fish: Abundance Yes Vannområde Horten-Larvik Sandefjord kommune Sandefjord Forvaltningsråd for Anadrom Laksefisk The Norwegian Environmental Agency (Miljødirektoratet) Yes No Yes false Mjollost 1 (downtreams) october 2020.jpg Mjollost 2 (upstreams) october 2020.jpg Mjollost 3 (upstreams) october 2020.jpg Yes 20 1. Because of its proximity to the railway (< 30 m) it is required an approval from the railway authorities (Bane-Nor) in order to be able to daylight / deculvert the stream. 2. There can be quick clay (kvikkleire) in the area of restoration according to NVE (Norwegian Water Resources and Energy Directorate). This makes necessary to explore the ground stability before digging the pipe out of the ground. This will increase considerably the costs of the project. Unnebergsbekken Frombekken Mjølløstbekken 59.159716249856,10.260887850104 Miguel A. Vannområde Horten-Larvik Segarra Valls 0.03 Reopening of culverted river,,, ,,Planting riparian vegetation with school pupils., 5 Results electrofishing October 2020 (before reopening of the stream): Station 1 (downstreams closure): 141 trout / 100 m2. Station 2 (upstreams closure): 1 trout / 100m2. Station 3 (200 m ustreams closuse): 57 trout / 100m2. Fish from upstream stations (2 and 3) is stationary trout introduced by local people from other locations. 26141 Sandefjord kommune, Sandefjord Forvaltningsråd for Anadrom Laksefisk 5 Mjollostbekken 1959-79 (venstre) 2017 (hoyre).jpg 2020-03-01Z 2458909.5 Planned Mjølløst stream is part of a 17 km long stream system. Mjølløst stream has since the 1960s had a 270 meter long stream closure that prevents sea trout from accessing a 1.4 km stream stretch. The concrete pipe is getting closer to the end of its lifetime and might collapse in the next years if nothing is done. Landowner, local and regional authorities are positive to remove the culvert and restore the original stream. This project got funding from Norwegian Environment Agency (Miljødirektoratet) in 2020 and we intend to implement it in 2021, if it is technically possible (see "Lessons learnt"). Reopening of Mjølløst stream reopening of mjølløst stream No 270 Planting riparian vegetation with school pupils. Sea trout (Salmo trutta) European eel (Anguilla anguilla) Preliminary estimates. Habitat and biodiversity Land use management - agriculture Monitoring 100 REL2321 NO014-113-R Unnebergsbekken bekkefelt 70 2020-10-31T15:53:54Z 2459154.1624306 2021-02-16T10:39:50Z 2459261.9443287 Reopening of Mjølløst stream