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nnhold Forord ............................................................................................................................................................ 1 Innhold........................................................................................................................................................... 3 1 Oversikt over gitte konsesjoner.............................................................................................................. 7 2 Omfang og virkeområde for de konsesjoner som skal revideres........................................................... 7 3 Oversikt over Langvatnreguleringen ...................................................................................................... 9 3.1 Introduksjon - naturforhold............................................................................................................. 9 3.2 De tekniske anlegg ...................................................................................................................... 10 3.2.1 Langvatn og overføringer ........................................................................................................10 3.2.2 Langvassåga ........................................................................................................................... 10 3.2.3 Reinforsen dam ....................................................................................................................... 11 3.2.4 Langvatn kraftverk ................................................................................................................... 12 3.2.5 Reinforsen kraftverk ................................................................................................................ 12 3.2.6 Ranelva nedstrøms samløpet med Langvassåga................................................................... 12 4 Hydrologiske forhold............................................................................................................................. 13 4.1 Vannføring i elver......................................................................................................................... 13 4.1.1 Ranelva.................................................................................................................................... 13 4.1.2 Røvassåga............................................................................................................................... 14 4.1.3 Langvassåga ........................................................................................................................... 15 4.1.4 Totalfelt Reinforsen ................................................................................................................. 16 4.1.5 Nedstrøms Reinforsen............................................................................................................. 19 4.2 Vannstander i magasiner............................................................................................................. 20 4.2.1 Historiske vannstandsvariasjoner............................................................................................ 20 4.2.2 Utveksling av vann mellom Langvatn magasinet og Reinforsen magasinet........................... 21 4.2.3 Flomtap fra magasinene..........................................................................................................22 4.3 Flommer....................................................................................................................................... 22 4.4 Lavvannføringer........................................................................................................................... 23 4.5 Vanntemperatur........................................................................................................................... 24 4.6 Isforhold ....................................................................................................................................... 24 5 Manøvreringsreglementet og manøvreringspraksis............................................................................. 24 5.1 Manøvreringsreglementet............................................................................................................ 24 5.2 Manøvreringspraksis ................................................................................................................... 24 5.3 Flomtap fra magasinene.............................................................................................................. 27 5.4 Manøvreringstiltak for å begrense miljøvirkninger....................................................................... 27 5.4.1 Langvatn kraftstasjon .............................................................................................................. 27 3 5.4.2 Langvatn.................................................................................................................................. 27 5.5 Hendelser med relevans.............................................................................................................. 27 6 Kraftproduksjonen og betydning av de ulike elementer....................................................................... 28 7 Oversikt over utredninger, skjønn og utførte avbøtende tiltak ............................................................. 28 7.1 Utførte nyere utredninger ............................................................................................................ 28 7.2 Gjennomførte skjønn ................................................................................................................... 28 7.3 Utførte avbøtende tiltak ............................................................................................................... 29 8 Erfarte skader og ulemper.................................................................................................................... 29 8.1 Fisk og fiske................................................................................................................................. 29 8.1.1 Langvatn.................................................................................................................................. 29 8.1.2 Ranelva.................................................................................................................................... 29 8.2 Friluftsliv og ferdsel...................................................................................................................... 30 8.3 Erosjon og sedimentering............................................................................................................ 30 8.4 Vannkvalitet ................................................................................................................................. 31 8.4.1 Ranelva...................................................................................................................................