The hydrological investigations in the Atna basin started in 1917 with discharge measurements at the outlet of Lake Atnsjøen. Ice data are available from the lake since 1950 and water temperature data from 1980. With the start of the FORSKREF program in 1986 the number of hydrological stations increased substantially and included also snow measurements. During the FORSKREF period 1986–98 the annual...
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