Abstract
Summary Today, the worldwide yearly mean loss of storagecapacity due to sedimentation is already higher thanthe increase of capacity by the construction of new res-ervoirs for irrigation, drinking water, and hydropower.Thus, the sustainable use of the reservoirs is notguaranteedinlongterm.Inthecaseofalpinereservoirs,the sedimentation rate is much below the world meanvalue. Nevertheless, sedimentation threatens also thesereservoirs since turbidity currents are sporadicallytransporting large volumes of sediments like an under-water avalanche down to the dam. There, the concen-trated deposits are hindering the safe operation of theoutlet structures as intakes and bottom outlets. Manypossible measures against sedimentation are knownfrom practice, but they are strongly depending on thelocalconditions.Forreservoirsinrathernarrowvalleys,technical measures, which can govern turbidity cur-rents, are of special interest. The problematic of sedi-mentation and sediment management should beconsidered in the early stage of the design of thereservoir in order to obtain sustainable solutions.Although methods for erosion volume estimation andempirical relationships for trap efficiency estimationareavailable,thisisstillnotthecaseformanyreservoirsbuilt recently all over the world.
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