ABSTRACT
ABSTRACT: This paper present ecological remediation measures at Schiffenen dam in Switzerland, for hydropeaking with a peak flow of 135 m3/s during turbine operation and a residual flow of 5 m3/s. The remediation aims to reduce short-term artificial changes in the water flow, to reduce velocity of water level changes in the river and to improve the ecological aspects of the downstream section. For the fish migration, the proposed and discussed solutions are: migration canal, bypass stream, fish lift and fish pass. These solutions are discussed based on hydraulic, economic, environmental and restoration considerations. Rehabilitation processes such as bed enlargement, gravel bank establishment or wildlife protection are proposed jointly to the constructive solutions.
