Nomenclature

Term	Description
Atlantic Salmon (Salmo salar)	Anadromous fish species.
Anadromous	Born in freshwater, migrate to sea, then return to freshwater to spawn.
Spawning Grounds	Freshwater habitats where salmon reproduce.
Migration Window	Seasonal migration period for salmon; timing overlap with low-flow matters.
Holding Behavior	Temporary holding behavior in cooler waters during low flow.
Thermal Stress Threshold	Water temperatures >20–23 °C cause stress and disrupt migration.
Predation Risk	Greater risk of being preyed upon when delayed below dams.
Energy Depletion	Loss of vital energy due to prolonged delays and swimming effort.
Critical Low Flow (CLF)	Iffezheim fishway becomes impassable to salmon.
Hydraulic Head Difference	Vertical water level difference.
HBV Model	Conceptual hydrological model for rainfall-runoff simulation.
eWaterCycle	Hydrological modeling platform for past and future flows.
RCP (Representative Concentration Pathways)	Emission pathways used for climate scenario modeling.
Climate Scenario	Projection of future climate based on emissions and policy.