Physical Change Upstream Drawdown -reduced littoral productivity -reduced littoral spawning success -reduced tributary access -reduced water quality Impoundment -reduced dissolved oxygen -settling of suspended sediment
Downstream Reduced flow -reduced habitat quantity -altered water temperature Inadequate flushing flow -accumulation of fine sediments in gravel substrate -changes in stream morphology Increased flows -scouring of substrates -physical displacement of fish -destabilization of stream banks Rapid flow fluctuation -displacem
...[+++]ent and stranding of fish and exposure of eggs Flow diversion -disruption of fish homing to natal streams Altered temperature -altered habitat quality regime -altered benthic productivity Altered water quality -altered benthic productivity Elevated total gas -injury or death of fish due to gaspressure bubble disease The majority of B.C. Hydro projects were undertaken many years ago. 
