Risk Assessment for Fish Passage Through Small, Low-Head Turbines
This paper discusses and provides information about Low-Head Turbines. Small, low-head run-of river hydroelectric sites are often perceived as potentially damaging to fisheries interests, especially on migratory salmonid rivers. One of the main risks occurs during the downstream migration phase of salmonid smolts (mainly spring) and parr (mainly autumnal), as often a large proportion of the total river flow may be diverted through the turbine(s). Provision of fine-meshed smolt screens across the turbine inlets helps to reduce this risk, provided that the smolts are successfully directed back to the river.