Deterring fish by increasing the flow rate in bulb turbines

It has been observed that at hydro plants equipped with bulb units, large numbers of fish can become trapped for long periods of time in the draft tube during low flow conditions, when the turbines are shutdown. To mitigate this problem, non-physical barriers are the only deterrent available to minimize deleterious effects in the ichthyofauna. This study is part of a research and development project aiming to investigate the repellent effects caused by increasing the hydraulic flow rate in the fish biomass in the draft tube, during turbine shutdown.