Draft PPS18: Renewable Energy
Annex 1 Small Hydro Planning Issues: Fisheries Interests
Concern has been expressed that fish, in some instances, have been killed or injured by hydropower schemes. This risk can be minimised by careful design and adjustment of the seasonal operating schedule of the plant. Some types of turbine (such as low to medium head crossflow designs) can oxygenate the river water and may thereby benefit the fish population. Where necessary, dams and weirs should include structures which allow free passage of migratory fish, and afford fish and other freshwater animals protection from the turbines while maintain flows.