US Patent 9234325 Combined turbine/generator installation on a dam

Apparatus for positioning a hydroelectric turbine/generator in a dam having at least two spaced piers, the apparatus comprising (a) at least one first gate each spanning the space between a respective pair of neighboring piers and being movable to closed and open positions and positions therebetween to control flow and maintain head; and (b) at least one second gate, each second gate associated with a corresponding first gate upstream thereof and supporting at least one hydroelectric turbine/generator in a maintenance position and a plurality of operating positions such that in operating positions, water flows through each turbine/generator to produce electric power.