The invention relates to a method for controlling a water sluice gate drive for a water sluice gate, in particular for a roller sluice gate, preferably in a hydroelectric power plant, wherein the drive has an electric machine, in particular has an asynchronous machine, in particular an asynchronous motor/generator. According to the invention, it is provided that the electric machine, in particular an asynchronous machine, has a fan brake, wherein the method comprises the steps of: disengagement of the fan brake in the case that an insufficient power supply is indicated, self-actuated operation of the electric machine, in particular an asynchronous machine, wherein the electric machine, in particular an asynchronous machine, is operated in generative island operation, in which a rotating field is generated in a self-actuating manner.

A system includes first and second dam modules, a power generation unit, and first and second turbine modules. The first dam module can be secured to a foundation of a dam site and redirect a first flow of water. The second dam module can be secured to the first dam module opposite the foundation and redirect a second flow of water. The first turbine module can be secured to the foundation. The second turbine module can be secured to the first turbine module opposite the foundation. The power generation unit includes a turbine to be driven by a third flow of water at least partially including at least one of the first flow of water or the second flow of water. The first turbine module includes a draft tube having an inlet to receive water from the turbine and an outlet to discharge water from the first turbine module.

A system includes first and second dam modules, a power generation unit, and first and second turbine modules. The first dam module can be secured to a foundation of a dam site and redirect a first flow of water. The second dam module can be secured to the first dam module opposite the foundation and redirect a second flow of water. The first turbine module can be secured to the foundation. The second turbine module can be secured to the first turbine module opposite the foundation. The power generation unit includes a turbine to be driven by a third flow of water at least partially including at least one of the first flow of water or the second flow of water. The first turbine module includes a draft tube having an inlet to receive water from the turbine and an outlet to discharge water from the first turbine module.

A flood protection system (10) on a watercourse (16) with a flood-prone area (18) includes a main pipe (12) along the watercourse (16) in this flood-prone area (18). At least parts of the watercourse (16) are guided through the main pipe (12) in the direction of flow (28). A drive turbine (62) in the main pipe (12) increases the flow velocity of the flowing water (16) in the main pipe (12) in the event of flooding, the main pipe (12) flowing back into the flowing water (16).

A flood protection system (10) on a watercourse (16) with a flood-prone area (18) includes a main pipe (12) along the watercourse (16) in this flood-prone area (18). At least parts of the watercourse (16) are guided through the main pipe (12) in the direction of flow (28). A drive turbine (62) in the main pipe (12) increases the flow velocity of the flowing water (16) in the main pipe (12) in the event of flooding, the main pipe (12) flowing back into the flowing water (16).