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2. Floodgate - Wikipedia

   en.wikipedia.org/wiki/Floodgate

   Tainter gate diagram: Tainter gates and spillway: Drum gates are hollow gate sections that float on water. They are pinned to rotate up or down. Water is allowed into or out of the flotation chamber to adjust the dam's crest height. Drum gates are controlled with valves. Drum gates on a diversion dam

3. Automatic gain control - Wikipedia

   en.wikipedia.org/wiki/Automatic_gain_control

   Schematic of an AGC used in the analog telephone network; the feedback from output level to gain is effected via a Vactrol resistive opto-isolator.. Automatic gain control (AGC) is a closed-loop feedback regulating circuit in an amplifier or chain of amplifiers, the purpose of which is to maintain a suitable signal amplitude at its output, despite variation of the signal amplitude at the input.

4. Kaplan turbine - Wikipedia

   en.wikipedia.org/wiki/Kaplan_turbine

   A Bonneville Dam Kaplan turbine after 61 years of service. The Kaplan turbine is a propeller-type water turbine which has adjustable blades. It was developed in 1913 by Austrian professor Viktor Kaplan, [1] who combined automatically adjusted propeller blades with automatically adjusted wicket gates to achieve efficiency over a wide range of flow and water level.

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6. Gate (disambiguation) - Wikipedia

   en.wikipedia.org/wiki/Gate_(disambiguation)

   Gate (hydraulic engineering), a movable structure used to control the flow of fluid in a pipe or channel; Gate (water transport), the watertight door that seals off a chamber of a lock; Floodgate, an adjustable gate used to control water flow in flood barriers, lake, river, stream, or levee systems

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