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2. Stoplogs - Wikipedia

   en.wikipedia.org/wiki/Stoplogs

   A gate may make use of one or more logs. Each log is lowered horizontally into a space or bay between two grooved piers referred to as a stoplog check. [3] In larger gate structures, there will be multiple bays in which stoplogs can be placed to better control the discharge through the structure.

3. Weir - Wikipedia

   en.wikipedia.org/wiki/Weir

   A notch weir is any weir where the physical barrier is significantly higher than the water level except for a specific notch (often V-shaped) cut into the panel. At times of normal flow all the water must pass through the notch, simplifying flow volume calculations, and at times of flood the water level can rise and submerge the weir without ...

4. Barbed wire - Wikipedia

   en.wikipedia.org/wiki/Barbed_wire

   As with any fence, barbed wire fences require gates to allow the passage of persons, vehicles and farm implements. Gates vary in width from 3.5 metres (12 ft) to allow the passage of vehicles and tractors, to 12 metres (40 ft) on farm land to pass combines and swathers.

5. Tainter gate - Wikipedia

   en.wikipedia.org/wiki/Tainter_gate

   Tainter gates are usually controlled from above with a chain/gearbox/electric motor assembly. A critical factor in Tainter gate design is the amount of stress transferred from the skinplate through the radial arms and to the trunnion, with calculations pertaining to the resulting friction encountered when raising or lowering the gate.

6. Notch (engineering) - Wikipedia

   en.wikipedia.org/wiki/Notch_(engineering)

   Charpy test sample with a notch. In mechanical engineering and materials science, a notch refers to a V-shaped, U-shaped, or semi-circular defect deliberately introduced into a planar material. In structural components, a notch causes a stress concentration which can result in the initiation and growth of fatigue cracks.

7. Locks and weirs on the River Thames - Wikipedia

   en.wikipedia.org/wiki/Locks_and_weirs_on_the...

   The volume and speed of water down the river is managed by adjusting the gates at each weir. Occasionally this can result in a fast stream rendering navigation more hazardous. These conditions are indicated by yellow or red warning boards on the lock gates and the status of all locks is published by the Agency. [4]