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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. Floodgate - Wikipedia

    en.wikipedia.org/wiki/Floodgate

    Floodgates, also called stop gates, are adjustable gates used to control water flow in flood barriers, reservoir, river, stream, or levee systems. They may be designed to set spillway crest heights in dams , to adjust flow rates in sluices and canals , or they may be designed to stop water flow entirely as part of a levee or storm surge system.

  5. 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.

  6. Locks and weirs on the River Thames - Wikipedia

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

    This involved the construction of weirs in order to divert water into the mills. The weirs, however, presented an obstacle to navigation and to solve this problem locks were built alongside the weirs to enable boats to be moved between levels. Originally these were flash locks that were essentially removable sections of weir. A boat moving ...

  7. 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.

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