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  2. Freeboard (nautical) - Wikipedia

    en.wikipedia.org/wiki/Freeboard_(nautical)

    In sailing and boating, a vessel's freeboard is the distance from the waterline to the upper deck level, measured at the lowest point of sheer where water can enter the boat or ship. [1] In commercial vessels, the latter criterion measured relative to the ship's load line , regardless of deck arrangements, is the mandated and regulated meaning.

  3. Open channel spillway - Wikipedia

    en.wikipedia.org/wiki/Open_channel_spillway

    Q mi = discharge capacity without freeboard (ft 3 /s) (In this case, freeboard is the vertical distance from the water surface to the dam crest when the water surface is at a lower elevation.) L = length of the spillway crest (ft) H = height of the sidewalls above the spillway crest (ft)

  4. Metacentric height - Wikipedia

    en.wikipedia.org/wiki/Metacentric_height

    In the diagram above, the two Bs show the centres of buoyancy of a ship in the upright and heeled conditions. The metacentre, M, is considered to be fixed relative to the ship for small angles of heel; however, at larger angles the metacentre can no longer be considered fixed, and its actual location must be found to calculate the ship's stability.

  5. Ship measurements - Wikipedia

    en.wikipedia.org/wiki/Ship_measurements

    Used mainly to determine the minimum water depth for safe passage of a vessel and to calculate the vessels displacement (obtained from ships stability tables) so as to determine the mass of cargo on board. Draft, Air – Air Draft/Draught is the distance from the water line to the highest point on a ship (including antennas) while it is loaded ...

  6. Under keel clearance - Wikipedia

    en.wikipedia.org/wiki/Under_keel_clearance

    Computer systems and software can be used to manage and calculate UKC for ships and ports. [8] [9] These include systems that dynamically manage UKC using models, forecasting and calculations. [10] The International Hydrographic Organization (IHO) sets a Standard for UKC Management for software and systems: S-129 Under Keel Clearance Management ...

  7. Air draft - Wikipedia

    en.wikipedia.org/wiki/Air_draft

    The vessel's clearance is the distance in excess of the air draft which allows a vessel to pass safely under a bridge or obstacle such as power lines, etc.A bridge's "clearance below" is most often noted on charts as measured from the surface of the water to the underside of the bridge at the chart datum Mean High Water (MHW), [3] [4] a less restrictive clearance than Mean Higher High Water ...

  8. Displacement (ship) - Wikipedia

    en.wikipedia.org/wiki/Displacement_(ship)

    Shipboard stability computer programs can be used to calculate a vessel's displacement. The process of determining a vessel's displacement begins with measuring its draft. [3] This is accomplished by means of its "draft marks". A merchant vessel has three matching sets: one mark each on the port and starboard sides forward, midships, and astern ...

  9. Superstructure - Wikipedia

    en.wikipedia.org/wiki/Superstructure

    The height and the weight of superstructure on board a ship or a boat also affects the amount of freeboard that such a vessel requires along its sides, down to her waterline. In broad terms, the more and heavier superstructure that a ship possesses (as a fraction of her length), the less the freeboard that is needed.