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In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.
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 ...
Since 1918, the term generally has been limited to a warship with an extensive flight deck designed to operate conventional fixed-wing aircraft. In US Navy slang, also called a "flat top" or a "bird farm". air draft air draught maximum vertical extent of any part of the vessel above the water surface. Clearance required for passing under a ...
Bridge clearance: 300 ft (91 m) horizontal; 52 ft (16 m) vertical. Although Congress originally authorized USACE to dredge the channel to a depth of 12 ft (3.7 m) in 2005, it did not provide the funds to do so. ODOT says that the capacity of each barge could be increased by 200 tons for each foot of draft. [4]
A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed. The name comes from the French term for balance scale, which
A ship canal therefore typically offers deeper water and higher bridge clearances than a barge canal suitable for vessels of similar length and width constraints. [ 2 ] Ship canals may be specially constructed from the start to accommodate ships, or less frequently they may be enlarged barge canals or canalized or channelized rivers .
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A bridge (also known as a command deck), or wheelhouse (also known as a pilothouse), is a room or platform of a ship, submarine, airship, or spaceship from which the ship can be commanded. When a ship is under way, the bridge is manned by an officer of the watch aided usually by an able seaman acting as a lookout.