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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 ...
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.
Structures such as the Niederfinow Boat Lift limit the dimensions of vessels. As of 2012 a second lift is being constructed to a larger size. [needs update]The Classification of European Inland Waterways is a set of standards for interoperability of large navigable waterways forming part of the Trans-European Inland Waterway network within Continental Europe and Russia.
In 2017, the Port Authority of New York and New Jersey raised the clearance of the Bayonne Bridge to 215 feet (66 m), at a cost of $1.7 billion, to allow New Panamax ships to reach container port facilities at Port Newark–Elizabeth Marine Terminal. [17] Previously, only GCT Bayonne, Global Container, could handle the New Panamax ships.
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The courts, however, use an expanded definition and include into the scope of Title 33, for example, waters "frequented by small, pleasure-fishing crafts". [ 8 ] The center of the navigable channel lies on the thalweg , so in the international river law in case of disputed borders the border is assumed to follow the thalweg, as doing otherwise ...