Search results
Results from the WOW.Com Content Network
The exit gates are opened and the boat moves out. [11] If the lock were empty, the boat would have had to wait 5 to 10 minutes while the lock was filled. For a boat travelling upstream, the process is reversed; the boat enters the empty lock, and then the chamber is filled by opening a valve that allows water to enter the chamber from the upper ...
A caisson is a form of lock gate. It consists of a large floating iron or steel box. This can be flooded to seat the caisson in the opening of the dock to close it, or pumped dry to float it and allow it to be towed clear of the dock. Graving docks at Birkenhead, closed by a variety of ship caissons and floating (sliding) caissons.
The gates at both ends of the upper chamber are doubled for safety. Miraflores locks Gate operating machine. The gates separating the chambers in each flight of locks must hold back a considerable weight of water, and must be both reliable and strong enough to withstand accidents, as the failure of a gate could unleash a flood of water downstream.
Caisson lock. The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for water when conventional locks were used to raise and lower ...
In the 1830 design locks, the upper and lower gates are both the same height. [15] The majority of locks on the C&O canal are to this specification. Having the wickets in the gates, particularly if the gates are above the breast wall, means that the water pouring in could swamp some boats in the lock.
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 ...
Sluice. A sluice (/ slus / SLOOS) is a water channel containing a sluice gate, a type of lock to manage the water flow and water level. It can also be an open channel which processes material, such as a river sluice used in gold prospecting or fossicking.
Recreational Craft Directive. The Recreational Craft Directive, Directive 2013/53/EU, originally Directive 94/25/EC on recreational craft[1] amended by Directive 2003/44/EC, is a European Union directive which sets out minimum technical, safety and environmental standards for boats, personal watercraft, marine engines and components in Europe.