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Docks Meaning and Conceptual Learning Docks Overview Docks are enclosed area used for berthing of ship to keep them at uniform level for loading and unloading of cargo or renovation. They are classified as : 1. Graving or dry dock 2. Floating dock 3. Marine Railways 4. Liff Docks • Graving or Dry Docks : It is a long excavated chamber which is having sidewalls, semicircular end walls, and floor. As it is having two ends, the open end is provided with a gate and acts as an entrance to the clock. The side walls formed with the series of steps known as altar courses to receive the ends of shores which support the vessel in a vertical position while being docked and such altar courses of granite to withstand heavy wear. Culvert provides for filling and emptying the dock. • Size of Dock :  Size depends on the size of largest ship it has to be a dry dock. Dry dock to handle modern big ships having 1000ft. in length, with an entrance width of 60ft. to 100ft. The ratio of length to breadth of