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Entrance Locks of Harbors and Docks Entrance Locks are those which give access to docks Components of Entrance Locks 1) Chamber: which is enclosed by quays wall on each side and bottom is paved by inverted arch flooring which resists upward water pressure when lock level is low 2) The gates closing entrance constructed of wood or iron of heavy design to withstand water pressure 3) The sill is raised above the gate floor by 2 foot 4) Sluice way   provided in side walls for filling and emptying locks Dimensions of Entrance and Locks It main factor are width, size, and displacement of the longest vessels. Modern locks have width vary from 80 foot and above and depth 25 foot to 40 foot and length of 800 foot and over. Construction of Entrance and Locks Materials   generally used are: 1)Wood 2)Iron Wooden Gates It consists of a horizontal beam that is spaced closer at the bottom to resist water pressure and joined together by heel post in such a way that two extreme ends meet at middle. Ir