Picture the floodgates

The door of water or in English lock is a device for controlling the depth of the vessel's cruise line including the inland / river cruise line and to the higher lane. Ship to go to the higher place enter the first room closed the door, then water from the second room flowed up to a certain height and then the ship sailed into the second room and so on. A very well-known canal equipped with locks is the Suez canal and the Panama Canal.
With the construction of river locks it can be navigated further upstream, so it will open up better passenger and freight access to the river

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