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Water transportation is the intentional movement of water over large distances. Methods of transportation fall into three categories: Aqueducts, which include pipelines, canals, and tunnels container shipment, which includes transport by tank truck , tank car , and tank ship . towing, where a tugboat is used to pull an iceberg or a large water bag along behind it. Due to its weight, transportation of water is very energy intensive. Unless it has the assistance of gravity , a canal or long-distance pipeline will need pumping stations at regular intervals. In this regard, the lower friction levels of the canal make it a more economical solution than the pipeline. Water transportation is also very common along rivers and oceans .