dragan

Old English dragan meant to draw or drag. A ship's draft (also draught in British spelling) is the vertical distance between the waterline and the lowest point of the hull. It measures how deeply the vessel is drawn into the water—how much water the ship 'draws.' The word moved from the action (dragging, drawing) to the result (the depth drawn). A ship that draws ten feet of water cannot enter a harbor shallower than ten feet.

Draft governed naval strategy before speed or armament. In 1588, the Spanish Armada's deep-drafted galleons could not pursue English ships into shallow coastal waters where Sir Francis Drake's fleet fled and regrouped. Philip II had built ships for the Atlantic, not the English Channel. Drake knew the draft figures; Philip's admirals did not. The difference was a shallow channel and an empire.

Brewers adopted the same word for beer drawn from a cask. A draft beer is pulled from a barrel—drawn out, like the ship's water. The verb 'to draft' — to draw up a document, to draft soldiers, to draft a plan — all trace to this pulling, this drawing out of something that exists potentially and must be made actual. A first draft is the first drawing-out.

Ship designers today speak of 'draft restrictions' for every major waterway. The Panama Canal's maximum draft is 39.5 feet. The Suez Canal allows 66 feet. The Thames at London Bridge allows 28 feet at low tide. These numbers determine which ships can reach which ports, and therefore which trade routes exist. A few feet of draft is the difference between global commerce and stranded cargo.