Periodic maintenance dredging as well as occasional enlarging and deepening of navigation channels are essential to accommodate commercial and recreational vessels. Without dredging, many harbors and ports would be impassable to cargo ships and passenger liners. Once sediments are dredged from the waterway, they are referred to as "dredged material." Therefore, they require underwater excavation or "dredging." After the initial excavation establishes a channel, periodic or "maintenance" dredging must be done to keep that channel clear and safe for navigation.
However, few rivers or harbors are naturally deep. Usage notes: often said about something unpleasant2.With their increased size, ships need improved navigation channels to enter and leave ports efficiently, quickly, and safely. I wouldn't want to dredge up the past It's the media who keep dredging it up mention something unpleasant from the past "Drag up old stories" Related Terms Dredge something up 1. an American trying to dredge up some French or German learned in high school If someone dredges up a damaging or upsetting fact about your past, they remind you of it or tell other people about it. "Newsweek magazine dredged up some remarks which he made last year." If someone dredges up a piece of information they learned a long time ago, or if they dredge up a distant memory, they manage to remember it. "Robertson tried to dredge up an image of her in his mind.", "From somewhere she dredged up a brilliant smile." Start talking again about something that happened a long time ago, especially something unpleasant. Find something after a lot of looking Pull something up from the bottom of a river, lake etc Manage to remember something, or to feel or express an emotion, with difficulty. Usage notes: often said about something unpleasant2. Definition of dredge up in English English dictionary 1.
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