What does dewater mean?
Dewater is a verb meaning to remove water from something, most often from bulk materials, soils, or enclosed spaces where accumulated liquid poses an obstacle. The word belongs primarily to technical vocabulary: civil engineers speak of dewatering a building excavation before pouring foundations, mining engineers of dewatering flooded shafts and pits, and wastewater operators of dewatering sewage sludge so it can be handled and disposed of economically. Methods range from simple gravity drainage to wellpoint systems, pumps, filter presses, and centrifuges. The verb can also be used intransitively, describing a material that loses its contained water under drainage or filtration. Though rarely heard in casual speech — where 'drain' or 'dry out' serve instead — dewater is precise and widely understood within industry, making it a valuable term for anyone reading engineering reports, environmental assessments, or news coverage of mining and infrastructure projects.
verbTo remove water from something, especially by draining, filtering, or mechanical means. It is used chiefly in technical and industrial contexts such as mining, construction, wastewater treatment, and food processing.
- (transitive) To remove water from a material, structure, or area, especially by pumping or drainage — as in mines, quarries, excavations, or sludge.
- (intransitive) Of a solid or semi-solid material: to lose its contained water through drainage or filtration.
"The mine had to be continuously dewatered before the shaft could be extended."
"Engineers installed a network of wells to dewater the site before excavation began."
"In the treatment plant, centrifuges are used to dewater the sludge before disposal."
Before miners can dig deeper into the earth, they must first wage a constant battle against groundwater — and 'dewatering' is the name of that fight.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dewater
Dewater is formed transparently from the prefix de- ('removal, reversal') combined with water, following a productive English pattern seen in words like defrost and dehumidify. The word arose in technical English, with its use becoming established during the industrial era as large-scale mining and civil engineering created a practical need for a specific term for removing water from workings and materials. Its root, water, descends from Old English wæter, which shares a common Indo-European ancestry with cognates such as Greek hydro- (as in hydrology) and Russian voda (as in vodka).
How dewater is actually used
Dewater is a technical term found mainly in engineering, mining, geotechnical, and environmental contexts; it is rare in everyday conversation, where simpler words like 'drain' are preferred. Both transitive and intransitive uses exist, though the transitive use is more common.
Easily confused with dewater
Dehydrate means to remove all moisture from a person, animal, or substance (often with harmful or preservative effect), while dewater typically refers to removing free water from bulk materials, soil, sludge, or excavations in industrial settings.