backwash surge drum

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environmental works — ▪ civil engineering Introduction infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations … Universalium
stream — Synonyms and related words: Brownian movement, X ray, Zeitgeist, abound, abundance, actinic ray, actinism, advance, affluence, afflux, affluxion, air current, ample sufficiency, ampleness, amplitude, angular motion, appear, arise, ascend,… … Moby Thesaurus

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