Drainage

(drānīj.) (Civ. Engin.) The system of collecting and dispersing the residuum or excrementitious matters and waters of towns, lands, .;-more properly called sewerage. (Husbandry.) The art of carrying off water from the soil and subsoil of land, by means of open or closed drains or trenches-the term, however, being generally understood of closed drains. By means of D. the fertility of wet lands may be materially in. creased. [s. 301]