Immissarium
A basin, trough, or other contrivance built upon the ground, of stone or brick, and
intended as a cistern to contain a body of water
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Immissarium. (Pompeii.)
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flowing from the reservoir (
castellum) of an aqueduct,
for the accommodation of the adjacent neighbourhood (Vitruv. viii. 6, 1). It differs from
cisterna, which was underground, and is shown by the preceding illustration.
The high vaulted building is the reservoir, from which the water flowed through the small dark
aperture at its bottom into the square stone trough (
immissarium) on the
level of the pavement. See
Aquaeductus.