immissarium
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inmissarium Noun: neuter accusative singular, Noun: neuter vocative singular, Noun: neuter nominative singular, Noun: neuter genitive plural of immissarium
- a cistern or reservoir attached to an aqueduct, a distributing reservoir, Vitr. 8, 7.
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 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.