Noun
sump pit (plural sump pits)
(chiefly US) A hole dug in the ground, beneath the basement of a house, in which rainwater or other moisture collect.
According to Fanshawe’s website, which was last updated November 2016 with the progress of the building, other features that have been in progress include installing underground tanks, a sanitary sump pit, and an elevator sump pit shortly. Source: Internet