τὸ ἐγδοχῖον τοῦ ὕδατος καὶ τὰ ἐν τῆι πόλει ὑδραγώγια → the water reservoir and the conduits in the city (or on the acropolis)
καθέν: ἀντὶ καθ’ ἕν, ἴδε κατὰ Β. ΙΙ. 4.