Plato, Laws 844c

γείτοσιν ὕδατος. ἐὰν δὲ ἐκ Διὸς ὕδατα γιγνόμενα, τὸν ἐπάνω γεωργοῦντα ἢ καὶ ὁμότοιχον οἰκοῦντα τῶν ὑποκάτω βλάπτῃ τις μὴ διδοὺς ἐκροήν, ἢ τοὐναντίον ὁ ἐπάνω μεθιεὶς εἰκῇ τὰ ῥεύματα βλάπτῃ τὸν κάτω, καὶ περὶ ταῦτα μὴ ἐθέλωσιν διὰ ταῦτα κοινωνεῖν ἀλλήλοις, ἐν ἄστει μὲν ἀστυνόμον, ἐν ἀγρῷ δὲ ἀγρονόμον ἐπάγων ὁ βουλόμενος ταξάσθω τί χρὴ ποιεῖν ἑκάτερον· ὁ δὲ μὴ ἐμμένων ἐν τῇ τάξει φθόνου

And if, when rain comes, any dweller on lower ground damages the farmer above him, or the adjoining dweller, by preventing its outflow,—or if, conversely, the man on higher ground damages the man below by letting out the floods carelessly,—and if, in consequence, they refuse to accommodate one another in this matter, any person who wishes shall call in a city-steward, if it is in the city, or a land-steward, if in the country, and get an order as to what each party is to do; and the man who does not abide by the order shall be liable to be charged with envy and frowardness,