LSJ
ὁ, one who furnishes water for irrigation, POxy. 729.13, 2128.2 (ii AD, pl.), etc. ; — hence ὑδροπαροχία, ἡ, Supp.Epigr. 4.515.10 (Ephesus, i AD), POxy. 137.22 (vi AD); ὑδροπαρόχιον, τό, PLond. 3.776.19; ὑδροπαροχισμός, ὁ, POxy. 1590.10 (iv AD).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)