Jamieson, Fausset and Brown on Isaiah 19:10

10. in the purposes--rather, "the foundations," that is, "the nobles shall be broken" or brought low: so Is 3:1; Psa 11:3; compare Is 19:13, "The princes--the stay of the tribes. The Arabs call a prince "a pillar of the people" [Maurer]. "Their weaving-frames" [Horsley]. "Dykes" [Barnes].

all that make sluices, &c.--"makers of dams," made to confine the waters which overflow from the Nile in artificial fish-ponds [Horsley]. "Makers of gain," that is, the common people who have to earn their livelihood, as opposed to the "nobles" previously [Maurer].