RobH_en_tn/job/28/11.md

He ties up the streams so they do not run

Here "ties up the streams" means damming or blocking the streams. Alternate translation: "He blocks the streams so they do not flow" (See: rc://en/ta/man/translate/figs-metaphor)

what is hidden there

This refers to things that people normally do not see because they are in the ground or underwater.