Job 6:16 - Joseph Benson’s Commentary on the Old and New Testaments

Which are blackish, &c. Which in winter, when the traveller neither needs nor desires it, are full of water congealed by the frost. Wherein the snow is hid Under which the water from snow, which formerly fell, and afterward was dissolved, lies hid. So he speaks not of those brooks which are fed by a constant spring, but of them which are filled by accidental falls of water or snow.