Psalm 1/Notes/Phrasal.v. 3.87603
From Psalms: Layer by Layer
The phrase "water channels" (פַּלְגֵי מָיִם) similar to the words "he rehearses... day and night" (יֶהְגֶּה יוֹמָם וָלָיְלָה) in the previous line (v. 2). The effect of this poetic feature (alliteration) is to draw a connection between the act of meditating on YHWH's instruction (v. 2b) and the water channels that nourish the tree (v. 3a).