Concise Bible Dictionary:
Four Hebrew words are translated “brook.”
1. aphiq (Psa. 42:1), water held in by banks, translated also “channel.”
2. yeor (Isa. 19:6-8), a river, canal, fosse: applied to the Nile in Exodus 1:22, &c.
3. mikal (2 Sam. 17:20), a small brook.
4. nachal (Gen. 32:23), a mountain torrent often dry in summer, and thus often disappointing, as in Job 6:15. Such are numerous in Palestine. (This is the word in all the passages where “brook” occurs in the Old Testament except those above enumerated.) The same is called in the New Testament, χείμαρρος, “winter flowing” (John 18:1). Its Eastern name is wady.
Wady Zerka – The Jabbok