'Upper' in the Bible

Then Yahweh said to Isaiah, "Go out to meet Ahaz, you and Shear-Jashub your son, at the end of the conduit of the upper pool on [the] highway of [the] washer's field.

And the king of Assyria sent Rabshakeh from Lachish to Jerusalem, to King Hezekiah, with a large army, and he stood by the conduit of the upper pool on [the] highway of [the] field of [the] washer.