18 The verb form is a Polel from שׁוּק (shuq, “be abundant”), a verb which appears only here and in Joel 2:24 and 3:13, where it is used in the Hiphil stem and means “overflow.”
19 Heb “you greatly enrich it.”
20 Heb “[with] a channel of God full of water.” The divine name is probably used here in a superlative sense to depict a very deep stream (“a stream fit for God,” as it were).
21 The pronoun apparently refers to the people of the earth, mentioned in v. 8.
22 Heb “for thus [referring to the provision of rain described in the first half of the verse] you prepare it.” The third feminine singular pronominal suffix attached to the verb “prepare” refers back to the “earth,” which is a feminine noun with regard to grammatical form.

In other versions

You visit the earth and water it;

you greatly enrich it;

the river of God is full of water;

you provide their grain,

for so you have prepared it.

You care for the land and water it;

you enrich it abundantly.

The streams of God are filled with water

to provide the people with grain,

for so you have ordained it.

You visit the earth and water it abundantly,

enriching it greatly.

God’s stream is filled with water,

for you prepare the earth in this way,

providing people with grain.

You take care of the earth and water it,

making it rich and fertile.

The river of God has plenty of water;

it provides a bountiful harvest of grain,

for you have ordered it so.

You care for the land and water it;

you greatly enrich it.

The stream of God is filled with waters.

You provide their grain,

for so you have established it.

Thou visitest the earth, and waterest it:

Thou greatly enrichest it

With the river of God, which is full of water:

Thou preparest them corn, when thou hast so provided for it.

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