The phrase "the east and the west" refers to the people who live all over the earth. AT: "you cause people everywhere to shout joyfully" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-merism]])
This refers to the supply of water in the sky that God sends to water the earth and fill the streams. AT: "you fill the streams with water" (See: [[rc://en/ta/man/translate/figs-metonymy]])