Phoenix Rainfall and Water Distribution

The topic of water often begins with rain. Arizona’s three distinct geographic regions have dramatically different rainfall: average annual rainfall ranges from 3 inches in Yuma to over 36 inches in the higher elevations along the Mogollon Rim and in the White Mountains. At 113,909 square miles, Arizona is the sixth largest state in the union, and despite its relatively dry nature, it contains 28 major rivers.  Many of these rivers are dry channels that flow only when it rains.

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