Precipitation+and+Run-Off

=**Colorado River - The Headwaters**= Understanding how rivers flow requires an understanding of basic water cycle principles. About 90% of the water that flows in the Colorado River comes from the melting snow pack of the Rocky Mountains.

The video below visits the headwaters of the Colorado River.

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In order to understand how a river begins, it is important to understand the water cycle concepts below:
 * Precipitation
 * Run-off

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 * 1 acre-foot is equal to 325,851 gallons

Sources: "The Colorado River." //National Geographic //. National Geographic Society. Web. 04 Apr. 2012. .