FLAGSTAFF, Ariz. (AP) — Federal scientists are launching an effort to better understand the hydrology in the U.S. West.

The U.S. Department of Energy on Tuesday announced a new kind of climate observatory near the headwaters of the Colorado River. Scientists say data gathered from the equipment will help better predict rain and snowfall in the region and determine how much of it will flow through the river.

The multimillion-dollar effort led by Lawrence Berkeley National Laboratory begins next week. The Colorado River serves 40 million people in several states and Mexico.

A recent shortage declaration means Arizona, Nevada and Mexico won't get their full allocations of water next year.

See How School Cafeteria Meals Have Changed Over the Past 100 Years

Using government and news reports, Stacker has traced the history of cafeteria meals from their inception to the present day, with data from news and government reports. Read on to see how various legal acts, food trends, and budget cuts have changed what kids are getting on their trays.