In this Friday, June 16, 2017, photo, hydraulic engineering professor Michael Johnson talks to reporters about the replica of the Oroville Dam spillway at Utah State University's Water Research Laboratory, in Logan, Utah. California water officials are relying on key hydrology tests being performed on the replica of the spillway to pinpoint what repairs will work best at the tallest dam in the U.S for a spillway that was torn apart in February. (AP Photo/Rick Bowmer)
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