The valve, located on the top floor of the eight-floor building, failed Saturday, spilling 400 gallons of water a minute for about an hour before it could be contained.
The leak was detected by an alarm system at about 12:30 p.m. Saturday.
Damage was heaviest in the floors, ceilings and walls in administrative offices on the sixth and seventh floors, which house the colleges of Education, Arts and Sciences and the School of Public Service. Water flowed to lower floors, as well, but damage was mostly limited to the elevator lobbies.
The entire building will be closed for at least a week as cleanup crews work to repair the damage. Some portions of the building will be closed for a longer period. The adjacent Science Building was not damaged and remains open.
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About two dozen summer session classes were scheduled to be held in the building this week. All of those classes have been moved to other buildings on campus. More than 1,000 students were notified about the changes.
Updated information will be available online. Students, faculty and staff members with questions can call (208) 426-4991.