hundreds of billions of gallons of water. and has one-third of the water supply for the state's population. we know the damage across the main spillway. and why 200,000 people have been evacuated, if this damage continues, and they're trying to fix the situation, and water has to be brought down from the emergency spillway, and a significant amount, that will be an uncontrolled amount of water, that can be just as bad, if the emergency spillway fails. that would be just as bad if the dam were to fail. about 100 feet of water could come towards the town of oroville for one hour. that's why the town has been evacuated. they're trying to aleleviate th situation. showing the timing of the event. that could bring the water down. officials saying the threat for this is being minimized because