1) How much water was released during the dam failure?
It is estimated that 12.6 billion gallons of water were released because of the dam failure.
2) How were people downstream warned of the coming flood, once people realized what was happening?
There was no advanced warning system in place. Instead officers had to rush to communities to warn them in person and telephone operators would call communities as well.
3) Take a little tour in Google Earth in the region, by searching for St Francis Dam. From your search, can you figure out how the water is now stored in this region to serve LA?
Water is still stored by a dam nearby the old dam location.