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USGS: How much rain fell during a storm?

The USGS has a nice tool for calculating the total amount of rain that fell in a storm.  You can find it at their Water School site at http://water.usgs.gov/edu/activity-howmuchrain.html.  Based on this tool, it has been estimated that the amount of rain that fell in the South Carolina flood was 11 trillion gallons of water, according to USA Today here.

Source: Derek Harper, Commons Wikimedia

Source: Derek Harper, Commons Wikimedia