One study showed that extreme precipitation increased by 4% per year after dams were built.

BBC: Reservoirs can make local flooding worse, says study

Neal directs the Center for the Study of Disasters and Extreme Events at Oklahoma State University.

NPR: FEMA's Expanded Responsibilities Questioned

Mr. DAVE NEAL (Director, Center for the Study of Disasters and Extreme Events, Oklahoma State University): The media could get in and Wal-Mart could get in a day afterwards.

NPR: FEMA's Expanded Responsibilities Questioned