"The Midwest Flood of 1993 was a significant hydro-meteorological event. Flood flows similar to those experienced by most of the Midwest can occur at any time. During the decade ending in 1993, average annual flood damages in the United States exceed $3 billion. Flood damages are a national problem. Excessive rainfall, which produced standing water, saturated soils, and overland flow, caused major damages to upland agriculture and some communities. In turn, runoff from this rainfall created, throughout tie basin, flood events that became a part of the nation's 1993 TV experience. Damages overall were extensive: between $12 billion and $16 billion that can be counted, and a large amount in unquantifiable impacts on the health and well-being of the population of the Midwest. Human activities in the floodplains of the Midwest over the last three centuries have placed people and property at risk. Local and federal flood damage reduction projects were constructed to minimize the annual risk, and, during the 1993 flood, prevented nearly $20 billion in damages. Some of these programs, however, attracted people to high risk areas and created greater exposure to future damages. In addition, flood control, navigation, and agricultural activities severely reduced available floodplain habitat and compromised natural functions upon which fish and wildlife rely. Over the last30 yearn the nation has learned that effective floodplain management can reduce vulnerability to damages and create a balance among natural and human uses of floodplains and their related watersheds meet both social and environmental goals."
U.S. Army Corps of Engineers, Rock Island, Illinois: http://www.mvr.usace.army.mil/