The Land in Flood Control


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The Land in Flood Control


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Rivers by Design


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The United States has one of the largest and costliest flood control systems in the world, even though only a small proportion of its land lies in floodplains. Rivers by Design traces the emergence of the mammoth U.S. flood management system, which is overseen by the federal government but implemented in conjunction with state governments and local contractors and levee districts. Karen M. O’Neill analyzes the social origins of the flood control program, showing how the system initially developed as a response to the demands of farmers and the business elite in outlying territories. The configuration of the current system continues to reflect decisions made in the nineteenth century and early twentieth. It favors economic development at the expense of environmental concerns. O’Neill focuses on the creation of flood control programs along the lower Mississippi River and the Sacramento River, the first two rivers to receive federal flood control aid. She describes how, in the early to mid-nineteenth century, planters, shippers, and merchants from both regions campaigned for federal assistance with flood control efforts. She explains how the federal government was slowly and reluctantly drawn into water management to the extent that, over time, nearly every river in the United States was reengineered. Her narrative culminates in the passage of the national Flood Control Act of 1936, which empowered the Army Corps of Engineers to build projects for all navigable rivers in conjunction with local authorities, effectively ending nationwide, comprehensive planning for the protection of water resources.




Addicks-Barker Reservoirs


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On Borrowed Land


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The Land in Flood Control


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Alluvial Fan Flooding


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Alluvial fans are gently sloping, fan-shaped landforms common at the base of mountain ranges in arid and semiarid regions such as the American West. Floods on alluvial fans, although characterized by relatively shallow depths, strike with little if any warning, can travel at extremely high velocities, and can carry a tremendous amount of sediment and debris. Such flooding presents unique problems to federal and state planners in terms of quantifying flood hazards, predicting the magnitude at which those hazards can be expected at a particular location, and devising reliable mitigation strategies. Alluvial Fan Flooding attempts to improve our capability to determine whether areas are subject to alluvial fan flooding and provides a practical perspective on how to make such a determination. The book presents criteria for determining whether an area is subject to flooding and provides examples of applying the definition and criteria to real situations in Arizona, California, New Mexico, Utah, and elsewhere. The volume also contains recommendations for the Federal Emergency Management Agency, which is primarily responsible for floodplain mapping, and for state and local decisionmakers involved in flood hazard reduction.




From Flood Control to Integrated Water Resource Management


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The loss of life and devastation in the Gulf coast region of the United States following the hurricane season of 2005 has led to considerable debate about what should be done and not done in recovering from the damage and mitigating the consequences of future floods. this document reports the experiences of four major floods since 1948 (two in the United States, one in the Netherlands, and one in China), to draw lessons for the Gulf coast restoration effort. The authors conclude that (1) attending to history leads to mitigating the potential damage of floods even when major floods are few and far between; (2) the critical concept of integrated water resource management policy -- particularly its implication that flood damage control includes conceding land to the water from time to time -- is necessary but may be difficult to accept; (3) delineating roles and responsibilities clearly in advance produces better outcomes; and (4) out of disaster can come improvements to the social and physical infrastructure that go beyond flood protection.