Did NEPA Drown New Orleans? The Levees, the Blame Game, and the Hazards of Hindsight

This Article highlights the. hazards of hindsight analysis of the causes of catastrophic events, focusing on theories of why the New Orleans levees failed during Hurricane Katrina in 2005 and particularly on the theory that the levee failures were caused by a 1977 National Environmental Policy Act (NEPA) lawsuit that resulted in a temporary injunction against the Army Corps of Engineers\u27 hurricane protection project for New Orleans. The Article provides a detailed historical reconstruction of the decision process that eventuated in the New Orleans storm surge protection system, focusing both on the political and legal factors involved and on the standard project hurricane risk assessment model that lay at the heart of the Army Corps of Engineers\u27 decisionmaking process. The Article then offers a detailed analysis. of how and why Hurricane Katrina overcame the New Orleans levee system. As this analysis demonstrates, the argument that the NEPA lawsuit played a meaningful causal role in the Katrina disaster is not persuasive. Parallel lessons are then drawn for forward-looking disaster policy. The same problems of uncertainty and complexity that confound the attempt through hindsight to attribute causal responsibility for a disaster also confound the attempt to predict using foresight the variety of outcomes, including potentially disastrous ones, that may flow from policy choices. Focusing narrowly on any single parameter of complex natural and human systems is likely to dramatically distort environmental, health, and safety decisionmaking, whether the parameter is a standard project hurricane when planning a hurricane protection plan, or the equally mythical lawsuit that sunk New Orleans when attempting to allocate responsibility for the plan\u27s failure some forty years later

A two-layer control architecture for operational management and hydroelectricity production maximization in inland waterways using model predictive control

This work presents the design of a combined control and state estimation approach to simultaneously maintain optimal water levels and maximize hydroelectricity generation in inland waterways using gates and ON/OFF pumps. The latter objective can be achieved by installing turbines within canal locks, which harness the energy generated during lock filling and draining operations. Hence, the two objectives are antagonistic in nature, as energy generation maximization results from optimizing the number of lock operations, which in turn causes unbalanced upstream and downstream water levels. To overcome this problem, a two-layer control architecture is proposed. The upper layer receives external information regarding the current tidal period, and determines control actions that maintain optimal navigation conditions and maximize energy production using model predictive control (MPC) and moving horizon estimation (MHE). This information is provided to the lower layer, in which a scheduling problem is solved to determine the activation instants of the pumps that minimize the error with respect to the optimal pumping references. The strategy is applied to a realistic case study, using a section of the inland waterways in northern France, which allows to showcase its efficacy.Peer ReviewedPostprint (author's final draft

Did NEPA Drown New Orleans? The Levees, the Blame Game, and the Hazards of Hindsight

This Article highlights the. hazards of hindsight analysis of the causes of catastrophic events, focusing on theories of why the New Orleans levees failed during Hurricane Katrina in 2005 and particularly on the theory that the levee failures were caused by a 1977 National Environmental Policy Act (NEPA) lawsuit that resulted in a temporary injunction against the Army Corps of Engineers\u27 hurricane protection project for New Orleans. The Article provides a detailed historical reconstruction of the decision process that eventuated in the New Orleans storm surge protection system, focusing both on the political and legal factors involved and on the standard project hurricane risk assessment model that lay at the heart of the Army Corps of Engineers\u27 decisionmaking process. The Article then offers a detailed analysis. of how and why Hurricane Katrina overcame the New Orleans levee system. As this analysis demonstrates, the argument that the NEPA lawsuit played a meaningful causal role in the Katrina disaster is not persuasive. Parallel lessons are then drawn for forward-looking disaster policy. The same problems of uncertainty and complexity that confound the attempt through hindsight to attribute causal responsibility for a disaster also confound the attempt to predict using foresight the variety of outcomes, including potentially disastrous ones, that may flow from policy choices. Focusing narrowly on any single parameter of complex natural and human systems is likely to dramatically distort environmental, health, and safety decisionmaking, whether the parameter is a standard project hurricane when planning a hurricane protection plan, or the equally mythical lawsuit that sunk New Orleans when attempting to allocate responsibility for the plan\u27s failure some forty years later

Remote sensing and hydrologic models for performance assessment in Sirsa Irrigation Circle, India

Irrigation management / Irrigation systems / Irrigation canals / Performance evaluation / Remote sensing / GIS / Models / Irrigated farming / Hydrology / Satellite surveys / Irrigation scheduling / Evapotranspiration / India