INTRODUCTION: Corps of Engineers planners have been required to consider risk and uncertainty since the Principles and Standards Act of 1972. The Actions for Change are increasing the Corps of Engineers’ reliance on risk-informed analysis and decision making. An informal review of the Corps’ experience with ecosystem restoration plans has shown few, if any, systematic efforts to address the oft...

The Corps of Engineers Institute for Water Resources (CEWRC-IWR) is part of the Water Resources Support Center in Alexandria, VA. It was created in 1969 to analyze and anticipate changing water resources management conditions, and to develop planning methods and analytical tools to address economic, social, institutional and environmental needs in water resources planning and policy. Since its ...

We consider the motion of a rigid body immersed in an incompressible perfect fluid which occupies a threedimensional bounded domain. For such a system the Cauchy problem is well-posed locally in time if the initial velocity of the fluid is in the Hölder space C. In this paper we prove that the smoothness of the motion of the rigid body may be only limited by the smoothness of the boundaries (of...