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The US Army Corps of Engineers (USACE) is currently looking at variable temporal and geographic scales for total water level and event loading projections including storm description and characterisation relevant to project design and performance. USACE projects and event description must transition from engineering to planning to economics and project management. Capturing and articulating the appropriate level of uncertainty is important to a realistic projection of resultant risk. Close collaboration with national and international experts is an essential component in USACE's process of developing practical, nationally consistent, and cost-effective measures to reduce potential vulnerabilities resulting from global changes. The USACE's approach to developing guidance for evaluating and adapting to sea level change and total water level assessment are good examples of this collaboration. A primary focus at this time is the examination of methods and tools available at graduated levels of a project study. For project-level use, the USACE is defining specific assessments of components of total water level in addition to their varying impacts on project stability and performance. The required planning and risk assessment products for each performance type will be explained. The goal is to project adequately and cost-effectively future climate contributors that can result in various levels of project non-performance in a manner that will support effective long-term planning and project expenditures.

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