Flood Risk Management With Hec-Wat and the Fra Compute Option (PAP014369)

Código

PAP014369

Autores

Christopher N. Dunn, Penni R. Baker, Matthew J. Flemiing

Tema

Flood resilient societies through community preparedness

Resumo

The United States Army Corps of Engineers (USACE) has long had policy stating that USACE will analyze its water resources projects, including flood risk management projects, using risk analysis and watershed, systems and life-cycle approaches. However, the software to support these requirements and perform these analyses has not been available. The current software used within USACE to perform flood risk management analysis, HEC-FDA (Flood Damage Reduction Analysis), has a number of limitations that preclude it from readily or intuitively performing a true systems or life-cycle analysis. While HEC-FDA has been the primary flood risk assessment tool for USACE since 1996, it still represents a system of levees as a number of independent project components. For this reason and others, USACE's Hydrologic Engineering Center (CEIWR-HEC) began developing the Watershed Analysis Tool (HEC-WAT). HEC-WAT was initially developed to assist Project Delivery Teams (PDT's) conduct water resources studies of complex riverine systems with an integrated, comprehensive and systems based approach. However, since USACE also requires a life-cycle analysis, it became clear HEC-WAT needed additional capability that would allow a risk analysis to be performed while also incorporating a life-cycle approach. Therefore, the research and development scope grew as it became clear that USACE current tools and practices were still not able to address all USACE needs. Thus, HEC-WAT took on a more complex nature and the Flood Risk Analysis (FRA) compute option was added. This new capability allows HEC-WAT to run a Monte Carlo analysis so a robust risk analysis can be performed throughout the life-cycle. HEC-WAT/FRA includes systems and life-cycle approaches, event-based sampling, parameter sampling, and the ability to do scenario and alternative analyses. Applications of the FRA compute include levee certification studies, dam and levee safety studies, and planning and design studies. It will also advance USACE modeling approaches for flood risk analysis. An initial implementation of HEC-WAT/FRA has been constructed for the Columbia River Treaty (CRT) 2014/2024 Review project. The purpose of the CRT, which became effective in 1964, is to provide flood control and power benefits to the United States and Canada. The goal of the CRT Review is to provide United States decision makers with the necessary information to support a decision regarding the future of the CRT with Canada. While the Treaty has no expiration date, it can be terminated by either party in 2024, provided the other party has been given a ten year advance notice. CEIWR-HEC is a member of the PDT that is undertaking a series of studies to collect critical information needed to support the possible renegotiation of the CRT. This paper will describe the HEC-WAT/FRA and how it will be used to assess current treaty operations and possible future treaty alternatives. This presentation will also describe the scientific advancements included within HEC-WAT/FRA, how it was used to for the CRT study and how it will advance USACE modeling approaches for flood risk analysis.