On-Demand Webinar: Dam Safety with 3D Weirs

Inadequate spillway capacity, significant hydrologic loadings on embankments and structures, and operation and maintenance are common dam safety issues, instigating the need for risk-reduction measures and/or rehabilitation. 3D weirs, or weirs with a crest length greater than the spillway width, are a particularly efficient approach to reduce these concerns. These weirs are also commonly used in new dams and may be useful as levee spillways. In some cases, these structures may be an alternative to gated spillways, which require operation and maintenance and can cause downstream flooding from misoperation or failure. Examples of 3D weirs include: arced or curved weirs, box-inlet drop spillways, labyrinth and piano-key weirs, and labyrinth fuse gates. Because of their hydraulic performance and site-adaptive geometries, these types of weirs are of increasing interest to those involved in dam safety, including practitioners, researchers, regulators, and dam owners. However, these spillways have complex hydraulic behaviors and can be challenging to develop efficient designs.

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