A Dam Design and Construction Committee (DDCC) task group recently completed a study of various methods that can be used to establish reservoir restrictions if unsafe conditions are observed at a dam. This presentation will provide an overview of methods, including simple, intermediate, and advanced approaches, that can be employed to establish the safe storage level. The appropriate levels of analysis should be based on the conditions observed at the structure and information available to evaluate its performance. The paper also explores the life cycle of a Reservoir Restriction including setting of a restriction level, revisions to the restriction level, lifting of the restriction to allow full storage and issuance of a zero storage restriction or breach order. Several case studies are included to demonstrate the approach for the various risk and condition levels.
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