Lessons Learned

Intervention can stop or minimize consequences of a dam failure. Warning signs should not be ignored.

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Many earth-cut spillways have been constructed in erodible material that can result in unsatisfactory performance and breaching of the spillway. The integrity of all earth-cut auxiliary spillways should be evaluated to ensure that the design storm can be safely passed.

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Regular operation, maintenance, and inspection of dams is important to the early detection and prevention of dam failure.

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Seepage along penetrations through embankment dams should be controlled using a filter diaphragm instead of anti-seep collars.

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Site security is a critical aspect of dam safety that shouldn’t be overlooked or disregarded.

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Stability of the dam foundation and other geologic features must be considered during dam design.

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The first filling of a reservoir should be planned, controlled, and monitored.

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The hazard classification of a dam can change over time (hazard creep).

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Timely warning and rapid public response are critical to saving lives during a dam emergency.

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Uncontrolled vegetation on and around dams can hinder inspection and lead to serious structural damage, significant maintenance costs, and possible failure.

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