Challenges in Managing an Aging Infrastructure, Lessons Learned from a near Miss at the Lake Manatee Dam-Paper

Paper

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The Lake Manatee Dam, a high-hazard drinking-water reservoir dam in Central Florida, was built in 1965–1967. From 1978 onward, inspections repeatedly documented conditions consistent with internal erosion and piping, including sinkholes, persistent seepage, settlement, voids, loose soils, wall movement, sediment in drains, and a sediment island downstream. Yet these signs were often treated separately or as routine deterioration. In 2012, inspectors described the dam as being in very good overall condition.<br /><br />A new inspection team in 2013 combined historical observations with additional investigations and concluded that the dam was severely distressed and at high risk of an uncontrolled reservoir release, particularly during heavy rainfall and prolonged spillway operation. Emergency measures followed, including installation of a deep seepage cutoff wall in 2014.<br /><br />The paper identifies several factors that may have contributed to the long failure to recognize the danger. Groupthink and reluctance to contradict earlier assessments or deliver bad news may have made later teams less likely to identify an emergency. In addition, inspections focused on changes since the previous visit. This approach can miss a slowly evolving problem and gradually normalize dangerous conditions.<br /><br />The author recommends assessing infrastructure from a fresh perspective, actively questioning previous interpretations, and integrating inspection and investigation records over time to identify trends. The case also points to a broader need for procedures that account for uncertainty when assessing the condition and risk of aging infrastructure.

Keywords

Lake Manatee Dam

internal erosion

piping

sinkholes

seepage

dam safety

inspection records

groupthink

aging infrastructure

seepage cutoff wall