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Title: Herbert Hoover Dike, Dam Safety Modification Study: Appendix A. Dam Safety Action Decision Summary (DSADS)
Authors: United States. Army. Corps of Engineers. Jacksonville District.
Keywords: Dam safety
Okeechobee, Lake (Fla.)
Publisher: United States. Army. Corps of Engineers. Jacksonville District.
Abstract: Herbert Hoover Dike (HHD) is the primary infrastructure containing the waters of Lake Okeechobee, and requires urgent repairs to minimize risks to public safety and provide an increased level of economic, social and environmental security in the region. Remediation of the dike will significantly reduce the risk of economic damages to the south Florida agricultural industry and catastrophic impacts to the Everglades. Concerns regarding the dam’s ability to perform satisfactorily for lake levels above elevation 15.5‐ft NGVD (14.2‐ft NAVD) has resulted in its identification as a high‐risk project. Therefore, in 2006 HHD was assigned a Dam Safety Action Classification rating of 1. Without intervention, progression toward probable failure was confirmed to be taking place at several locations on the south and southeast sides of the embankment under elevated reservoir loading. Emergency repairs were completed at the locations where failure modes were observed to be progressing. Depending on the potential location of a breach, the life loss, economic, and adverse environmental consequences of a breach are considered very high. In recognition of the repairs needed at HHD, over $870 million has been invested in projects designed to reduce the risk of catastrophic failure of the aging structure. Actions taken include constructing an approximate 22‐mile long cutoff wall along the southeastern shore of Lake Okeechobee adjacent to the cities of Pahokee and Belle Glade, removing and replacing water control structures/culverts, and conducting a dam safety modification study (DSMS) to help ensure the safety of south Florida residents. Removal and replacement of the 32 Federal culverts is scheduled for completion in 2022, and construction of an additional 6.8‐mile cutoff wall is slated to begin in 2017 and be completed by 2020, as described in the 2015 Supplement to the Reach 1 Major Rehabilitation Report (MRR).
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