Canadian Dam Association Bulletin - Fall 2011 - 16

CASE HISTORY SUMMARY

TAUM SAUK STORAGE DAM FAILURE, LESSONS LEARNED, AND THE REBUILD
Tom Hollenkamp, AmerenUE, St. Louis, Missouri, USA Craig Giesmann, AmerenUE, St. Louis, Missouri, USA Matt Frerking, AmerenUE, St. Louis, Missouri, USA ABSTRACT: The rockfi ll dike constructed in 1963 to form the Upper Reservoir at the Taum Sauk Pump Storage Project near Lesterville, MO failed abruptly on December 14, 2005. The Upper Reservoir has been rebuilt as a 2.84 million cubic yard (2.17 million cubic meters) RCC Dam in compliance with FERC Regulations and Missouri environmental permitting regulations. As the project is the largest RCC project constructed in the USA and it has a symmetrical cross-section with relatively low strength RCC, numerous design issues arose during the design process. The overall rebuild presented unique and challenging aspects. This paper summarizes the lessons learned during this historic rebuild. RÉSUMÉ: La digue de rockfi ll qui a été construit en 1963 avec le but de créer le Réservoir Supérieur au Projet de Stockage de Pompe de Taum Sauk près de Lesterville, Missouri a abruptement échoué le 14 Décembre 2005. Le réservoir supérieur a été reconstruit pour faire un RCC digue en 2,84 millions verges cubes (2,17 millions mètre cube) selon des règlements sur l’environnement et du Missouri FERC. Comme c’est le plus grand projet qui RCC a construit aux États-Unis et, comme il y a une section transversale symétrique avec une force relativement faible de RCC, il y avait
16

plusieurs défi s pendant la conception du projet. La totalité des défi s pour cette reconstruction a été unique et intéressante. Ce document résume ce qui a était appris pendant cette reconstruction historique. Name of site or structure: Taum Sauk Pump Storage Plant No. P-2277) (FERC Project Upper Reservoir Dam Location: Reynolds County, MO Type of event: Structural Failure of the Upper Reservoir Dam at the Taum Sauk Pump Storage Plant Date of event: December 14, 2005 Date of construction: Started in June 1960 and commercial operation began in December 1963. Rebuild started in October 2007 and commercial operation resumed in April 2010.

Reservoir, a shaft and tunnel conduit, the Powerhouse and a Lower Reservoir (Figure 1). The Plant’s Upper Reservoir is impounded by a dike and the Lower Reservoir is impounded by a dam across the Black River. The Upper Reservoir Dike was 6,562 feet (2,000.10 meters) long and kidney-shaped (Figure 2). The dike was a concrete-faced dumped rockfill dam with a maximum height in the range of 84 feet (25.60 meters) above the reservoir floor (Figure 3). The reservoir floor was generally at El. 1505 feet (459.72 meters) and the 12 feet wide (3.66 meters) crest of the dike was at El. 1589 feet (484.33 meters). A 10 feet high (3.05 meters), 1 foot thick (0.3 meter) reinforced concrete parapet wall on the crest of the dike extended the maximum pool to El. 1599 feet (487.38 meters).

1 SITE, STRUCTURE AND MATERIALS
The Taum Sauk Plant is located in Reynolds County, Missouri, on the East Fork of the Black River, approximately 90 miles (144.84 kilometers) southwest of St. Louis, Missouri. It is a reversible pumped storage project used to supplement the generation and transmission facilities of AmerenUE, having a 450-MW, two-unit pump-turbine. The facilities at Taum Sauk Plant consist of a ridge top Upper

Figure 1: Taum Sauk Plant Overview

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Canadian Dam Association Bulletin - Fall 2011

Table of Contents for the Digital Edition of Canadian Dam Association Bulletin - Fall 2011

Board of Directors
CDA Welcomes a New Executive Director
The Benefi ts of CDA Membership
President’s Message
Taum Sauk Storage Dam Failure, Lessons Learned, and the Rebuild
Future Challenges for Mactaquac Generating Station
Extreme Floods – Part 2
Notice of AGM
Annual Report
New This Issue - Association News Briefs
Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Fall 2011 - cover1
Canadian Dam Association Bulletin - Fall 2011 - cover2
Canadian Dam Association Bulletin - Fall 2011 - 3
Canadian Dam Association Bulletin - Fall 2011 - 4
Canadian Dam Association Bulletin - Fall 2011 - 5
Canadian Dam Association Bulletin - Fall 2011 - 6
Canadian Dam Association Bulletin - Fall 2011 - Board of Directors
Canadian Dam Association Bulletin - Fall 2011 - 8
Canadian Dam Association Bulletin - Fall 2011 - CDA Welcomes a New Executive Director
Canadian Dam Association Bulletin - Fall 2011 - 10
Canadian Dam Association Bulletin - Fall 2011 - The Benefi ts of CDA Membership
Canadian Dam Association Bulletin - Fall 2011 - 12
Canadian Dam Association Bulletin - Fall 2011 - President’s Message
Canadian Dam Association Bulletin - Fall 2011 - 14
Canadian Dam Association Bulletin - Fall 2011 - 15
Canadian Dam Association Bulletin - Fall 2011 - Taum Sauk Storage Dam Failure, Lessons Learned, and the Rebuild
Canadian Dam Association Bulletin - Fall 2011 - 17
Canadian Dam Association Bulletin - Fall 2011 - 18
Canadian Dam Association Bulletin - Fall 2011 - 19
Canadian Dam Association Bulletin - Fall 2011 - 20
Canadian Dam Association Bulletin - Fall 2011 - 21
Canadian Dam Association Bulletin - Fall 2011 - 22
Canadian Dam Association Bulletin - Fall 2011 - 23
Canadian Dam Association Bulletin - Fall 2011 - 24
Canadian Dam Association Bulletin - Fall 2011 - 25
Canadian Dam Association Bulletin - Fall 2011 - 26
Canadian Dam Association Bulletin - Fall 2011 - Future Challenges for Mactaquac Generating Station
Canadian Dam Association Bulletin - Fall 2011 - 28
Canadian Dam Association Bulletin - Fall 2011 - Extreme Floods – Part 2
Canadian Dam Association Bulletin - Fall 2011 - Notice of AGM
Canadian Dam Association Bulletin - Fall 2011 - Annual Report
Canadian Dam Association Bulletin - Fall 2011 - 32
Canadian Dam Association Bulletin - Fall 2011 - New This Issue - Association News Briefs
Canadian Dam Association Bulletin - Fall 2011 - Buyers’ Guide and Trade List
Canadian Dam Association Bulletin - Fall 2011 - cover3
Canadian Dam Association Bulletin - Fall 2011 - cover4
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