Foreword
This report was prepared to provide a compendium of modifications of existing dams to illustrate what has been done, and to serve as a source of ideas for owners in need of improving their dams' performance during expected earthquakes. It consists of a general discussion on the modification of existing dams, 11 case histories of modifications, a table listing modifications by type, and a comprehensive list of references.
To prepare this report, the USSD Committee on Earthquakes reviewed technical literature and solicited contributions from major dam owners, regulatory agencies and consultants in the United States. The committee is grateful for those contributions. Donald H. Babbitt coordinated the committee's efforts and wrote the introductory section. Principal contributing authors were: Babbitt, Francis G. McLean, and Richard W. Kramer. Harry E. Thomas, a former member of the committee, provided the information from the Federal Energy Regulatory Commission files. George F. Horowitz edited the final draft.
USSD Committee on Earthquakes
Joseph L. Ehasz, Chairman
Gilles Bureau, Vice Chairman
Donald H. Babbitt
John A. Barneich
Moshen Beikae
Yusof Ghanaat
Robert L. Hall
George F. Horowitz
Peter J. Hradilek
C. Michael Knarr
Richard W. Kramer
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Thomas M. Leps
C. Eric Lindvall
Le Val Lund
Faiz I. Makdisi
Enrique E. Matheu
Francis G. McLean
Warren J. Paul
John C. Stossel
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Table of Contents
FOREWORD
USSD COMMITTEE ON EARTHQUAKES PUBLICATIONS
DAM MODIFICATIONS TO IMPROVE PERFORMANCE DURING STRONG EARTHQUAKES
TABLE 1: EXISTING DAMS MODIFIED
REFERENCES FOR TABLE 1
SELECTED CASE HISTORIES
Austrian Dam
Bear Valley Dam
Butt Valley Dam
Folsom Dam and Mormon Island Auxiliary Dam
Gibraltar Dam
Littlerock Dam
Pacoima Dam
Santee Cooper Project: Pinopolis West, Pinopolis East and Santee North Dams
Sardis Dam
Stewart Mountain Dam
Weber Dam
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