Location

St. Louis, Missouri

Date

08 May 1984, 8:00 am - 10:00 am

Abstract

Late in the summer of 1980, the dam for Snowbird Lake in Forestport, New York, U.S.A., experienced a serious foundation leak made evident by a suddenly erupting geyser near the downstream toe. Subsequent investigation indicated that a severe piping condition had occurred in the soil foundation. Some degree of erosion had effected the foundation earth for more than half of the dam length. Repairs were performed after dewatering the dam work area. The original dam was retained but provided with a new concrete foundation which included a constructed underdrain. A clay blanket was installed on the dam's upstream side to retard future underdam seepage. An emergency spillway circumventing the dam area was established to protect the dam abutments from being topped should the lake reach flood levels.

Department(s)

Civil, Architectural and Environmental Engineering

Meeting Name

1st Conference of the International Conference on Case Histories in Geotechnical Engineering

Publisher

Missouri University of Science and Technology

Document Version

Final Version

Rights

© 1984 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 6th, 12:00 AM May 11th, 12:00 AM

Failure of a Small Gravity Dam and the Repair

St. Louis, Missouri

Late in the summer of 1980, the dam for Snowbird Lake in Forestport, New York, U.S.A., experienced a serious foundation leak made evident by a suddenly erupting geyser near the downstream toe. Subsequent investigation indicated that a severe piping condition had occurred in the soil foundation. Some degree of erosion had effected the foundation earth for more than half of the dam length. Repairs were performed after dewatering the dam work area. The original dam was retained but provided with a new concrete foundation which included a constructed underdrain. A clay blanket was installed on the dam's upstream side to retard future underdam seepage. An emergency spillway circumventing the dam area was established to protect the dam abutments from being topped should the lake reach flood levels.