Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

This paper presents a description of the investigation performed on two leaking earthfill dams and the remedial measures undertaken to repair the dams. The dams are located at a large nursery operation that collects and stores excess irrigation water and storm water in five large on-site reservoirs. The both dams were built in 2001 and 2002 to increase the nursery’s storage capacity by 40 percent. In June 2004 water was found leaking into the outlet pipe in one of the dams through the joints and around the outside of the outlet pipe at the toe of the dam. Geosyntec was contacted to perform an investigation to find the cause of the leak and to identify potential repair options. During the initial observation, evidence of significant piping was discovered that indicated the dam may be unserviceable in its present condition. The outlet pipe was, therefore, excavated and removed. During repairs to the first dam the second dam began leaking as well. Subsequently this dam was also excavated and repaired. This paper will present the results of the investigations performed prior to and during excavation, and a discussion of the repair measures undertaken after the forensic investigation was completed.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Investigation and Repair of a Leaking Earthfill Dam

Arlington, Virginia

This paper presents a description of the investigation performed on two leaking earthfill dams and the remedial measures undertaken to repair the dams. The dams are located at a large nursery operation that collects and stores excess irrigation water and storm water in five large on-site reservoirs. The both dams were built in 2001 and 2002 to increase the nursery’s storage capacity by 40 percent. In June 2004 water was found leaking into the outlet pipe in one of the dams through the joints and around the outside of the outlet pipe at the toe of the dam. Geosyntec was contacted to perform an investigation to find the cause of the leak and to identify potential repair options. During the initial observation, evidence of significant piping was discovered that indicated the dam may be unserviceable in its present condition. The outlet pipe was, therefore, excavated and removed. During repairs to the first dam the second dam began leaking as well. Subsequently this dam was also excavated and repaired. This paper will present the results of the investigations performed prior to and during excavation, and a discussion of the repair measures undertaken after the forensic investigation was completed.