A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Mystery of the Missing Cutoff: The History and Control of Seepage at the Eagle Mountain Lake Spillway
Eagle Mountain Lake is an integral part of the Tarrant Regional Water District (TRWD) water supply chain and was established in the late 1920s with construction of the dam and spillway completed in 1932. A large spillway improvement began in 1965 that included the construction of a side channel spillway that was completed in 1971. A section of embankment about 250 ft long remained between the two spillways. Persistent seepage has occurred between the spillway structures since construction, and a comprehensive analysis of the reservoir in the early 2010s identified the seepage as a credible dam safety risk. A review of the record data revealed documented seepage during the side channel spillway construction. Of interest, the geology includes interbedded layers of weakly cemented sandstone and shale, and the uppermost sandstone layer seeped and developed piping features during the side channel spillway construction. Design documentation revealed that a concrete cutoff wall was recommended, but for unknown reasons, this cutoff wall was never constructed. A grouting program was conducted in the early 2010s to address seepage along the base of the dam and spillway. This program was successful at the dam but did not yield the desired results at the spillway. TRWD implemented a supplemental study of the site and proposes to construct a deeper cutter soil mixing (CSM) cutoff system. The paper guides the audience through the site history, engineering analysis, results of the current study, and design basis for the supplemental improvements.
The Mystery of the Missing Cutoff: The History and Control of Seepage at the Eagle Mountain Lake Spillway
Eagle Mountain Lake is an integral part of the Tarrant Regional Water District (TRWD) water supply chain and was established in the late 1920s with construction of the dam and spillway completed in 1932. A large spillway improvement began in 1965 that included the construction of a side channel spillway that was completed in 1971. A section of embankment about 250 ft long remained between the two spillways. Persistent seepage has occurred between the spillway structures since construction, and a comprehensive analysis of the reservoir in the early 2010s identified the seepage as a credible dam safety risk. A review of the record data revealed documented seepage during the side channel spillway construction. Of interest, the geology includes interbedded layers of weakly cemented sandstone and shale, and the uppermost sandstone layer seeped and developed piping features during the side channel spillway construction. Design documentation revealed that a concrete cutoff wall was recommended, but for unknown reasons, this cutoff wall was never constructed. A grouting program was conducted in the early 2010s to address seepage along the base of the dam and spillway. This program was successful at the dam but did not yield the desired results at the spillway. TRWD implemented a supplemental study of the site and proposes to construct a deeper cutter soil mixing (CSM) cutoff system. The paper guides the audience through the site history, engineering analysis, results of the current study, and design basis for the supplemental improvements.
The Mystery of the Missing Cutoff: The History and Control of Seepage at the Eagle Mountain Lake Spillway
Verreault, Louis (author) / Koterba, Dorota (author) / Miller, Marc T. (author) / Easton, Chuck (author)
International Foundations Congress and Equipment Expo 2021 ; 2021 ; Dallas, Texas
IFCEE 2021 ; 369-382
2021-05-06
Conference paper
Electronic Resource
English
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