SYMPOSIA PAPER Published: 01 January 1992

Design and Construction of Cement-Bentonite Cutoff Wall for S.A. Murray Jr. Hydroelectric Station


The Sidney A. Murray Jr. Hydroelectric Station is the largest, low-head run-of-river hydroelectric facility in the United States. Located near Vidalia, Louisiana, the plant generates 192 MW of electric power from eight 24 MW units. The powerplant structure and abutment dams are subjected to differential hydraulic heads of up to 8m (26 ft) under the project flood conditions and up to 12m (39 ft) under extreme, emergency conditions. Plastic concrete cutoff was installed utilizing cement-bentonite mixes placed by the slurry trench method to control seepage and uplift under the structures. This paper presents design concepts, mix design, field installation procedures and test data of the cores from the installed cutoff. Permeability, Modulus of Elasticity and Pinhole erosion criteria were used as the main control parameters for acceptance of the work.

Author Information

Ramachandra, K
Swan, CH
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Developed by Committee: D18
Pages: 140–150
DOI: 10.1520/STP19729S
ISBN-EB: 978-0-8031-5191-8
ISBN-13: 978-0-8031-1427-2