oa Civil Engineering = Siviele Ingenieurswese - Geological and geotechnical aspects of the Palmiet Scheme

Volume 31, Issue 11
  • ISSN : 1021-2000



The Palmiet project is located in rocks of the Table Mountain Group. These are the distinctive mountain building rocks prominent throughout the Western Cape and are characterized lithologically by quartzite and quartzitic sandstone. Apart from the distinctive shale band of the Cedarberg Formation there are other minor shale, siltstone and argillaceous horizons throughout the succession. The excavations for the work at Palmiet are entirely within the Nardouw formation, which has been extensively folded in a series of anticlines and synclines with axes generally in a northeast-southwest direction, i.e. more or less perpendicular to the line of the hydraulic conduit from the upper reservoir at Rockview to the power station. Numerous small scale folds and fold reversals are developed throughout this anticlinorium. The structure is characterized by the very distinct bedding planes delineating the folding and varying from thickly to very thickly bedded (300 mm to more than 1 000 m spacing).

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