DEWATERING AT SALUDA DAM, COLUMBIA SOUTH CAROLINA

An extensive dewatering program has been implemented at the toe of Saluda Dam near Columbia, South Carolina. Dewatering is required to lower pore pressure within the existing dam during construction of a new back-up dam, as well as, to lower water levels below the excavation bottom. Over 80 deep wells, numerous shallow wells, and hundreds of jet-eductors were installed to remove groundwater. Hundreds of open standpipe piezometers and vibrating wire piezometers were installed to monitor phreatic levels and pore-pressure. Successful dewatering required a clear understanding of the subsurface geology and surface topography before the original dam was built.