An investigation to relate some of the Atterberg Limits to the compression indices and specified void ratios of remolded clay samples from the vicinity of Stellenbosch was carried out. A parallel displacement of the Uquld limit (L.L.) versus compression Index (C) curve to that obtained by Skempton, was observed. A marked relationship was found between the plastic limit (P.L.) and an arbitrarily chosen void ratio (e). The rapid rrmfwd of performing~ the consolidation test as had been proposed by Hsuan-Loh Su,' was employed. Three samples were tested by means of the 24 hour conventional method to serve as a control to the rapid tndluxi. Satisfactory values of compression Indices were obtained from the rapid "",.(fwd. but values of the coefficient of consolidation (0,) were found to be too hl~h.
The paper descriptionbed the main design features of the dam, diversion culvert, intake shaft, spillway, treatment plant and other ancillary works. The construction of the various embankment material zones were dealt with. The dam was constructed by a target estimate contract. Details of the pipeline were also given.
Major topograprlical, geotechnical, geometric and environmental challenges had to be overcome in the design and construaion of the R61 between Tombo and Port St Johns, one of the nominees for SAlCE's 1992 National Award for Outstanding Civil Engineering Achievement.