Constructed during 1965/66 to secure a 30 million gallon per day water supply to a rapidly developing copper and phosphate mining complex, the Phalaborwa barrage spans the Olifants river near the Kruger National Park boundary. Comprising a 770-ft long concrete structure in the river section with long rolled earthfill embankments on the flanks, the barrage stores 3,800 morgen ft. of water in an eight mile long reach of the river. The concrete section incorporates 22 radial gates, each 30 ft. wide by 28 ft. high. Salient features of the design, the model studies, the construction programme and the routine for operation of the barrage are descriptionbed.
This paper descriptionbed briefly some aspects of the experimental research on the South Mrican Railways into the conditions affecting the riding quality of railway vehicles. Parameters which influence the vertical riding quality of railway vehicles were given against the theory of forced vibrations. Results recorded during riding quality tests were found to be in good agreement with the theory. A method of simulating vertical oscillations of railway vehicles on a digital computer was outlined.