Hydraulic modelling of all significant structures including bridges is carried out using HEC-RAS and 2-dimensional models as needed. A particular challenge of such works in Zambia is the relatively few gauging stations, and limited reliability of rating curves. Rankin’s extensive experience in the use of ungauged models to predict stream flow has proven itself over time, using HEC-HMS for larger catchments as well.
Rankin has designed the rehabilitation of more than 1,300km of asphalt highways and supervised more than 1000km of reconstruction and rehabilitation works. In addition, the firm has rehabilitated feeder roads, undertaken access improvements and has been responsible for prominent works such as the dualization of the Kitwe-Chingola road, as well as one of the most complex road projects in Zambia – the Mongu-Kalabo road. Other challenging projects carried out include the design of the new access road to the Kafue Gorge Lower Hydro project, which saw 45km of new pavement through challenging escarpment terrain.
In feeder and community road sector development, Rankin’s philosophy of integration and community consultation allows it to transfer the skills of the project to the local community ensuring effective long-term care and maintenance of the road system.