Only one year after taking possession of the Milner Park showgrounds, three major faculties of the University of the Witwatersrand and 4500 students will have moved to the university's new West Campus across the M1 motorway. This is quite a tour de force for the planning departments of Wits, the four professional teams, the five contractors and the project management company. Particularly when seen in the light of the size of the project, the difficulties of renovation on this scale,the co-ordination of the eight contracts and the problems of working on a site for which no or inaccurate plans exist for services and existing buildings.
The very high costs associated with meeting generally accepted storage norms for urban reservoirs, such as 48 hours of average dally demand, together with rare or lack of failure of reservoirs which do not meet these standards, prompted some investigations.
Nearly all of South Africa's water requirements are drawn from surface resources. It is generally accepted that demand will exceed the exploitable resources within the next 40 years. A reliable means of evaluating surface water resources is therefore essential to planners, designers and managers of water supply schemes. The paper discussed the problems involved in a country-wide appraisal of surface water resources, with reference to a recenlly undertaken survey of South Africa. The paper descriptionbed how spatial and temporal extrapolation of stream flow observations was accomplished with the aid of a deterministic rainfall-runoff model which lakes into account land use changes. Also descriptionbed were the techniques employed for statistical analysis of low records to provide information for determination of storage yield at virtually any locality in the country. Some results of the new wafer resources survey were presented.