It seems that, at last, some of the inequalities in terms of road transport are being addressed. This encouraging trend became obvious during the SAICE presidential visit to the Bloemfontein Branch in July this year.
The finals of the AQUALIBRIUM SAICE-DFC Water Schools Competition were recently held at the Sci-Bono Discovery Centre in Newtown, Johannesburg. The competition never fails to excite the teams, spectators and everybody involved! At this year's event, Trevor Balzer, Chief Operations Officer of the Department of Water Affairs, addressed learners, explaining issues impacting on South Africa's water resources, and in particular water distribution networks.
The paper descriptionbes a numeric method for calculating the interception capacity of lateral kerb inlets of prescribed lengths. It discusses the proposition that on moderate to steep road gradients capacity can be substantially improved by incorporating an extended length of depressed gutter upstream of the inlet. Design charts for road crossfalls of between two per cent and six per cent are included.
The report discusses why lime is able to improve the physical properties of clayey soils. It briefly descriptionbes some of the background knowledge and points out that the improvements take place in two phases, first rapid amelioration and then cementation. The rapid amelioration is due to physical changes which make the material less clay-like. Cementation causes the increase in strength and is the result of a chemical reaction between the clay and lime.