Geology Bethal is situated on shale of the Middle-Ecca system, which in the vicinity of the town is penetrated by intensive Karoo dolerite. These rocks weathered to clay soils to form swells and shrinks with varying moisture content. Swelling clay with a low expansion rate, are a likely threat to buildings. Geology and soil conditions play an important consequence role in the selection of site for specific land use. In the case of Bethal, geological investigation was done and areas of development were indicated. Areas where development should be limited because of swelling clay problems, was also named. The limited areas fall mainly with the valleys and low-lying areas, which in any case forms part of the integrated open-space. Wind-Rose (winds diagram) From the dial, it is clear that the prevailing winds in the winter, from the north-west and during the summer, from the north-east. Together with the air drainage patterns, it played an important role in the placement of industrial areas in order to free Bethal of air pollution. The drafters ENGLISH DEFINITIONS NO: SO: NORTH-EAST (NE) SOUTH-EAST (SE) Heersende windrigting: dominant wind direction. SOMER: Summer. of Bethal Master Plan therefore found: Out of air purity point of view the most suitable location for industries north of the watershed, in the vicinity of the station, where industries already established, despite the fact that the Black neighbourhood is situated south of the town. * % Wind speed 1 – 10 km per hour 11 – 20 km per hour Source: Bethal Master Plan. 45
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