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Abstract

GROUNDWATER EXPLORATION The fractured rock groundwater systems of the TMG constitute a vast aquifer system, extending from just north of Nieuwoudtville southwards to Cape Agulhas and eastwards to Port Elizabeth. The full volume of the aquifer rocks in this whole region comprises a staggering 100 000 km3. The groundwater intersections or pathways in the aquifer are commonly at depths of greater than 100 m below ground. The recharge to the TMG aquifer is believed to be in the range of 7% to 23% of mean annual precipitation (i.e. snow, rainfall and mist). Groundwater from this aquifer is said to be among the purest in the country as regards electrical conductivity and total dissolved solids. However, the pH is as low as 5, which is very acidic and therefore corrosive. This means that, should bulk water supply from the TMG aquifer ever be considered, some form of treatment will have to be included to ensure that the water is of potable standard and to minimise damage to water distribution infrastructure.

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