These are formations with negligible permeability that are generally regarded as not containing groundwater in exploitable quantities. Water quality may also be such that it renders the aquifer as unusable. However, groundwater flow through such rocks, although imperceptible, does take place, and needs to be considered when assessing the risk associated with persistent pollutants.
Non Aquifer System
These aquifers yield small volumes of groundwater or poor quality groundwater. They are the last choice for exploration and include rocks of the Kirkwood Formation of the Uitenhage Group and igneous rocks in the north-western parts of the Northern Cape Province.
Why is the poor aquifer system important?
Poor aquifer systems hold little potential for development, they may provide crucial water supplies to both man and the environment on a limited scale.