The development of a dolomite risk management strategy for the Tlokwe City Council

Abstract

Development on dolomite poses a risk due to the possible formation of instability features such as sinkholes. Most of these features are however man-induced, and the risk associated with development on dolomitic areas can be mitigated through correct management. Therefore, since the Tlokwe City Council is accountable for safe development within its jurisdiction, a Dolomite Risk Management Strategy (DRMS) should be put in place. There are several factors that contribute to the risk for development on dolomite. These factors can be catagorised into two groups that should be considered during the hazard identification process, namely physical factors that consists of geology, geohydrology and geotechnical, and anthropogenic factors that consists of existing infrastructure and development, land use planning, as well as social structure and awareness. These factors are assessed by means of a risk assessment in order to obtain a disaster risk score for different areas within the study area. Based on this score, priority focus areas can be identified, mainly for critically important further research before any development can be allowed or mitigation measures implemented. Once these research activities are completed, a DRMS can be compiled based on the guidelines set by SANS 1936, which will promote the safety of people and property when further development on dolomite takes place. Urgent and interim mitigation measures are proposed to manage the risk during further research activities.