Hydrogeological analysis of groundwater occurrence within the Limpopo Province
Existing literature is reviewed to investigate what delineation methodologies on groundwater occurrence already exists and could be applied to specifically the Limpopo Province. Valuable lessons learned during this study are that a vast range of research has been done and a lot of time already spent on methodologies to reach certain outcomes, but the accumulation of new groundwater data remains of cardinal importance to be able to understand the occurrence of groundwater in different areas. The importance of siting high yielding boreholes within the Limpopo Province and the amount of money and time that is spend on the development of sustainable groundwater resources highlights the importance of understanding the occurrence of potential high yielding water resources within the Limpopo Province. The GRIP database covering the Limpopo Province is one of the most comprehensive borehole databases in South Africa, making it the ideal dataset to test new groundwater delineation methodologies. The aim of this study was to make use of existing borehole data and associated datasets to formulate a delineation methodology to delineate areas based on groundwater occurrence within the Limpopo Province. An existing delineation methodology associated with Vegter’s analysis method was investigated to test applicability to the Limpopo Province. A classification tree method for delineation was developed to address the short comings of the existing delineation methodology and results are compared for a previous study where the existing methodology were applied. Finally, the newly formulated delineation methodology is applied to Vegter Region 7 as a case study. The standard Vegter analysis is also performed on Vegter Region 7 to investigate if further trends in the geohydrological data could be used to further sub-delineate areas of interest. The developed delineation methodology is based purely on borehole data, which is a dynamic data set so that the delineation can be updated as new borehole data becomes available. Consideration is also given to delineation across study area boundaries to ensure continuity of the result.