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Water Reconciliation Strategy Study for the Bulk Water Supply Systems: Greater Bloemfontein Area 31 The groundwater resource potential for Dyke Group D is estimated at 1 331 m 3 /d. The number of dykes of the dolerite group is 5 with a combined length of 8.0 km upon, which 22 potential boreholes are spaced for calculation purposes. Summary of the Results Groundwater Resource Potential of the Intrusive Dolerite Structures This section combines the groundwater potential estimation, which includes the recharge based approach as the lower boundary and the geometric mean approach as the upper boundary of the estimated groundwater potential range. The summary of the estimated groundwater resource potential for the delineated dyke groups are as follows: The groundwater resource potential for Dyke Group A is estimated in the order of between 658 to 847 m 3 /d. The groundwater resource potential for Dyke Group B is estimated in the order of between 7 651 to 12 761 m 3 /d. The groundwater resource potential for Dyke Group C is estimated in the order of between 743 to 1 210 m 3 /d. The groundwater resource potential for Dyke Group D is estimated in the order of between 1 331 to 1 370 m 3 /d. The estimated costing for developing the proposed borehole fields only includes the cost for the geophysical siting, percussion drilling, aquifer test pumping, pump equipment and pump house structure costs of the proposed borehole fields and do not include the cost of the surface infrastructure such as the electrical supply lines and pipeline networks and associated reservoirs etc. The estimated costing for developing the borehole fields are as follows: The estimated cost for the development of the borehole field for Dyke Group A is R 2 576 000 The estimated cost for the development of the borehole field for Dyke Group B is R 37 769 000 The estimated cost for the development of the borehole field for Dyke Group C is R 3 580 000 The estimated cost for the development of the borehole field for Dyke Group D is R 3 938 000 DETERMINATION OF HIGH GROUNDWATER ABSTRACTION AREAS A high groundwater abstraction area hydrocensus was conducted to determine if groundwater is utilised extensively in a 10 -15 km radius around the community of Wepener. The hydrocensus was undertaken by means of aerial photographs. Five irrigation pivots were identified to the north east of Wepener. It is important to note that the irrigation pivots are situated next to the Caledon River. Therefore it is more likely that these irrigation pivots utilised surface water than groundwater. It is recommended that these areas be investigated to confirm the observation. Groundwater is also utilised by many farmers for domestic purposes at their farmsteads. Groundwater uses may include, drinking water purposes, washing of clothes and food preparation as well as watering of the farmstead gardens. FINAL CONCLUSIONS AND RECOMMENDATIONS It is concluded that 31 potential dolerite dykes was observed that can be further investigated. Information absent regarding the observed dolerite structures are that it is currently unknown if these structures are water bearing. If so what the true sustainable yields are of these structures, not the estimate yields, as well as the associated groundwater qualities. The desktop study indicate that it is viable to further investigate the groundwater resources of Wepener based on the numerous potential dolerite dykes observed in the vicinity of Wepener. It is recommended that any future orientated groundwater exploration study at least include the following components: Appendix 4 – Groundwater Potential Study for Small Towns June 2012
Water Reconciliation Strategy Study for the Bulk Water Supply Systems: Greater Bloemfontein Area 32 Geophysical siting of groundwater exploration boreholes; Percussion drilling of the boreholes; Aquifer test pumping of successfully drilled exploration boreholes according to DWA specifications to determine the sustainable yields of the newly drilled boreholes; Sampling of all successfully drilled boreholes to determine the groundwater quality of the local site aquifer; Aquifer test pumping analyses of data to calculate sustainable yields and pump schedules. Compilation of a Geohydrological Report. Appendix 4 – Groundwater Potential Study for Small Towns June 2012
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