Development of a Reconciliation Strategy for All Towns in the Northern Region
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DEVELOPMENT OF A RECONCILIATION STRATEGY FOR ALL TOWNS IN THE NORTHERN REGION CAPRICORN DISTRICT MUNICIPALITY POLOKWANE LOCAL MUNICIPALITY Reconciliation Strategy for the Polokwane Cluster Including: Olifants Sands RWS, Mothapo RWS, Sebayeng-Dikgale RWS, Badimong RWS, Segwasi RWS, Boyne RWS, Mankweng RWS, Mankweng RWS DRAFT JUNE 2014 Prepared for: Department of Water Affairs Directorate: National Water Resource Planning Private Bag X313 PRETORIA, 0001 RECONCILIATION STRATEGY FOR POLOKWANE RWS EXECUTIVE SUMMARY Location and Background Information The Polokwane city cluster is strategically located in the centre of the Polokwane Local Municipality (PLM). The cluster is serviced with groundwater, surface water from local resources and surface water transferred from outside the municipality area through three water transfer namely the Ebenezer, Dap Naudé and Olifants-Sand transfer mains. The cluster includes the following regional water supply schemes: Olifants Sands RWS: Bloedrivier, Greenside, Kgohlwane, Mabotsa, Makgove, Mokgokong, Pietersburg, Seshego, Toska Mashinini and Thokgwaneng Mothapo RWS: Cottage, Ga-Mothiba, Makotopong 1, Makotopong 2, Nobody-Mothapo, Nobody-Mothiba and Ntshichane. Sebayeng-Dikgale RWS: Dibibe, Dikgale 1, Dikgale 2, Dikgale 3, Ga-Kololo, Ga-Maphoto, Ga-Mawashasha, Ga-Mokgopo, Ga-Moswedi, Ga-Motholo, Kgokong, Kgwareng, Lenyenye, Madiga, Makengkeng, Makgoba 1, Makgoba 2, Makgwareng, Mamotintane, Mantheding, Masekho, Masekoleng, Masekwatse, Maelaphaleng, Mehlakong, Mnashemong, Moduwane, Mphalong, Sebayeng A, Sebayeng B, Sentserere, Toronto Zondo. Badimong RWS: Badimong, Bergvley, Ga-Kole, Ga-Mahlantlhe, Ga-Mailula, Ga-Makgoba, Ga-Mamphaka, Ga-Moropo, Ga-Silwane, Katzenstern, Kgatla, Kgwara, Komaneg, Lebowa, Leswane, Masealama, Mashongolile, Matshela-Pata, Melkboom, Mongwaneng, Moshate, Thabakgone, Thema, Thune and Tsware Segwasi RWS: Ga-Rakopi, Jack, Mohlakeng and Segwasi Boyne RWS: Boyne, Magokubung, Makgeng, Makgopeng, Mankgaile, Mountain View, Subiaco, Viking and Zion City Moria Mankweng RWS: Ga-Magowa, Ga-Makanye, Ga-Ramogale, Ga-Thoka, Makgwareng, Mankweng A, Mankweng B, Mankweng C, Mankweng D, Moshate and Phomolong Laaste Hoop RWS: Laaste Hoop Ward 7, Laaste Hoop Ward 7A, Maboi, Manthorwane, Mogole, Quayle and Tsatsaneng The water sources for each of the above RWS can be summarised as follows: Mothapo RWS is suppied with water from both the surface water (Ebenezer Dam) and groundwater resources. The Sebayeng-Dikgale RWS is supplied with water from the groundwater resources. The Sebayeng-Dikgale RWS is not linked to the Ebenezer pipe main, however linking seems imminent particularly the villages closest to the Ebenezer pipemain. Badimong RWS is served with a bulk supply and pipe mains branching at two points from the Ebenezer main at Sophie Mamabolo and Ga-Silwane. Segwasi RWS is supplied via a bulk supply system and pipe main branching from the Ebenezer pipeline and the groundwater installation currently serves as standby source. G:\Dimakatso\from Colin\Northern & Central Region All Town Strategies\Northern Region\Northern Region Strategies-Phase 2\Limpopo\Polokwane Cluster - 2014 Update v5.docx May 2011 i RECONCILIATION STRATEGY FOR POLOKWANE RWS Boyne RWS is served via separate abstractions from the Ebenezer pipeline to supply the villages located at the northern part of the cluster, while the villages located at the southern part of the cluster are supplied from groundwater resources. Mankweng RWS is serviced with five connections from the Ebenezer pipeline Laaste Hoop RWS is essentially a rural area presently served by a long bulk supply main from Ebenezer Dam. It lies in an area where low groundwater lithology occurs. There is no surface water resources located within the study area like major dams or rivers. Demographics, Water Requirements and Availability The population of the Polokwane Cluster (was taken from the 2011 census (Statistics South Africa) as 489 160. The high growth scenario offers a picture of positive growth with the population increasing to 626 034 by 2035, whereas the population increases to 582 280 people by 2035 for the low growth scenario. The Polokwane Cluster is supplied with local groundwater resources and surface water transferred from outside the municipality area from the Ebenezer Dam, Dap Naudé Dam and Olifantspoort weir at the Olifants River (supported by Flag Boshielo Dam). The present water requirements of the Polokwane Cluster are expected to increase from the current 33.670 million m3/a (92.184 Ml/d, 188 l/c/d) to 46.349 million m3/a (126.897 Ml/d, 203 l/c/d) by 2035 according to the high growth scenarios. The water balance with augmentation for the Polokwane Cluster are presented in Figure 1. The water balance with augmentation for the Polokwane Cluster are presented in Table 1 and illustrated graphically in Figure 1. From the results it can be seen that with the recommended support from Dap Naudé and Ebenezer Dam and the additional groundwater development (2.854 million m3/a) included, the projected water requirements still exceed the available resources throughout the projection period, even with the assumed successful implementation of WC/WDM interventions (3.266 million m3/a savings). Additional support from the Olifantspoort Weir (above the current 7 million m3/a) is required to ensure sufficient water resources availability (additional support of 9.048 million m3/a required by 2035). Groundwater augmentation must be prioritised as an augmentation option and is important that feasibility is undertaken as a matter of urgency to investigate and confirm the additional groundwater resources that could potentially be developed to meet the water requirements and that the groundwater resources are developed. Only the additional water resources required once the maximum groundwater development has been implemented and the targeted savings have been achieved through WC/WDM measures should be sourced from the Olifantspoort Weir. G:\Dimakatso\from Colin\Northern & Central Region All Town Strategies\Northern Region\Northern Region Strategies-Phase 2\Limpopo\Polokwane Cluster - 2014 Update v5.docx May 2011 ii RECONCILIATION STRATEGY FOR POLOKWANE RWS Table1: Future status of the Polokwane Cluster with reconciliation measures (million m3/a) Description Source 2011 2015 2020 2025 2030 2035 Ebenezer 16.200 16.200 16.200 16.200 16.200 16.200 Dap Naudé 4.000 4.000 4.000 4.000 4.000 4.000 Available supply Olifants/Sand 7.000 7.000 7.000 7.000 7.000 7.000 Groundwater 3.981 3.981 3.981 3.981 3.981 3.981 Groundwater 0.000 0.000 2.854 2.854 2.854 2.854 Augmentation Olifants/Sand 0.000 5.641 2.327 4.715 6.836 9.048 Additional Support Total Available 31.181 36.822 36.362 38.750 40.871 43.083 Water Water Low Growth 33.670 36.822 38.831 40.404 41.679 42.986 Requirements (no reconciliation options) High Growth 33.670 36.822 39.628 42.016 44.137 46.349 WC/WDM Low Growth 0.000 0.000 3.266 3.266 3.266 3.266 measures (Savings) High Growth 0.000 0.000 3.266 3.266 3.266 3.266 Low Growth -2.489 0.000 0.797 1.612 2.457 3.363 Surplus/ Shortfall High Growth -2.489 0.000 0.000 0.000 0.000 0.000 G:\Dimakatso\from Colin\Northern & Central Region All Town Strategies\Northern Region\Northern Region Strategies-Phase 2\Limpopo\Polokwane Cluster - 2014 Update v5.docx May 2011 iii RECONCILIATION STRATEGY FOR POLOKWANE RWS Figure 1: Water balance of the Polokwane Clustur with Augmentation options included Conclusions and Recommendations The following can be concluded from the assessment of the water supply and water requirements of the area supplied from the Rosendal Town Area Water Supply Scheme: The current water use of the Polokwane Cluster is already exceeding the currently allocated surface water resources and available groundwater resources. The current groundwater water use volume needs to be confirmed as not all the water extracted from the boreholes are metered. As things stand now the water requirements for the Polokwane Cluster are higher than the benchmark projections and need to be reduced closer to benchmark levels. A preliminary analysis to assess the potential for loss reduction through the implementation of WC/WDM indicates that there is scope to reduce the total demand by improving non-revenue water and water losses. It is therefore important that the WSA should develop and implement WC/WDM measures, in order to reduce losses and use the available water resources optimally and reduce the future deficit. A detailed WC/WDM analysis needs to be conducted to establish the potential savings that could be achieved through the implementation of WC/WDM measures. These recommended measures should be implemented to reduce losses and improve efficiency of water use. Installation of bulk water meters at the production boreholes, the water treatment works and supply zones are a priority. G:\Dimakatso\from Colin\Northern & Central Region All Town Strategies\Northern Region\Northern Region Strategies-Phase 2\Limpopo\Polokwane Cluster - 2014 Update v5.docx May 2011 iv RECONCILIATION STRATEGY FOR POLOKWANE RWS The registration of boreholes, metering of abstraction and monitoring of the regional aquifer for sustainability must also be undertaken. A feasibility study should be undertaken to investigate and confirm the additional groundwater resources that could potentially be developed to meet the water requirements as a matter of urgency. The level of utilisation, status and scientific evaluation of the existing boreholes should be verified for each of the RWS areas. Potential impacts on surface flows and groundwater levels, including the artificial recharge of the Sand River well fields below the Polokwane and Seshego WWTW’s and Rouriver wellfields below the Mankweng WWTW (between Sebayeng and Makotopong) over the long term should also be taken into consideration. Only the additional water resources required once the maximum groundwater development has been implemented and the targeted savings have been achieved through WC/WDM measures should be sourced from the Olifantspoort Weir. The potential of abstaining additional support from the Olifantspoort Weir in the Olifants River System and the infrastructure requirements need to be assessed.