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Managing rural groundwater supplies

机译:管理农村地下水供应

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The south african government has a policy for rural water supply that effectively translates into supplying all rural communities with piped water. Being a relatively arid country, the implication of this is that many community water supplies are dependent on ground water and more and more ground water schemes are being developed. The paper documents the experiences of a project funded by the Government of Norway (NORAD Programme) and managed by the South African Department of Water Affairs and Forestry (DWAF). The aim of the project is to provide DWAF wilth guidelines on establishing a groundwater management system for community water supplies. The project forms part of a programme that has the overall objective of improving the sustainability of rural groundwater supplies. The project has involved piloting the establishment of groundwater monitoring systems in two separate areas with a total of 35 boreholes being monitored. Some of the schemes are being operated by community based water committees and others are operated directly by local government. Within the overall objective of improving sustainability, the motivation for monitoring ground water is a combination of operational and resource management considerations. From an operational perspective, it gives an early warning system for when equipment is not functioning correctly and allows action to be taken before the system fails. By monitoring the performance of the aquifer, one can preempt failure of the system from over abstraction and be in a position to know which ground water resources are under utilized and have the potential for further development. The nature of South African geology is such that most boreholes for community water supplies are drilled into hard rock aquifers and are relatively deep (40 to 120m). Most recommended long-term pumping rates are based on one or two day pumping tests. These tests give an indication of the potential yield but due to the nature of fractured hard rock aquifers, it is only possible to establish the actual sustainable yield by monitoring water levels and abstraction over much longer time periods.
机译:南非政府制定了农村供水政策,有效地为所有农村社区提供了自来水。作为一个相对干旱的国家,这意味着许多社区供水都依赖于地下水,并且正在制定越来越多的地下水计划。该文件记录了由挪威政府资助(NORAD计划)并由南非水务和林业部(DWAF)管理的项目的经验。该项目的目的是为建立社区供水的地下水管理系统提供DWAF指导原则。该项目是该计划的一部分,该计划的总体目标是改善农村地下水供应的可持续性。该项目涉及在两个不同的地区试行建立地下水监测系统,总共监测了35个钻孔。一些计划由社区水委员会负责,其他计划则由地方政府直接负责。在改善可持续性的总体目标范围内,监测地下水的动机是运营和资源管理方面的考虑因素。从操作的角度来看,它为设备何时无法正常运行提供了预警系统,并允许在系统出现故障之前采取措施。通过监视含水层的性能,可以防止系统因过度抽象而发生故障,并且可以知道哪些地下水资源被利用并具有进一步开发的潜力。南非的地质性质使得大多数用于社区供水的钻孔都钻入硬岩含水层中并且相对较深(40至120m)。最推荐的长期抽气速率基于一到两天的抽气测试。这些测试表明了潜在的产量,但是由于破裂的硬岩含水层的性质,只有通过在更长的时间段内监控水位和提取才能确定实际的可持续产量。

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