Permeability of the weathered bedrock aquifers in Uganda: evidence from a large pumping-test dataset and its implications for rural water supply

Permeability of the weathered bedrock aquifers in Uganda: evidence from a large pumping-test dataset and its implications for rural water supply
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乌干达风化基岩含水层的渗透性:来自大型抽水测试数据集的证据及其对农村供水的影响

DOI:
10.1007/s10040-022-02534-0
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发表时间:
2022
影响因子:
2.8
通讯作者:
Owor M
Owor M
中科院分区:
地球科学3区
文献类型:
--
作者:
Owor M

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风化结晶岩含水层位于撒哈拉以南非洲地区约40%的土地之下,为其一半的农村人口提供供水;它们在热带地区也很普遍。这些含水层的水文地质情况复杂,更好地了解对含水层渗透的控制,以及准确的钻孔位置和适当的设计,对于许多国家供水服务的长期性能和可持续性至关重要。本研究探讨了大量的新的数据集(n =655)的含水层transductivity值在乌干达来自以前未经分析的抽水试验数据。这些数据提供了重要的新见解:风化结晶岩含水层的特点是渗透率普遍较低(中值<2 m2/d);在深度<50 m的钻孔中观察到最高的透射率,这意味着在乌干达钻更深的钻孔通常不会提高供应成功率或可持续性;在乌干达的大部分地区,通过使用高产水泵技术来增加地下水抽取量将是一个挑战,并限制了它们在管道供水中的使用。这项研究突出了钻探者记录中数据的科学价值,许多国家尚未对这些数据进行分析,但这些数据可能有助于深入了解含水层的特性。
Weathered crystalline-rock aquifers underlie around 40% of sub-Saharan Africa providing water supplies for half of its rural population; they are also prevalent across the tropics. The hydrogeology of these aquifers is complex and better understanding of the controls to aquifer transmissivity, alongside accurate borehole siting and appropriate design, is pivotal to the long-term performance and sustainability of water services in many countries. This study examines a substantial new dataset (n =655) of aquifer transmissivity values across Uganda derived from previously unanalyzed pumping-test data. These data provide important new insights: weathered crystalline-rock aquifers are distinguished by pervasively low transmissivities (median <2 m2/d) in comparison to other areas in the tropics; highest transmissivities are observed in boreholes <50 m deep, implying that drilling deeper boreholes does not typically improve supply success or sustainability in Uganda; and increased groundwater abstraction through the use of higher-yielding pump technologies will prove challenging in most areas of Uganda and limit their use for piped water supplies. This study highlights the scientific value of data held in drillers’ records, which remain unanalyzed in many countries but may provide useful insight and understanding of aquifer characteristics.
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