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An Assessment of Groundwater Grab Syndrome in Langata Sub County, Nairobi City-Kenya

机译：内罗毕城市肯尼亚兰多县地下水抢占综合征评估

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Interest on the investigation of groundwater depletion threat is growing globally and Langata sub County in Nairobi, the capital city of the Republic of Kenya, is not an exception. Because of drought-induced water shortage, households in Langata do rely on borehole water to augment their intermittent municipal water supply system. Consequently, there is an upsurge of borehole developments as drought events unfold. Previous studies here have focused on impact of borehole depths and density yet little seems to have been done to compute the correlation coefficient between drought events data and historical borehole development records as an assessment for groundwater "grab" syndrome. This study used drought index computation method (SPI) alongside other statistical methods to seek the answer to the problem. Using 57 years of monthly rainfall data and 26 years of borehole development data, the study established that, there is a positive correlation coefficient. Similarly, a trend analysis of borehole drilling and struck water level depths indicated a positive parallel rising trend on both. Further, when the borehole distribution map and struck water level contour maps were plotted, a sign of a probable well interference during pumping was detected, which however, requires a new investigation to confirm the syndrome of groundwater depletion threat. The study has contributed to the groundwater depletion research by deploying statistical research methods for risk detection. Finally, the study has proposed for a new groundwater management policy that will encourage initiation of artificial recharge schemes for the study site and beyond.
机译：对地下水耗尽威胁调查的兴趣在肯尼亚共和国首都的首都内罗毕的全球和兰纳次县，并不是一个例外。由于干旱诱导的水短缺，兰迪的家庭依靠钻孔水来增强他们间歇的市政供水系统。因此，随着干旱事件展开，钻孔发育的巨大巨大。以前的研究侧重于钻孔深度的影响，并且密度似乎很少，以计算干旱事件数据和历史钻孔发展记录之间的相关系数作为地下水“抢”综合征的评估。本研究使用干旱指数计算方法（SPI）与其他统计方法一起寻求问题的答案。使用57年的每月降雨数据和26年的钻孔开发数据，研究确定，存在正相关系数。类似地，钻孔钻孔和击中水位深度的趋势分析表明两者上的正平行上升趋势。此外，当绘制钻孔分布图和击中水位等高图时，检测到在泵送过程中可能发生的井干扰的标志，然而，需要进行新的研究以确认地下水耗尽威胁的综合症。该研究通过部署风险检测统计研究方法有助于地下水耗尽研究。最后，该研究提出了一种新的地下水管理政策，鼓励研究研究现场和超越人工补给计划。

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