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1 Gaye, C. B.; Tindimugaya, C. 2019. Review: challenges and opportunities for sustainable groundwater management in Africa. Hydrogeology Journal, 27(3):1099-1110. [doi: https://doi.org/10.1007/s10040-018-1892-1]
Groundwater management ; Sustainable development ; Groundwater assessment ; Groundwater pollution ; Monitoring ; Climate change ; Precipitation ; Water resources ; International waters ; Aquifers ; Water use ; Water institutions ; Stakeholders ; Information management ; Capacity building / Africa South of Sahara
(Location: IWMI HQ Call no: e-copy only Record No: H049364)
https://link.springer.com/content/pdf/10.1007%2Fs10040-018-1892-1.pdf
https://vlibrary.iwmi.org/pdf/H049364.pdf
https://vlibrary.iwmi.org/pdf/H049364.pdf
(1.33 MB) (1.33 MB)
Groundwater plays a fundamental yet often little appreciated role in supporting economic development and human well-being in both urban and rural environments, as well as supporting many aquatic ecosystems in Africa. Thus, groundwater has high relevance to the development and well-being of Africa, if adequately assessed and sustainably exploited. Whilst the potential for groundwater-resources development continues to be reported in the literature, a quantitative understanding of these issues remains poor. The objective of this paper is to highlight the main groundwater issues and problems in Africa and the current and expected opportunities for sustainable groundwater management. This will be done through the review of existing knowledge of groundwater resources and of ongoing and planned groundwater management programs and initiatives. Groundwater resources in Africa face increasing threat of pollution from urbanisation, industrial development, agricultural and mining activities, and from poor sanitation practices and over-exploitation due to increasing demand to meet human and agricultural needs. However, despite the existence of a number of groundwater management challenges, groundwater resources in Africa are still generally under-developed and can meet the various needs in a sustainable manner if better managed. Thus, strategies to ensure sustainable development and management of groundwater resources need to be put in place. These include establishment of groundwater monitoring systems, understanding of the groundwater–aquatic ecosystem relationships, management of transboundary aquifers, addressing climate-change impacts on groundwater, assessing the impact of increased pumping from various types of aquifers on sustainability of groundwater abstraction, and capacity building in groundwater management.
2 Faye, S. C.; Diongue, M. L.; Pouye, A.; Gaye, C. B.; Travi, Y.; Wohnlich, S.; Faye, S.; Taylor, R. G. 2019. Tracing natural groundwater recharge to the Thiaroye Aquifer of Dakar, Senegal. Hydrogeology Journal, 27(3):1067-1080. (Special issue: Groundwater in Sub-Saharan Africa) [doi: https://doi.org/10.1007/s10040-018-01923-8]
Groundwater recharge ; Aquifers ; Semiarid zones ; Urban areas ; Groundwater flow ; Groundwater table ; Monsoon climate ; Rain ; Chemical composition ; Isotopes / Senegal / Dakar / Thiaroye aquifer
(Location: IWMI HQ Call no: e-copy only Record No: H049362)
https://link.springer.com/content/pdf/10.1007%2Fs10040-018-01923-8.pdf
https://vlibrary.iwmi.org/pdf/H049362.pdf
https://vlibrary.iwmi.org/pdf/H049362.pdf
(5.43 MB) (5.43 MB)
Urban groundwater in Sub-Saharan Africa provides vital freshwater to rapidly growing cities. In the Thiaroye aquifer of Dakar (Senegal), groundwater within Quaternary unconsolidated sands provided nearly half of the city’s water supply into the 1980s. Rising nitrate concentrations traced to faecal contamination sharply curtailed groundwater withdrawals, which now contribute just 5% to Dakar’s water supply. To understand the attenuation capacity of this urban aquifer under a monsoonal semi-arid climate, stable-isotope ratios of O and H and radioactive tritium (3H), compiled over several studies, are used together with piezometric data to trace the origin of groundwater recharge and groundwater flowpaths. Shallow groundwaters derive predominantly from modern rainfall (tritium >2 TU in 85% of sampled wells). d18O and d2H values in groundwater vary by >4 and 20‰, respectively, reflecting substantial variability in evaporative enrichment prior to recharge. These signatures in groundwater regress to a value on the local meteoric water line that is depleted in heavy isotopes relative to the weighted-mean average composition of local rainfall, a bias that suggests recharge derives preferentially from isotopically depleted rainfall observed during the latter part of the monsoon (September). The distribution of tritium in groundwater is consistent with groundwater flowpaths to seasonal lakes and wetlands, defined by piezometric records. Piezometric data further confirm the diffuse nature and seasonality of rain-fed recharge. The conceptual understanding of groundwater recharge and flow provides a context to evaluate attenuation of anthropogenic recharge that is effectively diffuse and constant from the vast network of sanitation facilities that drain to this aquifer.
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