Groundwater resource sustainability in the Nabogo Basin of Ghana

Lutz, Alexandra; Thomas, James M.; Pohll, Greg; McKay, W.A.

doi:10.1016/j.jafrearsci.2007.06.004

Cited by 42 publications

(34 citation statements)

References 9 publications

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“…As a case study, a spreadsheet multicriterion decision analysis model was used to analyze sensitivity of stages of drought on the Niger River and impacts to priorities of decision-makers (Traore and Fontane, 2007). Results have been attained from simple models to analyze natural groundwater level variation (Thiery et al, 1993), lumped models to estimate evapotranspiration (Ardoin et al, 2001), water balance approaches to evaluate water resources (Asomaning, 1992), and water balance approaches via groundwater models such as MODFLOW (Lutz et al, 2007;2011). Most recently, remotely-sensed data have been used to fill in gaps of the historical and current observational data.…”

Section: Caveatsmentioning

confidence: 99%

“…Development of water resources, in particular groundwater, has historically been approached from a perspective that supply can be plentiful. And while hand-pumps do extract very little water with respect to the larger water balance (Lutz, 2007(Lutz, , 2009(Lutz, , 2011, increased water availability to Africa populations during the past few decades has already resulted in localized draw-downs of water tables and loss/damage to ecosystems (Edmunds 2009). Regional failure of an aquifer is unlikely, though increased demand may cause localized failure at a particular source of water.…”

Section: Path Forwardmentioning

confidence: 99%

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Climate Change and Sustainable Development of Water: Sub-Saharan Africa

Lutz¹

2011

Climate Change - Socioeconomic Effects

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Section: Caveatsmentioning

confidence: 99%

Section: Path Forwardmentioning

confidence: 99%

Climate Change and Sustainable Development of Water: Sub-Saharan Africa

Lutz¹

2011

Climate Change - Socioeconomic Effects

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“…Most of the aquifers are semi-confined to confined and groundwater quality conforms to the World Health Organization standards. However, there have been few cases of high arsenic and fluoride levels in some drilled boreholes [7,23,31]. Groundwater salinity has also been a major challenge especially in the south-eastern and north-western parts of the basin.…”

Section: Geology and Hydrogeologymentioning

confidence: 99%

“…Available literature indicates that groundwater recharge in the Voltaian ranges from 3.7-5% of annual rainfall [22,32,33] and groundwater abstraction is estimated to be less than 5% of the annual groundwater recharge [22,23].…”

Section: Geology and Hydrogeologymentioning

confidence: 99%

“…One of such formations is the Voltaian System which is believed to be late Proterozoic to early Palaeozoic in age [20] and underlain by consolidated sedimentary rocks. Recharge studies conducted using various techniques such as isotopic [19,21] and numerical models have shown that there is fresh and enough recharge to groundwater [22,23]. However, a lot of marginal or low yielding (usually far less than 100 l/min) boreholes dry up especially in the study area after 1-4 years of usage or less.…”

Section: Introductionmentioning

confidence: 98%

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Borehole Drying: A Review of the Situation in the Voltaian Hydrogeological System in Ghana

Akudago¹,

Chegbeleh²,

Nishigaki³

et al. 2009

JWARP

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Groundwater development for potable water supply for rural people in Africa especially in Ghana has increased significantly over the past decades. The area underlain by the Paleozoic sedimentary formation (Voltaian System) of the country in particular, has experienced this tremendous change. Groundwater in the study area is normally exploited through boreholes fitted mostly with hand pumps. Though the boreholes exhibit variable yields, most of them have yields greater than 13.5 l/min. Research carried out in the area suggests that there is modern and enough recharge, yet borehole drying is a problem especially those with low or marginal yields. A thorough review of the groundwater exploitation in the area, aimed at explaining the circumstances that might lead to these phenomena on the field, has been conducted. The review shows that boreholes with drill yields of usually <20 l/min, especially those drilled in the wet season, constitute the highest percentage of the dried boreholes. Other construction material such as the filter media may also influence the drying process.

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Integration of altimetric lake levels and GRACE gravimetry over Africa: Inferences for terrestrial water storage change 2003–2011

Moore

Williams

2014

Water Resources Research

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Terrestrial water storage (TWS) change for 2003-2011 is estimated over Africa from GRACE gravimetric data. The signatures from change in water of the major lakes are removed by utilizing kernel functions with lake heights recovered from retracked ENVISAT satellite altimetry. In addition, the contribution of gravimetric change due to soil moisture and biomass is removed from the total GRACE signal by utilizing the GLDAS land surface model. The residual TWS time series, namely groundwater and the surface waters in rivers, wetlands, and small lakes, are investigated for trends and the seasonal cycle using linear regression. Typically, such analyses assume that the data are temporally uncorrelated but this has been shown to lead to erroneous inferences in related studies concerning the linear rate and acceleration. In this study, we utilize autocorrelation and investigate the appropriate stochastic model. The results show the proper distribution of TWS change and identify the spatial distribution of significant rates and accelerations. The effect of surface water in the major lakes is shown to contribute significantly to the trend and seasonal variation in TWS in the lake basin. Lake Volta, a managed reservoir in Ghana, is seen to have a contribution to the linear trend that is a factor of three greater than that of Lake Victoria despite having a surface area one-eighth of that of Lake Victoria. Analysis also shows the confidence levels of the deterministic trend and acceleration identifying areas where the signatures are most likely due to a physical deterministic cause and not simply stochastic variations.

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Groundwater resource sustainability in the Nabogo Basin of Ghana

Cited by 42 publications

References 9 publications

Climate Change and Sustainable Development of Water: Sub-Saharan Africa

Climate Change and Sustainable Development of Water: Sub-Saharan Africa

Borehole Drying: A Review of the Situation in the Voltaian Hydrogeological System in Ghana

Integration of altimetric lake levels and GRACE gravimetry over Africa: Inferences for terrestrial water storage change 2003–2011

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