Properties of shallow thin regolith aquifers in sub-Saharan Africa: a case study from northwest Ethiopia

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Abstract

Pumping tests have been successfully conducted on shallow hand-dug wells in two areas of northwest Ethiopia. The drawdown and recovery data were analysed separately providing consistent results confirming suitability of methods. Hydraulic conductivity estimates ranged from 0.2 to 6.4 m/d (mean = 2.3 m/d, median = 1.6 m/d) in the dry season and ranged from 2.8 to 22.3 m/d (mean = 9.7 m/d, median = 6.5 m/d) in the wet season when the water-table was higher. This difference indicates the importance of excavating wells as deeply as possible to increase the likelihood of intercepting more transmissive (water-bearing) layers. Specific yield estimations have a wider range (0.00001 to 0.32) and are more uncertain though the mean of 0.09 (median of 0.08) is reasonable. Estimates of well yield average 0.5 l/s though this increases to >1 l/s in the wet season; giving opmitism that small-scale irrigation is achievable, therefore, potentially reducing the reliance on rain fed agriculture. These results from weathered basalt regolith add to the sparse available data on shallow groundwater resources in sub-Saharan Africa. Consistency of results from nearby and distant wells indicates homogeneity of shallow aquifer materials giving a high transferability of findings to other areas of Ethiopia. This knowledge of aquifer properties facilitates modelling for estimating impacts of climate variability and change, and for developing sustainable management strategies for shallow groundwater resources.
Original languageEnglish
Title of host publicationProceedings of 7th RWSN Forum
Volume1
Publication statusPublished - May 2017
Externally publishedYes
Event7th Rural Water Supply Network (RWSN) Forum: Water for everyone - Radisson Blu Abidjan Airport, Côte d'Ivoire
Duration: 29 Nov 20162 Dec 2016
Conference number: 7
https://rwsn7.net/

Conference

Conference7th Rural Water Supply Network (RWSN) Forum
Abbreviated titleRWSN
CountryCôte d'Ivoire
Period29/11/162/12/16
Internet address

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