22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

Permeability of the crystalline basement in Uganda - evidence from approximately 600 pumping tests and implications for solar pumping

23 Sep 2019, 17:30
15m
Conference room 2.1 ()

Conference room 2.1

Oral Topic 1 - Groundwater assessment and management Parallel

Speaker

Dr Michael Owor (Makerere University, Kampala, Uganda)

Description

Crystalline basement rocks of Precambrian age underlie nearly three quarters of Uganda, providing groundwater supplies to meet ever increasing demand from rural areas and urban growth centres. Development of groundwater sources is commonly based on several factors including physical and socio-economic considerations that have a bearing on their functionality and long term reliability. Here we present new transmissivity data from >600 boreholes across basement aquifers in Uganda calculated from previously unanalyzed pumping test data. Other data are available to help interpret the transmissivity values, including borehole lithological logs, weathering thickness, well design and depth to groundwater. Spatial and depth comparisons are made to relate aquifer permeability to lithology and weathering, and also to relate borehole yields to well design. The data provide an improved understanding of the physical permeability of weathered crystalline basement rock aquifers across Uganda, complimenting earlier studies of vertical permeability profiles in focused areas. The analysis helps inform the physical capacity of the aquifer to supply the borehole yields to meet increasing demands, and application potential for higher abstraction technologies, such as solar pumps.

Primary author

Dr Michael Owor (Makerere University, Kampala, Uganda)

Co-authors

Mr Joseph Okullo (Makerere University, Kampala, Uganda) Ms Helen Fallas (British Geological Survey, Edinburgh, UK) Prof. Alan MacDonald (British Geological Survey, Edinburgh, UK) Dr Donald John MacAllister (British Geological Survey, Edinburgh, UK)

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