Characteristics of high-intensity groundwater abstractions from weathered crystalline bedrock aquifers in East Africa
- Maurice, L.
- Taylor, R.G.
- Tindimugaya, C.
- MacDonald, A.M.
- Johnson, P.
- Kaponda, A.
- Owor, M.
- Sanga, H.
- Bonsor, H.C.
- Darling, W.G.
- Gooddy, D.
DOIAbstract
Weathered crystalline bedrock aquifers sustain water supplies across the tropics, including East Africa. Although well yields are commonly <1 L s−1, more intensive abstraction occurs and provides vital urban and agricultural water supplies. The hydrogeological conditions that sustain such high abstraction from crystalline bedrock aquifers remain, however, poorly characterised. Five sites of intensive groundwater abstraction (multiple boreholes yielding several L s−1 or more) were investigated in Uganda and Tanzania. Analysis of aquifer properties data indicates that the sites have transmissivities of 10–1,000 m2 day−1, which is higher than generally observed in deeply weathered crystalline bedrock aquifers. At four of the five sites, weathe...
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