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| Titel |
Hydrological processes and water resources management in a dryland environment III: Groundwater recharge and recession in a shallow weathered aquifer |
| VerfasserIn |
J. A. Butterworth, D. M. J. Macdonald, J. Bromley, L. P. Simmonds, C. J. Lovell, F. Mugabe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 3, no. 3 ; Nr. 3, no. 3, S.345-351 |
| Datensatznummer |
250001085
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| Publikation (Nr.) |
 copernicus.org/hess-3-345-1999.pdf |
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| Zusammenfassung |
In crystalline basement regions of Africa, shallow weathered aquifers provide
vital water resources for rural communities. To quantify evidence of the
behaviour of these shallow aquifers, groundwater levels were observed at a
network of 65 boreholes within the Romwe Catchment in southern Zimbabwe. Soil
moisture was monitored at selected sites.
Groundwater hydrographs showed considerable spatial and temporal variation.
Where the soil profile was freely draining, groundwater levels typically
responded within a few days of major rainstorms and large annual fluctuations in
the water table of up to 7 m were recorded. In areas where a thick clay layer
exists, annual fluctuations were smaller and groundwater levels rose more
gradually in response to rainfall. In cultivated areas, vertical drainage was an
important recharge mechanism. Groundwater hydrographs typically have an
exponential recession and, by the end of the dry season in the years studied,
levels were close to the base of the weathered aquifer. Variations in hydrograph
response between years illustrate the importance of rainfall amount, intensity
and distribution on groundwater recharge. |
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