ABSTRACT
Regional and local scale investigations, involving remote sensing, ground geophysics and drilling, have carried out in southeast Zimbabwe aimed at increasing the understanding of crytalline, hard-rock aquifers and improving borehole siting procedures. New products derived from satellite imagery that simplify interpretation have been developed and are described. Detailed field studies at a small number of locations suggest that, whilst photolineaments, thought to represent rock fractures for the most part, are an important element in borehole targeting, they are not by themselves a wholly reliable. The role of ground geophysical surveys in site selection is described and evaluated. A hypothesis to describe the nature and role of fracturing in this region is presented, based on the evidence of the field test undertaken. A strategy for medium-term groundwater development in low-rainfall areas underlain by crystalline basement, such as southeast Zimbabwe, is proposed. It is suggested that more effort is put into establishing a network of high-yielding wells at strategic locations to supplement individual village supplies during periods of drought. The work summarised in this report was carried out under the ODA/BGS Research & Development Programme of technical assistance to the devloping countries. A full list of reports arising from the study is provided (AU)
