Large-Scale Mapping of Hard-Rock Aquifer Properties Applied to Burkina Faso |
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| Authors: | Nathalie Courtois Patrick Lachassagne Robert Wyns Raymonde Blanchin Francis D Bougaïré Sylvain Somé Aïssata Tapsoba |
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| Institution: | 1. GeoInformation Division, Modelling and Applications Unit, Brgm, Avenue Claude Guillemin, 45060 Orleans Cedex 02, France;2. Mineral Resources Division, Brgm, Avenue Claude Guillemin, 45060 Orleans Cedex 02, France;3. Directorate General for Water Resources, Ministry of Agriculture, Hydraulics, and Fisheries, 01 BP4167, Ouagadougou 01, Burkina Faso;4. Office of Mines and Geology of Burkina Faso (Bumigeb), 01 BP601, Ouagadougou 01, Burkina Faso |
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| Abstract: | A country-scale (1:1,000,000) methodology has been developed for hydrogeologic mapping of hard-rock aquifers (granitic and metamorphic rocks) of the type that underlie a large part of the African continent. The method is based on quantifying the “useful thickness” and hydrodynamic properties of such aquifers and uses a recent conceptual model developed for this hydrogeologic context. This model links hydrodynamic parameters (transmissivity, storativity) to lithology and the geometry of the various layers constituting a weathering profile. The country-scale hydrogeological mapping was implemented in Burkina Faso, where a recent 1:1,000,000-scale digital geological map and a database of some 16,000 water wells were used to evaluate the methodology. |
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