• Project Name
  • Photo-interpretation in support of groundwater search for water supply of rural populations (Hydraulique villageoise – Village hydrogeology)
  • Country, Location(s)
  • Africa, Regions of the Sahel – Mali, Cameroon, Centrafrican Rep., Mauritania, Burkina Faso
  • Client(s)
  • Various: Lotti & Ass., Unigeo (Roma); Geolab, Arlab (Francia)
  • Aims of the Project
  • Preliminary geological investigations in support of water research for supply of single villages in areas of impervious hard rocks (crystalline, carbonates).
  • Contract Holder(s)
  • Geomap Srl
  • Staff
  • 4 geologists photointerpreters, 2 GIS experts
  • Project Activities
  • The investigation starts with a preliminary study of satellite imagery at smaller scales (1:100,000, 1:50,000) aimed at interpreting the structural setting of the area and at assessing the kinematic characteristics of the different fracture trends. A second phase is carried out at local scale and is based on the interpretation of high resolution images or aerial stereo pairs at the scale of 1:10,000, involving an area of approximately 4 km2 centred on each village.
    The fracture traces, representing preferential zones of groundwater flowing in hard rocks, are mapped. They are classified according to their length and conspicuousness and are interpreted in relation to the geological units outcropping and known in the subsurface. Furthermore, the intersections of two or more fractures are identified and classified as nodal points, being interpreted as preferential locations of groundwater occurrence.
    This type of investigation is employed as guide to the planning of geophysical surveys and to select the location for drilling wells.
    This methodology has been applied to more than thousand villages, with an average success percentage of 90%.
  • Start (month/year)
  • 1983
  • End (month/year)
  • in progress