Hydrogeological survey methodology and set wells drilled with a hand pump. Application in the region Crystal Caimbambo (Benguela, Angola)

Abstract

A methodology based in both economical aspects and the possibility of its use for local technicians for prospection and putting in service boreholes of small yield and hand manual pumps for disperse rural populations of less than 1000 inhabitants is proposed. The methodology is based in the recognition through satellite images of geomorfological areas favorable to the development of weathered formation over the rocks, its cartography, the use of simple electrical resistivity surveys of 1D, the introduction of social aspects as the proximity to the villages, and the estimation of the potential of the wells through bailer manual procedures. Those proposed approaches based in low cost techniques occupy an intermediate position between the so bad resulting blind sitting procedures that have been apply profusely in Sub- Saharan Africa and those that follow the most sophisticated and expensive techniques that often are inoperant and unviable. In this paper the results obtained from the use of this methodology in Caimbambo area (Angola) are showed so that can be used and contrasted in other regions of the world with the same characteristics.