LOCALISATION OF AQUIFERS USING PHOTO-INTERPRETATION AND ELECTRICAL PROSPECTION IN TSIRANGOTY VILLAGE, AMBOVOMBE MUNICIPALITY, ANDROY REGION IN THE SOUTH OF MADAGASCAR

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The village of Tsirangoty is located in the extreme south of the Androy region of Madagascar. More precisely, it is 7km south of Ambovombe town. The objective of this study is to identify areas with aquifer potential in the village of Tsirangoty and its surroundings (Ambovombe-Androy) in order to improve the conditions of access to clean drinking water for its inhabitants. The approach used is a combination of photo interpretation and electrical resistivity tomography to characterize the aquifers of this site. The results showed the presence of two superimposed aquifers in the study area. The first aquifer is a superficial aquifer at a depth of less than 20m with very limited and seasonal. On the other hand, it is an aquifer with good quality water and fewfree ions, therefore less salty water. The second aquifer is located at a depth of 120m. The conductivity of this second aquifer is much higher than the standards for clean drinking water, but a desalination technique is recommended. The upcoming drilling campaign can use this result to target favourable areas. All of the water inflows from these two superimposed aquifers located on the coordinates X= 609464m and Y= 7209295m allow us to have a productive borehole.

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