GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 3.2 681 of depth and it was drilled 5 m below the aquifer level. A 10 cm diameter polyvinyl chloride casing was installed to protect the well from collapse and debris. Subsequently, a temporary pump was placed over the well to monitor the water quality and output. It was, then, finished at the surface with a stainless steel positive displacement pump and mounted on a concrete slab. Finally, a piping system was installed to bring water into a tank located at the top of an expressly built concrete water-tower (Fig. 3). The no profit organization Il Pozzo della Farfalla believes in utilizing technology that suits the economic environment and encourages the community’s self- reliance and determination, so everything was chosen for giving long-life to the project: the pump system, for example, has an average life of 20 years and all Fig. 2 - Map of Apu Kedji site in which are reported the ERT profile (red line), position of first (1) and last (48) electrode (yellow icon) and the well for water supply (cyan icon) (top). 2D resistivity model of ERT carried out in Apu Kedji with the position of the water well (bottom). Fig. 3 - Picture of the water well built in Kévé.