Construction of Wells: The objective of the course is to arrive at theoretical and practical approaches to well construction. We will describe the constitution, the method of equipment and the determination of the capacity of a work. For this we will see: - The different types of structures (wells, boreholes); - Equipment techniques; - Types of pumping tests. Water drilling: the objective is to arrive at theoretical and practical approaches to drilling techniques. In general, the hydrogeologist establishes the relationship between geology and groundwater. While advocating the methods of catchment, he therefore tries to locate the -habitat¿ of the water in the various geological formations.