The database of the Regional Solar Program of the Inter-State Committee for Drought Control in the Sahel using the SP8A7 motor pump covering a panel of 8 villages in Tchad served as a database for the construction of a model mathematical to describe the system. The model was built by highlighting that: The delivery height of a centrifugal pump is a function of the square of the motor speed. This quadratic model was therefore used to establish the dependence between the total head and the flow rate by taking the engine speed as a parameter. The similarity principles were used to assess the new settlement characteristics in Guinea. Highlighting the peculiarities of the two sites, two points of similar operating regime were established. The feasibility of transplanting between the two sites was established by satisfying the criterion of similarity.