The master thesis presents a conceptual solution of the optimization of a part of the water supply system of the Donja Drenova using pumping stations. In the first part of the paper, the assigned area was analyzed, important features were mentioned, and with the collected information, the relevant quantities for different consumer were defined. After the calculation of the relevant quantities, I moved on to the creation of a hydraulic calculation, where the flows, pressures in the nodes, velocities and losses in the pipes were analyzed, and the most optimal variant was created. Three variants are developed which differ in terms of the disconnection and altitude of the position of the source and pump stations, and in the pressure pipelines and the different periods of water abstraction. The water supply system is performed as a gravitational – thrust (combined) system. The supply to the water chamber of the water tower is carried out by a repressed system, while the distribution of the branch network is gravity. All of the above analyses were made out of the Excel, and then, after converting the CAD elements within the Urbano Hydra 11 computer program and used the longitudinal sections, cross – section of the trench, the assembly plan of the junction and the stake plans were drawn using it. At the end of the work, the most optimal variant was selected and a final opinion was given.