This thesis presents the hydrodynamic and economic analysis of the water supply system with the transport of a certain amount of water to another water supply system. At the beginning of the work, the importance of the rational use of electricity and drinking water, as well as the characteristics and elements of the water supply system, are briefly explained. Then the calculation of the flow in the pipes and the pressures in the nodes of the system is presented. Pipeline and MS Excel software were used to calculate volume flow rates and pressures. The Hardy Cross method was used. The calculation was made for two cases, the case with supply and without supply to the neighboring water supply. The daily consumption of electricity is calculated for both cases, as well as the time needed to transport the required amount of water to the neighboring water supply in the low cost electricity regime for financial savings. At the end of the thesis, an economic analysis is presented, i.e. a cash flow plan and risk analysis. In the risk analysis, the risks of this project are observed, and in the cash flow plan, the total profit is calculated on the basis of which it can be concluded that the project is profitable.