With this graduate work, the water supply network for the town of Lovran, which is located on the slopes of Učka, will be worked out with constantly growing tourism. This calculation was carried out using the WaterCAD V8i program and the Urbano Hydra program. The hydraulic load located in this area consisted of consumers such as two industries (car wash, bakery), two hotels (Park, Excelsior), a camp and ultimately the population together with tourists included in private accommodation. When dimensioning, all the consumer's needs for water, as well as permitted speeds and working pressures, are met. In addition to consumers, the fire load for fires within the population zone and the industrial zone was also calculated. The system was analyzed through two models of water inflow into the water tower. The models of water inflow to the water tower are the gravity inflow model and water inflow with the help of pumping. The capacity of the water tower is obtained by summing up the operational, fire and safety reserves. The pipeline was laid along roads. Cast iron pipes were chosen, but analysis was also carried out to change the state of affairs by taking PVC pipes. It was also analyzed how the state of the system is affected by the occurrence of fires, regardless of whether it was one, two or even three fires. WaterCAD was used to calculate changes in the flow and speed of water in the pipes, as well as the obtained working pressures. The Urbano Hydra program was used for the validation of the obtained solutions in comparison with the WaterCAD V8i program and for drawing longitudinal profiles, stakes, the scheme of nodes with phase elements and the characteristic section of the trench.