The master thesis presents conceptual solution and the optimization of water supply system of a settlement Viškovo, which is located in county of Primorsko-goranska northwest from the city of Rijeka. The first part of this master thesis contains history, value and important features, after which relevant quantities are definied for different users of water supply system and that data is used in hydraulic calculation. At the beginning of thesis water tank design is showed for three different times of pumping, after which is calculation of pumps and their optimization which also includes three different materials of a pipe. Calculation of pumps which are place din water supply system is also included. The second part of thesis is focused on hydraulic calculation with implementation of Urbano Hydra software and WaterCAD V8i software, with detail description of basis design which is needed for water supply system designing. During the hydraulic calculation, four scenarios are made to represent different seasons and with the possibility of fire. The second model that is analyzed is a model of pumping from pump station Marinići to designed water tank and the influence of different pipe materials on the obeserved route. Hydraulic calculation, calculation of pump station, and calculation of pumps are done in Excel software, after which is hydarulic calculation done in Urbano Hydra software and WaterCAD V8i software, while the optimization is done in Urbano Hydra software. With the help of Urbano Hydra software features the longitudinal profile, cross section of a trench and assembly plan of the hubs are done, and placed at the end of thesis.