Water supply system in Kranj is serving with water more than 35,000 people. The system has lots of water losses, so they want to make some changes in water supply system Kranj. Region is divided into individual zones. The zones are divided according to the location of measurement of flow and pressure. Each zone must be separately calibrated. This will help to determine where in the network water losses occur and to what extent. You can also find out, if there are rapid changes of pressure. Sudden pressure changes can cause hydraulic shock, damage to water pipes. Therefore, it is necessary to make a hydraulic model. The model is made of a lot of information about the elements of the distribution network. When you have collected all the necessary data, the model can be simulated. To better match the measurement results with the results of the model, calibration must be done. Once the model is constructed and calibrated, it can simulate different flows at different times throughout the day. In this way we can get the results of flow, pressure and other quantities in the water supply system at the different uses throughout the day. In this thesis I have built a hydraulic model for the area Primskovo and Planina in the Epanet 2.0. As the boundary conditions I considure the pressure at the boundary areas and calibrated system depending on the flow. When I calibrated the system, I ran simulations for different water demands
