This paper describes the conceptual design of the water supply system for the settlement of Banjole which is located in southern part of peninsula Istria, using the WaterCAD V8i program owned by Bentley Systems. Area of Banjole have a population less then 1000 inhabitants, and almost half of million nights per year spent in tourist accommodations with growing tendency. Designed water supply system is made of combined pumping and gravity flow distribution systems. New part contains pipes, pumping station and water reservoir, and the old part is made of pipes that satisfied required criteria. Altogether, water supply system is providing drinking water and protection in the case of fire breaking out for 54 households, three hotel type objects and five camps. Detail hydraulic anaylsis is made for the purpose of chosing optimal location for the water reservoir and route of pipeline. For the same purpose are made contours maps and 3D models of terrain. Every decision made in process of chosing characteristics of hydraulic elements of system is explained from stand point of engineering approach. For every consumer in a system is defined daily, weekly and monthly consumption of drinking water. In the WaterCAD V8i program charts are made that show oscillations of water masses in the water reservoir, quality of water and water flow, velocity and headloss for representative and significant pipeline sections. Except analysis of hydraulic parameters in water reservoir and pipes, work of pumping station is analysed and tables are provided for duration of emptying and filling of reservoir for every day in a year.