This thesis presents conceptual project solutions of waste water drainage for the settlements of Stanežiče, Dvor and Medno. Considering the standards presented, current situation and discretion, a separate sewage system has been designed for the area. The thesis presents different options with direct connections to the existing collection sanitary sewer and options with a small common treatment plant. It was established that the option with the treatment plant would be impractical because of the proximity of the collection channel, the remoteness of an appropriate stack and an available Central Treatment Plant (CČN) Ljubljana. For the whole area, four different sewage systems for waste water and three systems for rainwater are presented; their total length is approximately 9.6 km. The sewage systems are dimensioned to the required filling tubes on the basis of the hydraulic calculation according to the retention method. Key parameters of the hydraulic calculation for waste water and rainwater are presented in detail. The configuration of the terrain mostly allows gravitational drainage, but for one part of Stanežiče, pumping has been predicted. The pumping station is dimensioned to allow set resistance time and it can carry out an appropriate number of daily activation depending on the chosen pump and intended inflows. Furthermore, the materials of the presented pipes, manholes and their installation are presented. Costs inventory and detailed investment analysis have been made for all of the seven systems. The thesis contains different annexes: hydraulic calculations, task lists, graphic details, situation maps and longitudinal profiles.