The paper deals with the development of a project solution for sanitary wastewater drainage of the settlement Premantura in the municipality of Medulin in accordance with the existing planning documentation, with the aim of connecting the rest of the settlement Premantura to the separete sewer system with increasing quality of life and environmental protection. First, the relief, climatic and geological features of the subject location are analysed, the current state of the system is described and the method of making a new system is planned. It is followed by the technical description of all the elements that are in the system is written where their characteristics and ways of installing are described. For the needs of creating a situational display and hydraulic calculation, the Urbano Canalis 10 software package from Studio Ars was used. Then, the hydraulic and static calculation of the collector and the calculation of the pumping station are described and performed. In addition to the system calculations, an approximate system cost estimate has been prepared. Finally, the draft documentation is attached in the form of a situational plans, a longitudinal profile of the main drainage collectors and a view of the details of the manholes and pumping station.