The paper deals with the development of a project solution for sanitary wastewater drainage of the settlement of Barbat on the island of Rab in accordance with the existing planning documentation. First, the relief, climatic and geological features of the subject location are processed, the current state of the system and the differences in relation to the designed one are described, as well as the planned method of making a new system. The proposed method of stormwater drainage by alternative drainage methods is briefly described. The problem of disconnection is also explained, and the process of connecting the household to the public sewerage system is described. A technical description of all the elements present in the system is written, where their characteristics are described. For the needs of making a situational display and hydraulic calculation, the software package Urbano Canalis 10 of the company StudioArs d.o.o. 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 was prepared. Finally, the draft documentation is attached in the form of a situational view, a longitudinal profile of the main collectors and a view of the details of the shaft and the pumping station.