The proposed act concerns the construction of rainwater drainage ducts and the secondary sewerage ducts required due to conditions in Agia Matrona and Yiannis Ritsos streets within the urban fabric of the Karlovasi Prefecture in order to solve the problem of the occurrence of intense flooding phenomena in the above areas, to facilitate the free drainage of rainwater to the natural recipients of sea streams and to separate the wastewater from rainwater in the existing universal sewerage network of the neighbourhoods of the Agia Matrona area.