The aim of the project is to study two Roman Water Systems which are using the same water source - Jadro spring. First one is Water System of Salona, capital of Roman province Dalmatia, from the 1st century, and the second one is of Diocletians Palace in Split from 4th century. The study will consist of analysis and reconstruction of two, by its purpose, different Water System, one of typical urban character and another very specific of Emperor Palace. Unlike the Water System of the Palace, which is partly preserved (aqueduct is in function) and therefore more studied, the Water System of Salona is mostly unknown. They will be studied separately using the same methodology. All parts of Water Supply system will be studied: water intake on Jadro spring, route and elements of the aqueduct (channel, bridges and tunnels), water distribution tanks, lead pipe network and water appliances together with water quantity and quality issues. The study of sewage will consider wastewater and storm water drainage, as well as the protection from external surface water and groundwater. Besides those, methods, materials and techniques used by Roman engineers to establish efficient urban Water System indispensable for the life and health of the citizens will be analyzed and compared with modern system. The study will be based on collecting all data regarding explored elements of the Water System and on new archaeological excavations financed by this project. Existing topographic and architectonic surveys will be summarized and supplemented by new ones which will enable reconstruction of the whole system and elements. The project team is multidisciplinary and gathers civil engineers, architects and archaeologist. Apart from new knowledge about the planning, building and maintaining Roman Water Systems this project will give necessary data to protect elements of the system form devastation, to make a proper presentation and even to put some elements is use.