"Digital water" or "digital transformation in the water sector" are two of the most relevant internet search phrases in the hydraulic field in recent years. Usually, Digital Water is used to collect all the technological advances related to automation and sensing of water systems and, at the same time, all the methodological and modelling improvements that help the water manager in the analysis, simulation and prediction of complex systems and networks. Improving our understanding of urban water systems, the possibility of having a detailed modelling double of the real system opens several possible management scenarios helping to verify the impact of different strategies to improve performance, reduce uncertainty in decision making, prevent problems. The sessions will show how Digital Water is not novel but it is the product of decades of scientific and technological advancements. Providing examples both in water distribution and in urban drainage, methodological and technological aspects will be touched showing that this is a multi-disciplinary sector and that hydraulic and hydrologic knowledge is fundamental to adapt digital opportunities to the water sector.