The Seawater Protection Plan aims to eliminate swimming bans and reduce the pollution measured in terms of COD by 90% by 2020, through structural measures on the sewage and purification system of the City of Rimini. The numerical modelling of the sewage and purification system which started in 2014, led to further optimization of the measures that had been planned for the system of tanks that serves the southern area of Rimini and to the identification of three additional measures. By introducing a different way to handle rainwater, the optimization of the tanks Ð together with additional measures that involve the construction of the works called the Ausa backbone sewage collector, Mavone spillway and the sewage pumping system in via Santa Chiara Ð sets up synergies that significantly reduce the risk of flooding in most of the built-up area where this problem often occurs and thus expands the objectives of the plan to include the mitigation of hydrological risks. In this regard, it should be noted that in December 2019 the Dorsale Ausa project received a contribution of approximately Euro 8.5 million in public funding for hydrogeological instability under the "Italia Sicura" initiative. The Plan is currently essentially made up of its original ten measures, plus the filling of the Ausa Canal, added in 2015, and the additional measures mentioned above, for a total of 14 measures. The further optimization of the Plan, with the required design improvements and the necessary permitting, made achievement of the environmental objectives, initially planned for 2020, slip to 2024. It should be noted that by that year, the works necessary to reduce the city's hydrological risks will also be completed: the extension of the timeframe for implementing the plan as initially envisaged is closely linked to the substantial improvement of the Plan's impact on the city, which, for all the above reasons, will benefit from a significant improvement in both hydrological and environmental performance. The progress of the construction work does not lead us to expect any significant issues and the quantity goals we have set are in sight. All other measures are in progress and in the design phase.