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A digital twin to anticipate flood overflows 48 hours in advance

A digital twin to anticipate flood overflows 48 hours in advance

PGTEC, a hydrological digital twin presented by VRAIN, the IIAMA and ValgrAI, integrates official hydrometeorological data into a common space to simulate…

Valencia now has a platform capable of simulating how a river basin will evolve when it rains and of anticipating possible flooding over the following 48 hours, a margin for emergency services to identify the areas at greatest risk and plan their response before water overtops the channels. --- The context --- The flooding of October 29, 2024 demonstrated the need for tools capable of anticipating floods and warning of overflow risk with enough time to protect the population. That day made clear that reacting once water advances is not enough: prevention needs shared data and hours of advantage. --- The facts --- The system presented is called PGTEC, a platform for the early prevention management of climate emergencies. It is a hydrological digital twin that, using real-time rainfall data, simulates the evolution of a basin and forecasts possible flooding over the following 48 hours, integrating hydrometeorological data from multiple official bodies into a common, interoperable space. Its most notable application makes it possible to anticipate rises in ravines and to simulate on a map how water would advance across the territory. The platform already incorporates a digital twin of the l'Horta Sud basins and of the Carraixet ravine, recreated in the Poyo ravine basin with the rainfall records from the day of the flood. PGTEC combines two complementary tools. The TETIS hydrological model uses recorded rainfall and forecasts from multiple sources to estimate how much water will flow through each stretch and when it may overflow. It marks the most compromised stretches with colors, follows the forecast evolution over 48 hours and runs each simulation in approximately one or two minutes; it can also shift a storm, increase its intensity or reproduce historical episodes. HIDRIS, the second tool, reproduces how water would spread across the terrain if the channel overflowed, with what depth and speed it would advance and which buildings or critical infrastructure would be affected. The team also simulated that storm transferred to the Carraixet ravine, to see how it would have affected the neighboring towns. PGTEC also incorporates WATER4CAST, an algorithm that improves weather forecasts and helps anticipate droughts, water needs and conditions favorable to forest fires. It was presented by VRAIN and the IIAMA, of the Universitat Politècnica de Valencia, together with ValgrAI, and is financed by the Ministry for Digital Transformation and the Civil Service, within the framework of the Directorate General for Data and the Data Economy Reference Center. --- The positions --- VRAIN researcher Sergio Martí stressed that the data space applies a common semantics, a single language to describe the data, so that a rainfall figure means the same thing wherever it comes from. Each organization retains sovereignty over its data and decides access, purpose and conditions through a prior usage contract. Félix Francés, of the IIAMA, proposed the two opposite examples of the project: rises in water levels, which require decisions within hours with almost real-time data, and droughts, which depend on long historical series. Vicent Botti, director of VRAIN and director general of ValgrAI, stated that before, each body was consulted separately, with its own formats, and that PGTEC brings them together in a single environment. --- What remains unknown --- It remains to be seen how the platform will be integrated into the daily operations of the emergency services and how quickly its simulations will translate into decisions on the ground. The timetable for extending it to new basins, beyond the twins already incorporated, is also unknown. --- Unanswered questions --- When will emergency services begin working with PGTEC during real episodes of intense rainfall? Which basins and ravines will be incorporated after l'Horta Sud and the Carraixet? How will the common reading of the situation reach the municipalities with the fewest technical resources of their own? --- EPM analysis --- The value of PGTEC lies not only in computing power, but in the idea of sharing: public data that stop being locked away in silos and become a common reading at the service of civil protection. Anticipating a rise 48 hours ahead makes it possible to warn the population, protect critical infrastructure and prepare resources in time. 📌 EPM Take: In EPM's view, the lesson of October 29, 2024 is that prevention is built before the storm, with shared public data and tools that any emergency service can consult in a single environment. PGTEC is right to gather information that was scattered and to preserve each organization's sovereignty over its data, because sharing should not mean losing control. Its success will be measured in the next floods: if the simulations arrive in time and translate into clear decisions, Valencia will have gained a culture of anticipation. That shared prevention, grounded in public data, is the standard by which it should be judged.
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