TECHNICAL | SOFT GROUND TUNNELLING
FLOOD DRAINAGE TUNNELS FOR LISBON
Major tunnelling works are underway in Lisbon, including a TBM drive, to help significantly improve drainage capacity against flash flooding impacts
Lisbon has been suffering from intense and more frequent flood events in recent years. These events not only negatively affect the tourism industry but, more importantly, cause long-lasting detrimental effects to the population of the city as well as its property and heritage. Inundation has been experienced in areas such as Baixa and Alcântara. The Lisbon Drainage Master Plan (LDMP) is intended to
minimise the recurring and increasing flooding problem while increasing infrastructure resilience in specific vulnerable areas of the Portuguese capital, including parts of the historical centre. The activities of the plan have been well underway
for some time. They cover infrastructure investment and strategic improvements to the city’s flood management capabilities, aiming to deliver the benefits most notably through large-scale underground works. By attenuating the size and timing of the peak flood
flows, the LDMP is to reduce both the frequency and magnitude of flood events in the city, and minimise potential damage, compared to the current capacities. Key is to store and divert some of the flows so as to delay and reduce the size of the peak flow rates and levels.
Above: TBM boring on the first of two flash-flood resilience tunnels in Lisbon IMAGES COURTESY OF CAMARA MUNICIPAL DE LISBOA 22 | November 2024
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