Summary:
Heavy rains have caused significant flooding in Lisbon, affecting low-lying areas.
Urbanization has compromised natural drainage, increasing flood risks.
Construction continues in vulnerable areas, raising concerns about future impacts.
The Lisbon General Drainage Plan aims to improve water management with new tunnels.
Experts emphasize the need for better urban planning and regulations.
Heavy Rainfall and Flood Risks in Lisbon
When intense and persistent rain falls, water must go somewhere. It rushes downstream, seeking paths of least resistance. In Lisbon, low-lying areas become particularly vulnerable, especially along the riverfront. Recent heavy rainfall events have caused chaos in the city, flooding streets, homes, and disrupting public transport.
Alcântara and Algés are among the worst affected areas, alongside other neighborhoods such as Baixa, Martim Moniz, and Benfica. These areas face significant risks due to urbanization and the heavy impermeabilization of land, which has compromised the natural drainage capacity.
Urbanization Compromising Natural Drainage
Urban development, particularly in flood-prone river basins, has led to faster runoff and reduced infiltration, increasing the likelihood of flooding during heavy rains. José Luís Zêzere, a geography expert, criticizes the continuous construction in vulnerable flood zones, warning that current infrastructure cannot handle the increased water flow.
Ongoing Construction Despite Risks
Despite the dangers, significant construction projects continue in areas like Alcântara and Algés, including new hospitals and residential buildings. For example, the CUF Tejo Hospital, opened in 2020, is situated in a flood-prone area, raising concerns about future flooding impacts on essential services.
Measures for Flood Prevention
To mitigate future flooding, Lisbon's drainage capacity must be enhanced. The Lisbon General Drainage Plan aims to improve water management with two major tunnels designed to alleviate pressure on local drainage systems. These tunnels will redirect rainwater from upstream areas before it reaches already burdened urban zones.
Call for Better Urban Planning
Experts advocate for stricter regulations regarding construction in flood-prone areas and the implementation of permeable surfaces in urban design to enhance rainwater infiltration. A new Municipal Master Plan (PDM) is also under consideration to address these pressing environmental challenges.
Conclusion
Lisbon's ongoing struggle with flooding highlights the urgent need for effective urban planning that prioritizes sustainability and safety in the face of climate change.
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