What criteria define the large cruise ships now banned from central Venice?

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Criteria for Banned Large Cruise Ships in Central Venice Defined

Effective August 1, large cruise ships are prohibited from sailing into central Venice, specifically in front of Saint Mark's Basilica and up the Giudecca Canal. These restrictions apply to vessels exceeding specific dimensions and environmental standards, requiring them to instead dock at the industrial port of Marghera. Smaller boats carrying a maximum of 200 passengers will still be permitted to dock within the city's historic heart.
Gross Tonnage and Length Restrictions

The ban targets ships with a gross weight surpassing 25,000 tonnes. Furthermore, vessels longer than 180 metres (590 feet) are also subject to this prohibition. These measures are in place to mitigate the physical impact of excessively large vessels on the sensitive lagoon environment and historic infrastructure.
Air Draft and Sulphur Content Limitations

In addition to size, ships with an air draft exceeding 35 metres (115 feet) are banned from entering the restricted waterways. This regulation addresses the vertical clearance needed for passage. Moreover, vessels whose emissions contain more than 0.1 per cent sulphur are also prohibited, aiming to reduce air pollution in the already fragile ecosystem.
Rationale Beyond Physical Dimensions

The concerns driving these regulations extend beyond mere dimensions. Studies, including a 2019 publication in the journal Nature, highlight how the waves and pollution generated by large cruise ships contribute to shoreline erosion, alter currents, and redistribute toxic sediments. These effects exacerbate the existing vulnerabilities of Venice, which faces challenges from sea level rise, subsidence, and historical groundwater pumping.
Alternative Docking and Future Plans

Under the new regulations, prohibited ships will be rerouted to dock at the industrial port of Marghera. This industrial area is slated for redevelopment to accommodate these vessels, with plans for temporary docks and shuttle services to transport passengers to the historic centre. Offshore approach platforms are also part of the long-term development strategy, though contracts for this phase are not anticipated until June 2023.

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What criteria define the large cruise ships now banned from central Venice?

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