The historic city of Genoa is developed in the natural amphitheater bounded between the western ridge of the old Lanterna Promontory and the east ridge of Carignano hill. This historical amphitheater is characterized by several small catchments, from W to E: San Bartolomeo, San Lazzaro, San Teodoro, Lagaccio, Sant'Ugo, Carbonara, Sant'Anna and Torbido. These watercourses, modified over time in channels, flow culverted under the streets of different neighbourhoods: the name of alleys are often referred to their presences. All the brooks of historical centre flow fan-shaped into the Genoese port basin and show flood discharge ranging from 22 m3/s to 82 m3/s. The hidden hydrography is the memory of the urban development during the history of the city; is possible, through walls and heterogeneous construction methods, establish that the culverts were started since the Middle Ages. The culverted streams in the historical town of Genoa are typical artificial cavities: these underground structures show historical and scientific values and could represent an issue for cultural and economic developments. However these culverts may become a preferential area of geo-hydrological hazards, due to scarce hydraulic sections, land use change in the catchments, structural feature of the culverts and the acknowledged changing in rainfall regime in the Genoa Metropolitan area: so we can recognize a risk due to vulnerable elements on the surface. A better knowledge of these culverted streams in Genoa historical city becomes basilar for hazard and risk assessments related either to land planning activities either to the recognition of this important hypogeal cultural heritage

The culverted streams in the historical amphitheatre of Genoa city (Italy): flood risk or geoheritage protection?

F. Faccini;L. Perasso;
2017-01-01

Abstract

The historic city of Genoa is developed in the natural amphitheater bounded between the western ridge of the old Lanterna Promontory and the east ridge of Carignano hill. This historical amphitheater is characterized by several small catchments, from W to E: San Bartolomeo, San Lazzaro, San Teodoro, Lagaccio, Sant'Ugo, Carbonara, Sant'Anna and Torbido. These watercourses, modified over time in channels, flow culverted under the streets of different neighbourhoods: the name of alleys are often referred to their presences. All the brooks of historical centre flow fan-shaped into the Genoese port basin and show flood discharge ranging from 22 m3/s to 82 m3/s. The hidden hydrography is the memory of the urban development during the history of the city; is possible, through walls and heterogeneous construction methods, establish that the culverts were started since the Middle Ages. The culverted streams in the historical town of Genoa are typical artificial cavities: these underground structures show historical and scientific values and could represent an issue for cultural and economic developments. However these culverts may become a preferential area of geo-hydrological hazards, due to scarce hydraulic sections, land use change in the catchments, structural feature of the culverts and the acknowledged changing in rainfall regime in the Genoa Metropolitan area: so we can recognize a risk due to vulnerable elements on the surface. A better knowledge of these culverted streams in Genoa historical city becomes basilar for hazard and risk assessments related either to land planning activities either to the recognition of this important hypogeal cultural heritage
2017
978-605-9680-37-0
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/932987
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