Inventory of geo-hydrological phenomena in Genova municipality (NW Italy)

Figures & data

Figure 1. Geological scheme of Genoa Municipality and location maps.

Figure 2. The population trend in Genoa municipality from 1861 (data from Genoa Municipality).

Figure 3. The spatial distribution of the cultural heritages in Genoa Municipality, selected by the regional and municipal data. Municipality does not include all the hydrographical networks and catchments.

Table 1. Main flood and landslide events in Genoa Municipality in the period after the WWII (Faccini et al., 2015).

Event Date	Event	Source
19 September 1953	Flash flood (5 hs peak) in the western slope and in the middle and lower part of the Bisagno catchment with its complete overflowing. Re-activation of the large landslide dam of Prato Casarile and subsequent debris flow.	Cati (1971); Tropeano et al. (1993)
21 March 1968	A large collapse landslide in the central-western part of the city destroyed a portion of a residential building, causing 19 victims.	Peretti (1969)
8 October 1970	Regular 24 h flood with the complete overflowing of the middle and final stretch and tributaries in the Bisagno catchment. Floods in the Polcevera catchment. 44 fatalities, damage 55 million Euros equivalent, 1000 people left homeless; 50,000 people without jobs. Re-activation of the large landslide dam of Prato Casarile and subsequent debris flow.	Cati (1971); Tropeano et al. (1999)
6 October 1977	Several floods in the western part of the city and diffuse shallow landslides in the catchments.	Tropeano et al. (1999)
8 December 1977	Floods in the central/eastern area of the city. The main hospital is flooded.	Tropeano et al. (1999)
27 September 1992	Regular floods with final 2 hs peak, overflowing of the final stretch of Bisagno catchment.	Tropeano et al. (1993)
4 October 2010	Flash flood in the western part of the city in the small catchments of Chiaravagna, Marotta and Monferrato streams. Several sallow landslides in the catchments.	Faccini et al. (2015a)
4 November 2011	Flash flood in the western and final part of the catchment, overflowing of the final stretch and Fereggiano tributary. Diffuse shallow landslides in the catchment.	Faccini et al. (2016)
9 October 2014	Regular 48 flood with a 5hs peak causing overflowing of the final stretch. Diffuse shallow landslides; partial re-activation of the large landslide dam of Prato Casarile and subsequent debris flow.	Faccini, Luino, Sacchini, et al. (2015); (Faccini et al., 2018); Paliaga, Faccini, Luino, Turconi, and Bobrowsky (2018)

Figure 4. The dark blue bars show monthly average rainfall in the period 1961–2010 (data of the meteorological station Genoa – University from ARPAL, 2013); red dots show the monthly distribution of geo-hydrological events in the period 1950–2016.

Table 2. Data used for the analysis and for the drawing of the map. The DTM is the more recent available, like all the other layers.

Issue	Source	Format	Scale	Year
DTM (5 m res)	Liguria Administrative Region	Raster	1:5000	2007
Roads and buildings (Technical Regional Map)	Liguria Administrative Region	Vector - lines	1:5000	2007
Landslides and DSGSD	Italian landslides inventory (‘InventariodeiFenomeniFranosi in Italia’)	Vector- polygons	1:10,000	2017
Flood hazard areas	Directive 2007/60EU	Vector- polygons	1:10,000	2015
Historical and cultural heritage sites	Landscape Regional Territorial Plan	Vector- polygons Vector-points	1:25,000	1991–2017
Bathymetry	Liguria Administrative Region	Vector- polygons	1:25,000	1992
River catchments	Liguria Administrative Region	Vector - polygons	1:10,000	2002
Hydrographical network	Liguria Administrative Region	Vector - lines	1:10,000	2001
Hydrographical network	Genova Municipality	Vector – lines Vector- polygons	1:5000	2015
Municipality districts	Genova Municipality	Vector- polygons	1:5000	2015
Historical and cultural sites	Genova Municipality	Vector- points Vector-polygons	1:5000	2015
UNESCO zone	Genova Municipality	Vector- polygons	1:5000	2016

Table 3. Cultural heritages in Genoa Municipality.

Cultural heritages	No.
Historical aqueduct	20
Cultural heritage sites	62
Fortification	14
High public interest areas	19

Figure 5. Damage after 2014 flood in the Bisagno catchment; A, B near the train station; C, D solid transport and riverbank collapse along Geirato stream, a Bisagno river tributary (refer to the scheme in the Main Map).

Figure 6. Landslides in the Municipality: A, road interruption in the upper Urban unit 12; B the actual status of the via Digione collapse landslide (u.u. 27); Clandslide affecting a residential building and a road; D of a landslide strongly affected apartment in 2014 (district 15).

Cati, L. (1971). L’evento alluvionale del 7–8 ottobre 1970 sui bacini dei torrenti Leiro, Polcevera e Bisagno [The 7-8 October 1970 flood event in the Leiro, Polcevera and Bisagno catchments]. Annali Idrologici, parte 2. Roma: Istituto Poligrafico dello Stato.

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Faccini, F., Luino, F., Sacchini, A., & Turconi, L. (2015a). The 4th October 2010 flash flood event in Genoa SestriPonente (liguria, Italy). Disaster Advanced, 8(8), 1–14.

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Faccini, F., Paliaga, G., Piana, P., Sacchini, A., & Watkins, C. (2016). The bisagno stream catchment (genoa, Italy) and its major floods (1822, 1970 and 2014): geomorphic and land use variations in the last three centuries. Geomorphology, 273, 14–27. doi:10.1016/j.geomorph.2016.07.037

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Faccini, F., Luino, F., Sacchini, A., Turconi, L., & De Graff, J. V. (2015). Geo-hydrological hazard and urban development in the Mediterranean area: An example from Genoa city (Italy). Natural Hazards and Earth System Sciences, 15, 2451–2492. doi:10.5194/nhess-15-2631-2015

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Faccini, F., Luino, F., Paliaga, G., Sacchini, A., Turconi, L., & de Jong, C. (2018). Role of rainfall intensity and urban sprawl in the 2014 flash flood in Genoa City, Bisagno catchment (Liguria, Italy). Applied Geography. doi:10.1016/j.apgeog.2018.07.022

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Paliaga, G., Faccini, F., Luino, F., Turconi, L., & Bobrowsky, P. (2018). Geomorphic processes and risk related to a large landslide dam in a highly urbanized Mediterranean catchment (Genova, Italy). Geomorphology. doi: 10.1016/j.geomorph.2018.10.0203

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