Typology As of January 1, 2024, Castelsarrasin is categorized as a small town, according to the new seven-level communal density grid defined by INSEE in 2022. It belongs to the urban unit of Castelsarrasin, an intra-departmental agglomeration grouping together two communes, of which it is the
city center. Furthermore, the commune is part of the Castelsarrasin attraction area, of which it is the central commune. This area, which includes communes, is categorized in areas with fewer than 50,000 inhabitants.
Land use The
land use of the commune, as shown in the
European
biophysical land use database Corine Land Cover (CLC), is marked by the importance of agricultural territories (80.3% in 2018), a decrease compared to 1990 (86.2%). The detailed breakdown in 2018 is as follows:
arable land (50.1%), heterogeneous agricultural areas (18.8%), urbanized areas (10.4%), permanent crops (9.8%), industrial or commercial areas and communication networks (3.3%), inland waters (2.9%), forests (2.8%), meadows (1.6%), environments with shrub and/or herbaceous vegetation (0.3%). The evolution of the land use of the commune and its infrastructures can be observed on the different cartographic representations of the territory: the
Cassini map (18th century), the general staff map (1820–1866) and the
IGN maps or aerial photos for the current period (1950 to today).
Roads The main roads serving the city are the
A62 motorway via exit 9 "Castelsarrasin", and the former national road 113, which became departmental road 813 following the downgrading of national roads in 2005. Most existing secondary roads converge on the city center. A circular boulevard runs around the city center. The unique feature of this boulevard is that it is almost entirely one-way. This can sometimes complicate travel between certain areas of the city.
Public transport The city is crossed by the
Bordeaux–Sète railway. Trains use it and serve
Castelsarrasin station. The
Bordeaux-Toulouse high-speed line will cross the southern end of Castelsarrasin, through the residential neighborhoods of Bénis and Saint Martin Belcassé. A
regional bus network line connects
Montauban to Castelsarrasin with 37 daily round trips. The town is served by the Castelsarrasin public transport network,
La Tulipe, which has two lines, including a circular line divided into two (even and odd directions).
Canal of Garonne The Canal de Garonne, which is part of the
Canal latéral à la Garonne, crosses the city from north to south. It is an essential element of tourism, due to the large number of boaters who use it, the greenway used by walkers of all kinds, and the attraction of the Port Jacques-Yves-Cousteau.
Air transport Castelsarrasin airport is located in the northeastern part of the city, in the Gandalou district. Its primary purpose is aerial leisure.
Major risks The territory of the commune of Castelsarrasin is vulnerable to various natural hazards: meteorological (
storms,
thunderstorms,
snow,
extreme cold,
heatwave or
drought),
floods, ground movements and
earthquakes (very low seismicity). It is also exposed to three technological risks, the transport of dangerous materials and industrial risk and nuclear risk. A site published by the
BRGM allows you to simply and quickly assess the risks of a property located either by its address or by the number of its plot.
Natural risks The commune is part of the Montauban-Moissac high flood risk area (TRI), which includes 15 communes at risk of the
Tarn overflowing, one of the 18 TRIs that were closed at the end of 2012 in the Adour-Garonne basin. The historic flood of March 1930 caused considerable damage. The disaster left 210 dead and nearly 10,000 homeless. 120 deaths were recorded in the town of Moissac alone after the
dikes broke and 2,769 houses were destroyed in Tarn-et-Garonne. Floodplain maps have been established for three scenarios: frequent (flood with a
return time of 10 to 30 years), medium (return time of 100 to 300 years), and extreme (return time of around 1,000 years, which would render any protection system ineffective). The commune has been declared a natural disaster site due to damage caused by floods and
mudslides in 1988, 1994, 1996, 1999, 2000, 2005, 2006, 2018, and 2022. Castelsarrasin is exposed to the risk of forest fires. However, as the Tarn-et-Garonne department generally presents a very localized medium to low hazard level, no Departmental Plan for the Protection of Forests Against Forest Fire Risk (PFCIF) has been developed. Clearing brush around houses is one of the best protections for individuals against fire. The ground movements likely to occur in the commune are differential settlements. The shrinkage-swelling of clay soils is likely to cause significant damage to buildings in the event of alternating periods of
drought and rain. The entire commune is at medium or high risk (92% at the departmental level and 48.5% at the national level). Of the 4,723 buildings counted in the commune in 2019, 4,723 are at medium or high risk, i.e. 100%, compared to 96% at the departmental level and 54% at the national level. A map of the exposure of the national territory to the shrinkage-swelling of clay soils is available on the
BRGM website. Furthermore, in order to better understand the risk of land subsidence, the national inventory of
underground cavities makes it possible to locate those located in the commune.
Technological risks The commune is exposed to industrial risk due to the presence on its territory of a company subject to the
European SEVESO directive. The risk of transporting hazardous materials within the commune is linked to its crossing by major road or rail infrastructure or the presence of a
hydrocarbon transport pipeline. An accident occurring on such infrastructure is likely to have serious effects on property, people, or the environment, depending on the nature of the material transported. Urban planning provisions may be recommended accordingly. In the event of a serious accident, certain nuclear facilities are likely to release radioactive iodine into the atmosphere. As the commune is located within the 20 km safety perimeter around the
Golfech Nuclear Power Plant, it is exposed to nuclear risk. In the event of a nuclear accident, an alert is issued by various media (siren, text messages, radio, vehicles). As soon as the alert is issued, people living within the 2 km perimeter seek shelter. People living within a 20 km perimeter may be required, on the orders of the prefect, to evacuate and ingest iodine tablets. ==Etymology==