Paris and river dating
Upstream from the basin four large storage reservoirs have been built since 1950 on the Yonne, Marne, and Aube, as well as on the Seine itself.
These relatively shallow impoundments (averaging about 25 feet in depth) cover large areas.
Joined by the Aube near Romilly, the river bears west to skirt the Île-de-France in a wide valley to Montereau, where it receives the Morvan, a northward extension of the Massif Central.
Turning northwest again, the Seine passes Melun and Corbeil as its trenched valley crosses the Île-de-France toward Paris.
In addition, half of the water used in the region around Paris, both for industry and for human consumption, and three-fourths of the water used in the region between Rouen and Le Havre, is taken from the river.
The lower course of the Seine, below Paris, is directed in a general northwesterly direction toward the sea, in conformity with the trend of the lines of structural weakness affecting the northern part of the basin.
Flowing sluggishly in sweeping loops, the Seine passes below Mantes-la-Jolie across Normandy toward its estuary in the English Channel.
The broad estuary opens rapidly and extends for 16 miles below Tancarville to Le Havre; it experiences the phenomenon of the tidal bore, which is known as the From its source to Paris, the Seine traverses concentric belts of successively younger sedimentary rocks, infilling a structural basin, the centre of which is occupied by the limestone platforms of the Île-de-France immediately surrounding Paris.
As it enters Paris, it is joined by its great tributary the Marne on the right, and, after traversing the metropolis, it receives the Oise, also on the right.
In its passage through Paris, the river has been trained and narrowed between riverside quays.
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Winter floods are rarely dangerous, but in January 1910 exceptionally heavy rainfall caused the river to rise above 28 feet at Paris, flooding the extensive low-lying quarters along its ancient meander loop (the Marais).