Théols

The Théols is a French river, that flows in the Boischaut natural region.

Geography

The river is 42.3 km long and crops at 150 m near Bommiers in the Boischaut natural region; it joins the Arnon near Lazenay.

Hydrology

The river debit was studied from (1971 to 1975) at Sainte-Lizaigne (located about 10 km from its confluent with the Arnon). The surface observed was 797 km², over 90% of its watershed.

The river has an average debit of 2.99 m3/s at Sainte-Lizaigne.

The Théols is a plain river that varies little. It presents seasonal debital fluctuations. High waters are around from February to May, with medium debits from 3,5 to 5 m/s (peak February–March). From April, the flow rate decreases regularly toward low water (which lasts from August to October).

Floods are seldom important.

The daily maximal debit recorded at Sainte-Lizaigne was 32.3m3/s on March 22, 1974. Its yearly drainage basin precipitation is currently of 118 mm, just over a third of the national average (320 mm), which is also below the average of the Loire basin (+/- 245 mm) and the Arnon (200 mm). The discharge was hence of 3,75 L/s and by km² of basin.