River overflow

River overflow is one of the phases of the river's water regime, which repeats annually in the same season of the year; a relatively long and significant increase in the water content of the river, causing a rise in its level; usually accompanied by the release of water from the low-water channel and flooding of the floodplain.

High water is caused by increased continuous inflow of water, which can be caused by:

• the spring melting of snow on the plains;
• summer melting of snow and glaciers in the mountains;
• heavy rains.

Floods caused by spring snowmelt are typical for many lowland rivers, which are divided into 2 groups:

• rivers with a predominance of spring runoff (for example, Volga, Ural)
• rivers with a predominance of summer flow (for example, Anadyr, Yukon River, Mackenzie River).

Floods caused by the summer melting of mountain snows and glaciers are typical for the rivers of Central Asia, the Caucasus, and the Alps.

High waters caused by summer monsoon rains are typical for the rivers of Southeast Asia (Yangtze, Mekong).

• 
  La Gérine during the 2005 floods in Switzerland
• 
  Seine high water mark in Paris
• 
  In Dijon, the Ouche overflowing from its minor bed in the city
• 
  Flood under the Old Route 49 bridge crossing over the South Yuba River in Nevada City, January 2017
• 
  Overflow of the Rivière des Prairies in Montreal (Quebec) in May 2017

Bibliography

• Salomon, Jean-Noël (1997). L'homme face aux crues et aux inondations (in French). Presses Universitaires de Bordeaux. p. 136.