How does a confluence cause flooding?

What process causes flooding?

A flood occurs when water inundates land that’s normally dry, which can happen in a multitude of ways. Excessive rain, a ruptured dam or levee, rapid melting of snow or ice, or even an unfortunately placed beaver dam can overwhelm a river, spreading over the adjacent land, called a floodplain.

What are the 6 factors that cause flooding?


  • heavy rainfall.
  • long periods of rain.
  • snowmelt.
  • steep slopes.
  • impermeable rock (doesn’t allow water through)
  • very wet, saturated soils.
  • compacted or dry soil.

What are the main causes of stream flooding?

Floods occur when the discharge of the stream becomes too high to be accommodated in the normal stream channel. When the discharge becomes too high, the stream widens its channel by overtopping its banks and flooding the low-lying areas surrounding the stream.

Why is flooding more likely to occur at this confluence?

If the river’s valley has steep sides, water will quickly enter a river increasing the river’s discharge. … After heavy precipitation, the discharge will rise even more and floods are likely, especially at confluences (where a tributary meets the river) as this is where discharge is highest.

What is confluence in a drainage basin?

Confluence – the point at which two rivers or streams join. Tributary – a stream or smaller river which joins a larger stream or river. Mouth – the point where the river comes to the end, usually when entering a sea.

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How does urbanization cause flooding?

The changes in land use associated with urban development affect flooding in many ways. Removing vegetation and soil, grading the land surface, and constructing drainage networks increase runoff to streams from rainfall and snowmelt.

Where do floods mostly occur?

Where Do Floods Occur? River floodplains and coastal areas are the most susceptible to flooding, however, it is possible for flooding to occur in areas with unusually long periods of heavy rainfall. Bangladesh is the most flood prone area in the world.

How are dams responsible for causing floods?

How are dams responsible for causing floods? Ironically, the dams that were constructed to control floods have triggered floods due to sedimentation in the reservoir. … Release of water from dams during heavy rains aggravate the flood situation.

What are the man made causes of flood?

What human factors contribute to flooding?

  • Land-use activities such as urbanization increase run-off volume and rate,
  • Occupation of the flood plain obstructing flows,
  • Structural flood control measures such as embankments in the upstream,