River Processes

July 2015

Streambank cultivation,gold panning and other human activities

By |2017-01-17T11:20:27+02:00July 9th, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Bananas growing near a stream. Image credit MediaWiki.

Bananas growing near a stream. Image credit MediaWiki. ZIMSEC O Level Geography Notes: River Processes: Stream bank cultivation
  • Stream bank cultivation refers to the practice of growing or cultivation of crops near a wetland, stream or river.
  • Sub-Saharan Africa has faced political, socio-economic problems […]

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The construction of dams for multiple purposes

By |2017-01-17T11:20:28+02:00July 9th, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Lake Kariba. Image credit newsday.co.zw

Lake Kariba. Image credit newsday.co.zw ZIMSEC O Level Geography Notes: River Processes: The construction of dams for Multiple purposes
  • a barrier constructed to hold back water and raise its level, forming a reservoir.
  • Daming involves the building across a river to hold the water back.
  • Strictly speaking the […]

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River capture

By |2017-01-17T11:21:09+02:00July 1st, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

River capture.

River capture. ZIMSEC O Level Geography Notes: River capture
  • This is a process where one River captures the headwaters on a nearby stream.
  • This can occur due to several reasons viz:
  • Tectonic earth movements, where the slope of the land changes, and the stream is tipped out of its former course.
  • Natural damming, […]

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The hydrological / Water cycle

By |2017-01-17T11:21:10+02:00July 1st, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

The hydrological cycle. Image credit BBC

The hydrological cycle. Image credit BBC ZIMSEC O Level Geography Notes: The hydrological cycle.
  • Water does not leave or enter the planet earth.
  • It is instead continuously transferred between the atmosphere and the oceans.
  • The system of inputs, storages,flows and outputs is known as the water or hydrological […]

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Surface Water flow and the origin of rivers

By |2017-01-17T11:21:11+02:00July 1st, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Natural Springs contribute their water to rivers and often form the source of rivers. Image credit paintballfun.com

Natural Springs contribute their water to rivers and often form the source of rivers. Image credit paintballfun.com ZIMSEC O Level Geography Notes: Surface Water Flow and the Origin of rivers

Surface water flow and […]


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Drainage Basin

By |2017-01-17T11:21:12+02:00July 1st, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

The drainage basin. Image credit BBC.

The drainage basin. Image credit BBC. ZIMSEC O Level Geography Notes: Drainage Basin
  • The term drainage basin refers to an area of land drained by a river and its tributaries (river system).
  • It includes water found in the water table and surface run-off.
  • The drainage basin is also known […]

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Drainage Patterns

By |2017-01-17T11:21:12+02:00July 1st, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Image credit fanshare.com

Image credit fanshare.com ZIMSEC O Level Geography Notes: Drainage Patterns.
  • Drainage pattern is a term that refers to the way in which a river and its tributaries arrange themselves in the drainage basin.
  • The drainage pattern evolves over a long period of time and is affected by such factors […]

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June 2015

River rejuvenation

By |2017-01-17T11:21:33+02:00June 23rd, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

Paired terraces resulting from rejuvination. Image credit Geographyas.info

Paired terraces resulting from rejuvination. Image credit Geographyas.info ZIMSEC O Level Geography Notes: River Rejuvination
  • Rejuvenation-occurs when there is a negative change in a river’s base level (i.e. when the river’s base level falls) which increases its potential energy and thus enables it […]

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River Regime

By |2017-01-17T11:21:33+02:00June 23rd, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

 

The river Nile. Image credit historymuseum.ca

The river Nile. Image credit historymuseum.ca ZIMSEC O Level Geography Notes: River Regime
  • A river regime is the term used to describe the annual variations in a specified river’s discharge.
  • A river’s discharge is the volume of water flowing through a river channel.
  • This is the total […]

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Deltas

By |2017-01-17T11:21:37+02:00June 21st, 2015|Notes, O Level Geography, Ordinary Level Notes, River Processes|

A satellite photo of the Nile Delta. Image credit Flckr.com

A satellite photo of the Nile Delta. Image credit Flckr.com ZIMSEC O Level Geography Notes: Deltas
  • A delta is a gently sloping depositional feature that is found at a river’s mouth where it empties into a sea or ocean that extends […]

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