Water Resources of Ethiopia

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Questions and Answers

What is the flow direction of the Awash River in the Rift Valley?

  • Southeast
  • Northwest
  • Southwest
  • Northeast (correct)

Which lake is the largest in the maze of lakes and marshes where the Awash River terminates?

  • Lake Afrera
  • Lake Abaya
  • Lake Tana
  • Lake Abe (correct)

What characterizes the Afar drainage sub-basin?

  • High evaporation rates and very little stream flow (correct)
  • Frequent flooding and river overflow
  • Abundant rainfall and lush vegetation
  • Year-round temperate climate

What is the primary reason for the formation of Lake Afrera and Asale?

<p>Tectonic activities (A)</p> Signup and view all the answers

Which rivers flow into Lake Ziway?

<p>Meki and Katar Rivers (D)</p> Signup and view all the answers

What term best describes the southern part of the Rift Valley sub-basin?

<p>Lakes region (C)</p> Signup and view all the answers

How do the lakes in the Rift Valley sub-basin primarily collect water?

<p>Mountain slopes' runoff (B)</p> Signup and view all the answers

What do Lakes Ziway and Langano have in common?

<p>Both are connected to Lake Abijiata (D)</p> Signup and view all the answers

What geographical feature primarily defines the lakes in the Rift Valley region?

<p>Fault depressions (A)</p> Signup and view all the answers

What is a major characteristic of the streams in the Rift Valley drainage systems?

<p>They flow in multiple directions (C)</p> Signup and view all the answers

What is the largest drainage system in Ethiopia in terms of area covered?

<p>Western Drainage System (B)</p> Signup and view all the answers

Which river in the Western Drainage System flows southward unlike others?

<p>Ghibe (Omo) River (B)</p> Signup and view all the answers

What percentage of the annual water flow is carried by the Abay River basin?

<p>65 percent (A)</p> Signup and view all the answers

Which river is classified as a tributary of the Nile after joining it in Sudan?

<p>Abay River (B)</p> Signup and view all the answers

What is the estimated mean annual flow of the Ghibe (Omo) River?

<p>16.6 billion cubic meters (D)</p> Signup and view all the answers

Which river system does not reach the Indian Ocean at its end?

<p>Wabishebelle River (C)</p> Signup and view all the answers

What geographical feature primarily influences the drainage systems in Ethiopia?

<p>Plateaus and escarpments (B)</p> Signup and view all the answers

Which river basin is the largest in terms of catchment area in the Southeastern Drainage System?

<p>Wabishebelle River (A)</p> Signup and view all the answers

Which river is the most utilized in Ethiopia?

<p>Awash River (D)</p> Signup and view all the answers

Which river basin in Ethiopia is primarily characterized by an inland drainage system?

<p>Rift Valley Drainage System (B)</p> Signup and view all the answers

What percentage of the earth’s total surface is covered by water bodies?

<p>71% (B)</p> Signup and view all the answers

How much of the earth's total water is classified as fresh water?

<p>2.5% (C)</p> Signup and view all the answers

Which of the following represents the largest portion of fresh water supplies?

<p>Glaciers (D)</p> Signup and view all the answers

What is the estimated surface water potential of Ethiopia?

<p>124.4 billion cubic meters (D)</p> Signup and view all the answers

Which term best describes the flow of water through well-defined channels?

<p>Drainage (D)</p> Signup and view all the answers

A drainage basin is defined as what?

<p>The region collecting runoff from a river and its tributaries (C)</p> Signup and view all the answers

What geographical characteristic contributes to Ethiopia being referred to as the 'water tower of Eastern Africa'?

<p>Its mountainous terrain and proximity to the equator (D)</p> Signup and view all the answers

What primarily determines the drainage pattern of an area?

<p>Geological processes and topography (D)</p> Signup and view all the answers

Which of the following is NOT a component of fresh water distribution?

<p>Atmospheric water vapor (D)</p> Signup and view all the answers

What does the term 'mouth' refer to in the context of a drainage system?

<p>The point where a river meets another water body (D)</p> Signup and view all the answers

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Flashcards

Drainage System

The flow of water within a well-defined channel, forming a branched network of interconnected streams and their surrounding land area.

Headwater/Source

A river's starting point, where water flows from a source like a spring or mountain area.

Mouth

The point where a river ends, usually emptying into a larger body of water like an ocean, lake, or another river.

Drainage Basin

The geographical area that's drained by a river and its tributaries.

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Watershed/Topographic Divide

The boundary line separating different drainage basins, usually formed by high ground or a ridge.

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Drainage Pattern

The pattern of how water flows across an area, influenced by geological structure, rock type, topography, and rainfall.

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Surface Water

Water sources that are readily available on the Earth's surface, including lakes, rivers, wetlands, atmosphere, and soil moisture.

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Ground Water

Water found beneath the Earth's surface, stored in underground layers called aquifers.

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River

A large body of water that moves naturally over land, usually flowing towards a lower elevation.

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Major Drainage Systems

The largest rivers emptying into the ocean, spanning vast areas and collecting numerous tributaries.

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Rift Valley Drainage

The Rift Valley drainage systems have streams flowing in all directions, with no single primary flow.

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Awash River Flow

The Awash River flows northeastward following the Rift Valley's orientation.

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Awash River Outlet

The Awash River empties into a complex of small lakes and marshlands, with Lake Abe being the largest, situated along the Ethiopia-Djibouti border.

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Afar Drainage

The Afar drainage sub-basin experiences minimal stream flow due to a lack of rain, high temperatures, and excessive evaporation.

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Afar Lakes

Lake Afrera and Lake Asale are the primary water bodies in the Afar basin, formed by tectonic activity rather than surface flow.

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Southern Rift Valley Sub-basin

The southern portion of the Rift Valley sub-basin is characterized by numerous lakes and smaller streams, hence the name 'lakes region'.

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Lake Locations

The lakes in the southern Rift Valley are located within fault depressions.

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Lake Water Supply

Small streams originating from nearby mountain slopes provide water for the lakes in the southern Rift Valley.

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River-Lake Connections

The Meki and Katar Rivers flow into Lake Ziway, the Bilate River flows into Lake Abaya, and the Segen River flows into Lake Chew Bahir, illustrating the stream-lake connection.

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Interconnected Lakes

Some lakes within the Rift Valley are interconnected, with Lake Ziway and Lake Langano draining into Lake Abijata through the Bulbula and Horocolo streams, respectively.

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Western Drainage Systems

The westward sloping highlands and lowlands of Ethiopia, encompassing major river basins like Tekeze, Abay, Baro-Akobo, and Ghibe (Omo).

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Southeastern Drainage Systems

The southeastern part of Ethiopia characterized by plateaus like Arsi, Bale, and Harerghe. It's drained by Wabishebelle and Ghenale rivers, which flow towards the Indian Ocean.

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Rift Valley Drainage System

The Rift Valley, characterized by its 'inward-sloping' escarpments, creating an inland drainage system. It's a unique section of Ethiopia with a different drainage pattern.

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Abay (Blue Nile)

The main river in the Western Drainage Systems, known for its large volume and contribution to the Nile River.

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Tekeze River

A major tributary of the Nile River that originates in the Ethiopian Highlands and contributes significantly to the Nile's flow.

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Baro-Akobo River

Flows through the wettest highlands of Ethiopia and contributes to the Sobat River in South Sudan. One section of it flows through marshy land.

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Awash River

The most utilized river in Ethiopia, originating in the highlands and flowing through different regions. It's associated with the Rift Valley drainage system.

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Ghenale River

A large river in the Southeastern Drainage Systems that flows towards the Indian Ocean. It's known for its size despite being smaller than the Wabishebelle.

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Wabishebelle River

The longest river in Ethiopia, located in the Southeastern Drainage Systems. It's known for its vast catchment area but doesn't reach the Indian Ocean, disappearing into the sands.

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Topography

The key factor that influences how rivers flow and the type of drainage system in Ethiopia. It determines the direction of the slope and the overall flow of the rivers.

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Study Notes

Water Resources of Ethiopia

  • 71% of Earth's surface is water, predominantly seas and oceans
  • Nearly 97.5% of Earth's water is saltwater
  • 2.5% of water is freshwater, distributed in glaciers (68.7%), groundwater (30.1%), permafrost (0.8%), and surface water (0.4%)
  • Surface water includes water in lakes, rivers, atmosphere, soils, and wetlands
  • Freshwater is unevenly distributed globally, influenced by latitude, climate, and topography
  • Ethiopia has a complex topography (highlands, rugged terrain, low plains), higher rainfall, and equatorial proximity that contribute to significant surface and groundwater resources
  • 0.7% of Ethiopia’s land area is water bodies
  • Surface water potential in Ethiopia is estimated at 124.4 billion cubic meters (BCM)
  • Ethiopia is considered the "water tower" of Eastern Africa

Major Drainage Systems of Ethiopia

  • Drainage is the flow of water through defined channels
  • A drainage system consists of a main river and its tributaries, flowing from a source (headwater) to a mouth
  • Drainage patterns are influenced by geology, rock structure, topography, and water flow
  • A drainage basin is an area where a river and its tributaries collect surface and subsurface water, bounded by a water divide
  • Ethiopia's drainage patterns are shaped by outward-sloping plateaus, inward-sloping Rift Valley escarpments, and geological faults
  • Ethiopia's drainage systems are broadly classified into Western, Southeastern, and Rift Valley systems

Western Drainage System

  • Largest drainage system, covering 40% of Ethiopia's area and carrying 60% of annual water flow
  • Four major river basins: Tekeze, Abay, Baro-Akobo, Ghibe (Omo)
  • Ghibe (Omo) flows southward, while Abay, Tekeze, and Baro flow westward to the Nile
  • Abay is the largest river in the Western system. Its basin covers 199,812 km2, and carries 65% of annual water flow, rising from Lake Tana & joins the White Nile in Khartoum
  • Tekeze (Atbara in Sudan) drains 82,350 km2 and carries 12% of annual water flow, flowing to the Nile
  • Baro-Akobo carries 17% of annual flow
  • Ghibe / Omo carries 6 % of annual flow and empties into Lake Turkana

Southeastern Drainage System

  • Drains most of southeastern Ethiopia
  • Primarily drained by Wabishebelle and Ghenale rivers, sloping southeastward across plains
  • Major highlands include the Arsi, Bale, Sidama, and Harerghe plateaus
  • Wabishebelle is the largest river in terms of catchment area (202,697 km2) and the longest in Ethiopia, flowing parallel to the coast before disappearing into the sand near the Juba River
  • Ghenale (Juba River in Somalia) drains a basin of 171,042 km2, carrying more water than Wabishebelle and reaching the Indian Ocean

Rift Valley Drainage System

  • Characterized by low rainfall, high evaporation, and small catchment areas, flowing in various directions
  • Primarily drained by the Awash River, which originates from the Shewan plateau, flows 1,250 km, and covers parts of multiple regions. It's the most utilized river
  • Awash flows northeast, ending in a maze of small lakes and marshlands (Lake Abe)
  • Afar sub-basin lacks significant stream flow, with Lake Afrera and Asale being the main surface waters (tectonically formed)
  • Southern Rift Valley sub-basin has numerous lakes and small streams, interconnected (e.g., Ziway, Langano, Abijata)

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