THEMATIC SLIDES
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THEMATIC SLIDES. WATER AND LAKES. WATER AND LAKES. Lake Chad, Nigeria, Niger, Chad, Cameroon Challawa Gorge Dam, Nigeria Lake Nakuru, Kenya Lake Victoria, Uganda Lesotho Highlands Water Project, Lesotho Aral Sea, Kazakhstan Lake Balkhash, Kazakhstan

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THEMATIC SLIDES

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Thematic slides

THEMATIC SLIDES


Thematic slides

WATER AND LAKES


Thematic slides

WATER AND LAKES

  • Lake Chad, Nigeria, Niger, Chad, Cameroon

  • Challawa Gorge Dam, Nigeria

  • Lake Nakuru, Kenya

  • Lake Victoria, Uganda

  • Lesotho Highlands Water

  • Project, Lesotho

  • Aral Sea, Kazakhstan

  • Lake Balkhash, Kazakhstan

  • Kara- Bogaz -Gol (KBG), Turkmenistan

Estimated global water loss in irrigation

Source: FAO


Thematic slides

WATER AND LAKES

  • Dead Sea, Jordan

  • Lake Hamoun, Iran

  • Mesopotamia Marshlands, Iraq

  • Three Gorges Dam, China

  • Atatürk Dam, Turkey

  • Gabcikova, Slovakia

  • Lake Chapala, Mexico

  • Everglades, United States

Three Gorges Dam, October 24, 2003: Digital Globe


Thematic slides

WATER FACTS

  • Of total world water, 97.5% is salty water and only 2.5% is freshwater of which useable freshwater accounts for about 0.5%

  • Of the 0.5% useable freshwater, irrigation accounts for 70%, industry 20% and household 10%

  • Demand for and use of freshwater has tripled over the past half century,as world population has grown from 2.5 to 6.45 billion people

  • Experts predict that by 2025 global water needs will increase with 40% more required for cities and 20% for growing crops

  • The satellite photos show major freshwater depletion taking place on all continents, notably in the Dead Sea, the Aral Sea, Lake Chad, the Mesopotamian Marshlands, the Everglades and other water sources

  • According to UNESCO estimates, by 2030 global demands for fresh water will exceed the supply with potentially disastrous consequences

Sources: Asian Development Bank; BBC; Earth Observatory; UNEP; UNESCO


Thematic slides

WATER FACTS

  • Water withdrawals are causing major rivers—such as the Colorado, the Nile, the Yellow Rivers—to run dry, lakes to vanish and groundwater tables and aquifers to drop almost everywhere

  • Over the next 20 years, average water supply per person is estimated to drop by a third, endangering human health, agriculture and the environment

  • Water volume in the Aral sea has dropped by about 80% since 1960s, due to extensive irrigation primarily for cotton production

  • Current water levels in Lake Victoria are below normal and the lowest level since September 1961

  • In 2002, around 3.16 billion people (82%) in the Asia Pacific region had access to improved water supplies, up from 74% in 1990

  • Water pollution is a serious threat to the world’s water supply

Sources: Asian Development Bank; BBC; Earth Observatory; UNEP; UNESCO


Thematic slides

Shrinking Lake ChadNigeria, Niger, Chad, Cameroon

Persistent drought has shrunk the lake to about a tenth of its former size

  • 1972: Larger lake surface area is visible in this image

  • 2001: Impact of drought displays a shrunken lake, comparatively much smaller surface area than in 1972 image


Thematic slides

Impact of Challawa Gorge Dam, Nigeria

These images show the area before and after construction of the dam.

  • 1990: Image of the area before the completion of the dam in 1993

  • 1999: Impact of flooding upstream from the dam; colour of the water in the flooded area indicates high sediments


Thematic slides

Land cover degradation around Lake Nakuru, Kenya

These images show the land cover degradation in the lake’s catchment

  • 1973: The area that hosts the world’s largest concentration of flamingos

  • 2000: Excision of forest in the Eastern Mau Forest Reserve (white lines) will most likely lead to disappearance of upper catchment forest cover


Thematic slides

Water hyacinth in Lake VictoriaUganda

These images show water hyacinth infestation and control of such invasive species

  • 1995: Image shows several water-hyacinth-choked bays (yellow arrows)

  • 2001: A visible reduction of Water Hyacinth, after its removal from Lake Victoria, contributes to human prosperity


Thematic slides

Population growth around Lake VictoriaUganda

  • The population growth around 100 km buffer zone of the Lake Victoria

  • Population growth around Lake Victoria, East Africa, is the highest in Africa


Thematic slides

Fastest growing rural population around Lake Victoria, Uganda


Thematic slides

Lake Victoria vs. Africa


Thematic slides

Title

Height variation of Lake Victoria, Uganda

Body text

Lake Victoria Height Variations

http://www.pecad.fas.usda.gov/cropexplorer/global_reservoir/gr_regional_chart.cfm?regionid=eafrica&region=&reservoir_name=Victoria


Thematic slides

Title

Monitoring Lake Victoria, Uganda

Body text

Current water levels are below normal and the lowest level since September, 1961


Thematic slides

Changes due to dam construction in LesothoLesotho

The Lesotho Highlands Water Project diverts water for South Africa’s urban and industrial use

  • 1989: Image of the area before the completion of the dam in 1995

  • 2001: Katse dam created an enormous reservoir, the extent of which can clearly be seen in this image


Thematic slides

Death of a sea - Aral Sea, Kazakhstan

Images show death of the world’s fourth largest inland sea

  • 1973: The surface of the sea once measured 66 100 km2

  • 1987: 60% of the volume had been lost

  • 1999-2004: The sea is now quarter of the size it was 50 years ago


Thematic slides

Alarming drop in Lake Balkhash’s water levelKazakhstan

  • 1975-1979: Excessive use and waste of lake water are causes of the drop

  • 2001: Smaller neighbouring lakes appear to be drying up


Thematic slides

Kara-Bogaz-Gol – Lagoon of the Caspian seaTurkmenistan

Caspian Sea is the largest inland body of water in the world

  • 1988: KBG is the large shallow lagoon of the Caspian sea

  • 2000: Caspian Sea levels are higher than 1978 levels and water flows freely into salty waters of KBG


Thematic slides

Dramatic changes in Dead Sea, Jordan

Images show dramatic changes in the Dead sea over 30 years

  • 1973: The Sea level is dropping at the rate of 1m/year

  • 2002: Notice the expansion of salt works, and near-complete closing off of the southern part by dry land


Thematic slides

Changes in water levels on Lake HamounIran

Changes in water levels on Lake Hamoun

  • 1976: The amount of water in the lake is relatively high

  • 1999-2001: The lake dried up and disappeared


Thematic slides

Demise of an ecosystem – Mesopotamian Marshlands, Iraq

  • 1973-2000: Most of the wetlands disappeared

Upstream damming as well as drainage activities in the marshlands themselves have significantly reduced the quantity of water entering the marshes


Thematic slides

Restoration of the Mesopotamia Marshlands in Iraq

  • 2000: Water returns to the Mesopotamian Marshlands

  • 2004: Greening of some of the Marshlands in recent years


Thematic slides

Changes due to Three Gorges Dam construction, China

Changes due to the construction of dam

  • 1987: Nature of the river and surrounding landscape before the dam

  • 2004: The enormous dam is clearly visible


Thematic slides

Changes due to Atatürk Dam, Turkey

Development of Harran region is strikingly apparent in these images

Right-hand corner of the 1999 image shows irrigated fields surrounding the town of Harran

The dam provides power and irrigation water


Thematic slides

Damming around Gabcikova, Slovakia

1973-2000: Images show changes brought about by massive re-channeling of river water


Thematic slides

Country’s largest natural lake - Lake ChapalaMexico

  • 1983: Level of the lake has declined; noticeable decreases in wetlands

  • 2001: Alteration in the contours of the shoreline is clearly visible


Thematic slides

Urban encroachment in Florida’s EvergladesUnited States

  • 1973: Rapid urban expansion has converted farmlands to cityscapes

  • 2002: Existence of vast wetlands “Everglades” threatened by urban encroachment


Thematic slides

WATER AND LAKES

  • Lake Kivu, Congo/Rwanda

  • Lake Alaotra, Madagascar

  • Lake Al Wahda, Morocco

  • Lake Cahora Basa, Mozambique

  • Lake Chivero, Zimbabwe

  • Lake Djoudj, Senegal

  • Lake Ichkeul, Tunisia

  • Lake Manantali, Mali

  • Lake Sibaya, South Africa

  • Songor Lagoon, Ghana

  • Lake Tonga, Algeria


Thematic slides

LAKE FACTS

  • According to the WORLDLAKE database, there are 677 lakes in Africa

  • There are 15 natural lakes that cross the political boundaries of two or more countries in Africa

  • There are 60 transboundary river basins in Africa, covering over 63 per cent of the continent’s land area

  • Lake Chad’s surface area has shrunk by 95 per cent over the past 35 years

  • Uncontrolled damming, the withdrawal of water for irrigation, and climate variability are the major causes of drying up of Lake Tonga in Algeria

  • Population growth around Lake Victoria, the continent’s largest lake, is significantly higher than the rest of Africa

  • Some lakes in central Africa have become known as “killer lakes,” because of the catastrophic natural events that have occurred in their vicinity

Sources: UNEP 2006


Thematic slides

Lake Kivu-one of Africa’s “killer lakes”Congo/Rwanda

These images show dramatic changes before and after the eruption of Mt. Nyiragongo in 2002

  • 2001: Before the January 2002 eruption

  • 2003: Shows the track of the lava flow


Thematic slides

Severe flooding around Lake AlaotraMadagascar

These images show flooding over a wide area

  • Flooding destroys significant portion of crops

  • Intensive rice irrigation occurs at the western part of the lake (yellow arrows)


Thematic slides

Impact of Al Wahda reservoir in Morocco

These images illustrate the change in land cover

  • 1987: The area before the construction of dams

  • 2001: The area after the construction of 110 large dams


Thematic slides

Cahora Basa – Mozambique’s largest dam on the Zambezi River

These images show spectacular changes in the Zambezi riverine system

  • 1972: The Zambezi River a few years before the dam construction

  • 1999: This image shows part of the enormous dam and the lake


Thematic slides

Invasive water weeds in Lake Chivero, Zimbabwe

These images show overall reduction in water weeds

  • 1989: Weeds show up as green strands along the edges of the lake

  • 2000: This image shows that water weeds remains a persistent problem


Thematic slides

Rejuvenation of the Djoudj Sanctuary in Senegal

These images show the Djoudj Sanctuary before and after the construction of the Diama Dam

  • 1979: Shows the impact of drought on the Djoudj Sanctuary

  • 1999: Rejuvenation of the Sanctuary wetlands due to significant floods


Thematic slides

Ecological changes around Lake Ichkeul, Tunisia

These images show the impact of damming

  • 1972: Shows the three feeder rivers supplying the lake before they were dammed

  • 2000: Shows the location of the dams (yellow arrows)


Thematic slides

Agricultural expansion around Lake Manantali, Mali

These images show the expansion of irrigated agriculture

  • 1977: Shows the original meandering nature of the Bafing River

  • 1999: Shows the expanded irrigated land and increase in lake water quantity


Thematic slides

Lake Sibaya – wetland of international important in South Africa

These images show increase in cultivation around the lake

  • 1991: Lakeshore is home to the only known species of a rare climbing orchid

  • 2001: The yellow arrows vividly show the increase of cultivation of marginal lands around the lake


Thematic slides

Reduction in the surface area of Songor Lagoon, Ghana

These images show a conspicuous reduction in the surface area

  • 1990: Shows major lagoon system associated with Volta river estuary

  • 2000: This image shows water area dramatically reduced, exposing bare ground


Thematic slides

Changes in and around Lake TongaAlgeria

These images show the changes brought about by damming of the feeder rivers

  • 1988: Lake Tonga before the damming of feeder rivers

  • 2000: Damming increased irrigation and drastically reduced the volume of water entering the lake


Thematic slides

WATER

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