Africa Water Atlas_PPT


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Africa Water Atlas_PPT

  2. 2. Revealed through :  224 maps  104 satellite images  500 graphics and  Hundreds of compelling photos A VISUAL ACCOUNT OF AFRICA’S ENDOWMENT AND USE OF WATER RESOURCES……….
  3. 3.  The economy and development  Health  Food security  Transboundary cooperation  Capacity building  Environmental change, and  Gender …….AND ITS ROLE IN
  6. 6. FROM “HOTSPOTS” TO “HOPESPOTS” The nature of water issues in Africa is often contradictory:  Surplus and scarcity  Under-development and overexploitation  Challenges and opportunities
  7. 7. ANNUAL WATER BALANCE Annual water balance is an estimate of the available runoff after evapotranspiration — water that is potentially available for harvesting The red hatching overlaying the water balance map shows where population density >20 persons per km2 coincides with areas defined as arid or semi-arid
  8. 8. “HOTSPOTS” and “HOPESPOTS” Areas of population density >20 persons per km2 that coincide with arid and semi-arid zones are potential hotspots of vulnerability for water-constrained rain-fed agriculture (red hatch marks) Many of these areas have adequate runoff for filling small farm ponds, which can reduce vulnerability and improve food security
  9. 9. WATER TOWERS OF AFRICA These are areas identified by:- •Relative elevation (generally 200–800 m above the surrounding area) • Precipitation above 750 mm • Runoff above 250 mm • And the contribution they make to water resources for populations beyond their delineated boundaries
  10. 10. Many areas had already been converted to agriculture in the 1970s. Farm fields show as light and dark patches with straight edges between the dark-green forest areas By 2009, several additional large forest areas had been converted to agriculture— see areas indicated by the yellow arrows KENYA’S MAU FOREST COMPLEX
  11. 11. KATSE DAM SITE The 1991 image shows parts of the project area before Katse Dam was constructed while the 2010 image was taken after the dam had been filled and shows the area inundated
  12. 12. MOHALE DAM SITE The 1991 image shows parts of the project area before Mohale Dam was constructed The 2010 image was taken after the dam had been filled and shows the area inundated
  14. 14.  Africa is the world’s second-driest continent  With 15 per cent of the global population, it has only 9 per cent of global renewable water resources  Water is unevenly distributed and Africa’s climate is characterized by an overall unreliability of rainfall  Increases in access to improved drinking water sources and sanitation facilities are not keeping pace with population growth  Water scarcity is not simply due to geography: population growth, rapid urbanization, poor planning and poverty are significant factors KEY FACTS
  15. 15. TOTAL RENEWABLE WATER RESOURCES There are wide differences in natural water distribution within Africa’s sub-regions and countries
  16. 16. DISTRIBUTION OF DAMS There is about one dam to every 683 000 persons in Africa, while the equivalent figure for the rest of the world is 168 000 More than 1 270 dams have been built on rivers in Africa to store water and supply hydropower and irrigation water
  17. 17. SELECTED REGIONAL DEMOGRAPHIC INDICATORS Countries with high population densities include Nigeria in West Africa, which is also the most populous nation on the continent with more than 150 million people (166 people per km2) and the Central African nations of Rwanda (394 people per km2) and Burundi (314 people per km2). It is estimated that the West Africa sub-region will still be the most populous by the year 2050
  18. 18. AVERAGE WATER COLLECTION RESPONSIBILITIES IN AFRICA African women often perform between 65 and 72 per cent of water collection duties
  20. 20. The continent’s 63 international river basins  Cover about 64 per cent of its land area  Contain 93 per cent of its total surface water resources  Are home to 77 per cent of Africa’s population SURFACE WATER
  21. 21. Groundwater is an important source of freshwater and it is essential to supplement the surface water resources in a region that is increasingly affected by recurrent drought Africa is endowed with large and often under-utilized aquifer resources, predominantly in the large shared sub- regional sedimentary systems of the Sahara and Central and Southern Africa GROUNDWATER
  22. 22. MAJOR TRANSBOUNDARY RIVER BASINS The major transboundary basins of Africa present a variety of challenges and opportunities to the people and countries who share them
  23. 23. CONGO RIVER BASIN  3 700 000 km2  2 000 km across both its north-south and east-west dimensions  It straddles the equator, gathering heavy precipitation that falls on the tropical rainforests covering much of its extent The Congo River runs 4 670 km in a counter-clockwise arc around eastern and northern Democratic Republic of Congo, finally turning west toward the Atlantic Ocean where it discharges 40 000 m3 of water every sec
  24. 24. LAKE CHAD BASIN The watershed basin of Lake Chad makes up just over eight per cent of the surface area of Africa, and falls across the boundaries of eight countries Lake Chad is among the largest freshwater reservoirs in the Sahel
  25. 25. While Lake Chad’s surface area fluctuates considerably with the seasonal rains, these dry-season images of Lake Chad show the long-term trend since the 1960s Changes in rainfall during this period have been a major factor as has diversion for irrigation LAKE CHAD’S VARIABILITY
  26. 26. LAKE TURKANA BASIN Although the Lake Turkana Basin occupies parts of four countries, 98 per cent of its area lies within just two of them. More than half (52 per cent) is in Ethiopia, where almost three- quarters of the basin’s rain falls Lake Turkana is the largest desert lake in the world
  27. 27. GIBE III DAM SITE The Gibe III dam was roughly one-third of the way to completion when this March 2009 image was acquired It is expected to be finished around the end of 2013
  28. 28. NIGER RIVER BASIN The Niger River begins in the Fouta Djallon highlands in eastern Guinea and in the extreme north-western corner of Côte d’Ivoire. At 1 635 mm/yr in Guinea and 1 466 mm/yr in Côte d’Ivoire, the mean annual precipitation is the heaviest in the basin The Niger River sustains an island of vegetation and life in the harsh Sahel
  29. 29. After drying up in the 1990s Lake Faguibine has not refilled significantly, however some pooling has occurred during wet years. Work is underway to clear debris from channels that feed the lake LAKE FAGUIBINE
  30. 30. The inland Niger Delta’s annual floods were dramatically reduced during the great droughts of the 1970s and 1980s. In 2009, precipitation and flooding were more normal INNER NIGER DELTA
  31. 31. NILE RIVER BASIN Almost 78 million people in Egypt depend heavily upon the Nile Nile Basin has three of the heaviest population concentrations in Africa; surrounding Lake Victoria in Kenya and Uganda; in the Ethiopian Highlands surrounding the Blue Nile; and along the banks of the Nile in Egypt Egypt accounts for only 9% of the basin’s area, and holds almost a third of its population. In contrast, almost 64% of the Basin falls in Sudan but about half as many as in Egypt live there
  32. 32. DAMS AND WATER PROJECTS Development projects are underway in several of the basin’s countries and are being considered in others. They include hydropower dams, irrigation projects, and other water-diversion projects
  33. 33. COASTAL EROSION Rosetta Promontory lost over 3 km to erosion between 1968 (yellow line) and 2009 (red line)
  34. 34. Damietta Promontory, formed by one of the two principle outlets of the Nile River, eroded 1.5 km between 1965 (yellow line) and 2008 (red line) THE SINKING NILE DELTA
  35. 35. SENEGAL RIVER BASIN The Senegal River’s two primary tributaries are the Bafing and the Bakoye Rivers, both originating in the Guinea Highlands. The river’s transboundary nature makes managing the Senegal River Basin’s water resources very complex and challenging
  36. 36. IRRIGATION DEVELOPMENT IN THE SENEGAL RIVER BASIN The two satellite images show the dramatic changes in a segment of the middle river valley
  37. 37. DJOUDJ AND DIAWLING WETLANDS Years of drought and the construction of two dams brought the Djoudj and Diawling wetlands to a low point in the 1980s. After changes in artificial impoundments and water flows, the wetlands rebounded
  38. 38. MANANTALI DAM IN SENEGAL RIVER BASIN The Manantali Dam in western Mali was one of two large dams built in the Senegal River Basin in the 1980s by the Organisation for the Development of the Senegal River (OMVS)
  39. 39. TRANSBOUNDARY AQUIFERS Just as there are internationally shared river basins, there are also internationally shared, or transboundary, water resources and aquifers hidden underground
  40. 40. NUBIAN SANDSTONE AQUIFER The Nubian Sandstone Aquifer System underlies virtually all of Egypt, much of eastern Libya, and significant areas of northern Chad and northern Sudan
  41. 41. DESERT OASIS DEVELOPMENT- DAKHLA OASIS Dakhla Oasis, 1986-2010 Archeologists believe that the Dakhla Oasis has been continuously settled for around 8 000 years
  42. 42. EXPANSION OF IRRIGATED AGRICULTURES RELYING ON FOSSIL GROUNDWATER The expansion of center- pivot irrigation (green and brown circles) is supplied by water from wells drawing from the Nubian Sandstone Aquifer System, which are a part of the Great Man-Made River Project
  43. 43. COASTAL AQUIFERS Abstraction of freshwater from coastal aquifers can lead to saltwater intrusion as sea water replaces the water that is withdrawn. A thorough understanding of the underlying hydrogeology is needed to manage this risk
  47. 47. CHALLENGE 1: PROVIDE SAFE DRINKING WATER Africa as a whole is not expected to meet this MDG drinking water target; of its 53 countries, only 26 are on track to meet it. The high incidence of water-related and waterborne diseases related to the lack of safe drinking water is a drain on human and financial resources Number of people without access to an improved source of drinking water (millions)
  48. 48. CHALLENGE 2: ENSURE ACCESS TO ADEQUATE SANITATION Exploding peri-urban and slum areas; economic growth and higher demand; geographical isolation; dearth of public utilities and regulation; and high costs of water provision. Number of people without access to improved sanitation facilities
  49. 49. Number of cellphone users against the population served with improved sanitation The number of mobile phone users in Africa has grown Exponentially, while sanitation adoption has only increased mathematically MOBILE PHONE VS SANITATION
  50. 50. CHALLENGE 3: FOSTER COOPERATION IN TRANSBOUNDARY WATER BASINS Recognize and build on water as a binding factor between otherwise hostile states; and learn from successful transboundary cooperation efforts and agreements among African states.
  51. 51. CHALLENGE 4: PROVIDE WATER FOR FOOD SECURITY Agricultural growth is the mainstay of most African economies; agriculture is the greatest user of water in Africa; there is inadequate water use for sustainable food production; Africa suffers from food insecurity and 30 per cent of the population lives with chronic hunger
  52. 52. IRRIGATED AREAS Two-thirds of sub- Saharan Africa’s over six million hectares of irrigated land is found in only three countries: Madagascar, South Africa, and Sudan
  53. 53. CHALLENGE 5: DEVELOP HYDROPOWER TO ENHANCE ENERGY SECURITY The capacity to generate hydropower is unequal across the continent; climate change will exacerbate rainfall variability and hinder hydro potential; and hydro dams will need to avoid the environmental and social impacts historically characteristic of large dam developments Hydro contribution to Africa’s primary energy needs, 2002
  54. 54. Many African nations have a per capita electricity consumption of less than 80 kWh/yr compared to 26 280 kWh/yr in Norway, 17 655 kWh/yr in Canada, and 13 800 kWh/yr in the United States
  55. 55. PROPOSED TRANSMISSION SYSTEM FROM THE GRAND INGA Grand Inga would generate 44 000 MW of electricity— enough to power the entire continent of Africa
  56. 56. DIFFERENT VIEWS: How much hydro potential has Africa developed? Regional development of economically feasible hydropower potential
  57. 57. CHALLENGE 6: MEET GROWING WATER DEMAND Demand for water is increasing with population growth and economic development; development of water resources is inadequate; prices to access water are generally distorted; and water provision is highly inefficient
  58. 58. CHALLENGE 7: PREVENT LAND DEGRADATION AND WATER POLLUTION Lack of valuing of ecosystem services; political instability and conflict within and between countries; poor agricultural practices and farming on marginal lands that affect water use or water resources; and lack of structured water monitoring and governance
  59. 59. CHALLENGE 8: MANAGE WATER UNDER GLOBAL CLIMATE CHANGE Global warming and its human cause are undeniable; warming patterns in Africa are consistent with global ones; Africa is already subject to important spatial and temporal rainfall variability; drought in Africa is common and some regions are becoming drier; Africa’s repeated drought cycles kill thousands of people each event; and floods also occur regularly with severe impacts on peoples’ livelihoods Mount Kilimanjaro’s glaciers are melting
  60. 60. LATE 20TH CENTURY WARMING IN LAKE TANGANYIKA UNPRECEDENTED SINCE AD 500 Lake Tanganyika, the world’s second-largest (by volume) and second deepest lake after the Lake Baikal, has become warmer. Changes in the lake- surface temperature have affected its ecosystem, which heavily relies on nutrient recharge from the depths, the lake’s base of the food chain
  61. 61. GLACIAL RECESSION IN THE RWENZORI MOUNTAINS The glaciers declined by 50 per cent between 1987 and 2003. This glacial recession is generally attributed to increased air temperature and decreased snow accumulation during the 20th century.
  62. 62. Trend in the number of recorded flood and drought events in Africa
  63. 63. Number of people killed and affected by Africa’s worst droughts Number of people killed and affected by Africa’s worst floods
  64. 64. CHALLENGE 9: ENHANCE CAPACITY TO ADDRESS WATER CHALLENGES Africa faces a situation of economic water scarcity; and current institutional, financial and human capacities for managing water are lacking.Inadequate and unsustainable funding arrangements for water resources management; insufficient knowledge base; lack of an effective research and technology base; and weak institutional arrangements and legal frameworks for the ownership, allocation and management of water resources.
  66. 66. Goal 7 relates to environmental sustainability and includes targets to address the issue of water. The targets are to halve, by 2015, the proportion of people without sustainable access to safe drinking water and basic sanitation. MDG GOAL 7 Tracking Progress Towards Environmental Sustainability
  67. 67. An improved drinking water source: is protected from outside contamination, in particular from contamination with faecal matter. For monitoring purposes, the use of improved drinking water sources has been equated to access to safe drinking water, but not all improved sources in actual fact provide drinking water that is safe. An improved sanitation facility: hygienically separates human excreta from human contact.
  69. 69. PROGRESS TOWARDS MDG IMPROVED DRINKING WATER TARGET BY COUNTRY, 2008 Three hundred and fifty four million people of Africa had access to improved sanitation facilities in 2006. Coverage increased from 33% in 1990 to 38% in 2006
  70. 70. PROGRESS TOWARDS MDG SANITATION TARGET BY COUNTRY, 2008 To meet the MDG sanitation target, coverage needs to increase from 38 per cent in 2006 to 67 per cent in 2015
  71. 71. THANK YOU