Presentation on theme: "Water and Climate Change in Africa Raffaello Cervigni The World Bank."— Presentation transcript:
Water and Climate Change in Africa Raffaello Cervigni The World Bank
Key Messages 1.The present: water management is a major constraint to Africas development 2.The future: climate change will make those constraint even more severe 3.The opportunity: climate change will increase the urgency of reforms and investments that would be important anyway 4.The challenge: we need both more knowledge, and more resources
Hydrological variability has huge impacts on poverty & livelihoods Relationship holds even in diverse middle income economies with substantial water storage infrastructure e.g. Morocco
Inability to smooth water availability has multi-sectoral implications Under present conditions (water storage, agricultural development, transport infrastructure etc), hydrologic variability reduces potential economic growth in Ethiopia by 38% and increases poverty by 25% A single drought over a 12-year period will decrease average GDP growth rates by 7-10%
Countries across continent already facing different kinds of water crisis Under-use in SSA, limited margins in North Africa
Water storage south of the Sahara is woefully under-developed
Water management in Africa is particularly challenging, because international river basins are predominant
What is expected to change? Temperature: –Expected to increase 2°- 6°C (over next century) with greatest impact over the semi- arid margins of the Sahara and central southern Africa and least in equatorial latitudes and coastal environments. Precipitation: –Projected future changes in mean seasonal rainfall in Africa are less well defined.
Severe, but diverse impacts Percent change in run-off: multi-model average for the winter and summer precipitation (A1B SRES scenario) Reduction of 20 to 30% by 2050 Source: Milly et al (2005), published in Nature Increase of 20 to 30% by 2050
In water-scarce countries, agriculture will change Rain-fed agriculture will become less reliable Water allocations to agriculture will fall significantly –Urban use will take priority and urban populations growing New irrigation schemes will have to be designed for lower water availability Less surface water will encourage users to use groundwater Controlling this is a highly complex institutional challenge Reduced water availability in agriculture increases dependence on trade (high value crops for export, import of staples)
When countries can smooth consumption, agriculture becomes much more stable
Improved monitoring, assessment of water balance Improved planning and allocation processes, including internationally Strengthening institutions to manage water Investments Actions needed will become all the more important
There will be no substitute for reform It will become all the more important to review –Policies that promote activities that are particularly vulnerable to precipitation E.g. subsidies for rainfed wheat production in North Africa –Plans for new infrastructure where institutions are not yet ready to generate the potential benefits
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