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Water resource in West Africa: Potential, usages and prospect

IWRA World Water Congress 2008 Montpellier France
1. Water availability, use and management
Author(s): Hama Maïga
Bruno Barbier
Hama Maïga (2IE) Bruno Barbier (CIRAD)

Keyword(s): water management, irrigation, hydroelectricity, clean water, sanitation, water policies

Abstract West Africa displays the worst indicators in terms of water services. Access to clean water and sanitation, irrigation and power from hydroelectric dams is less developed than anywhere else in the world despite the progress made during the last decades. Children mortality, closely linked to water quality, is still among the highest. As irrigated area is insignificant, agriculture is almost completely climate dependant, and the climate is also the most variable on earth. The hydroelectric potential is still very important, since the potential of the mountains of Fouta Djalon is almost untapped, while energy costs are the highest in the world. Sanitation networks are rare or deficient while wetlands, rich in biodiversity are disappearing or increasingly contaminated. Water use is becoming an increasingly contentious issue in West Africa and might become a major constraint to economic development. The combination of rapid population growth, even faster urbanisation and robust economic growth fuels the demand for better public services. As food security remains a priority, farmers and herders are asking for more irrigation scheme, wells and boreholes. However competition for water is rife. As oil and natural gas prices are rising, hydroelectric projects reappear on policy makers’ and donors desks. Where should the money go: drinking water, food security or electric power? Proper use of the water resources will require new discussion between states sharing the major hydrologic basins and the transnational aquifers. The river basin authorities have become the central place of decision making as well as the ECOWAS sponsored West African Power Pool particularly concerned by hydroelectric investments. Hydroelectricity is perceived as a sound alternative to hydrocarbures, but it will be constrained by climate variability. The ongoing West African power interconnection is bound to reduce the risk of power shortage but the characteristics of the west African monsoon make rainfall levels quite covariant. Water flow in the Senegal, Niger and Volta rivers are similar. A major drought means a deficit everywhere in West Africa. The choice of investments will require sound and sophisticated technical and economic analysis which will incorporate the calculation of risk of extreme events. An effort of imagination and research is also required to improve irrigation, because current methods are expensive, not really cost effective and fragile. Irrigated rice production displays poor competitiveness in regards to Asian imports and local high value crops such as vegetable and fruit production which are in full expansion. High value crops display serious problems of contamination by pesticides. Public concern for water quality will increase as consumers are becoming more demanding. Clean water for human consumption will require compromise between dams, pumping the aquifers and maybe desalted water for large coastal cities. A key question is whether cities can afford complex urban sanitation network based on water. This water will have to come from surface water, better if it is recycled. Overall West Africa has a fair potential in water resources, be it surface water or aquifers, to satisfy the growing demand. It requires new plans to improve its infrastructure. The plans will need to be managed at the ECOWAS level because the water resources cross boundaries. But African technical and managerial capacities need to be improved to permit the investment plan to achieve both rapidity and sustainability.
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