Water for agriculture draws on a range of sources - from naturally available water bodies to water supply infrastructure. In sub-Saharan Africa, only a very small percentage of arable land is irrigated. Most farmers produce food under rainfed conditions. In 1995, for instance, 89 percent of cereal production in sub-Saharan Africa was delivered from rainfed agriculture, compared to 58 percent in the West Asia and Northern Africa region (InterAcademy Council, 2004). The situation in the Sahel is very much in line with this trend.