Mauritania has average rainfall of just 92 mm/year. Groundwater is therefore of great importance in the country, with pressure on sources at 43.3 per cent (AMCOW 2018). Roughly 90 per cent of the water for irrigation comes from surface-water sources (FAO 2018). Internal renewable groundwater resources are 84.8 m3/year per person compared with internal renewable water resources which are only 28.3 m3/year per person(AMCOW 2018).
From collection: Sanitation and Wastewater Atlas of Africa – Country Profiles 5