Interdisciplinary studies for the knowledge of the groundwater fluoride contamination in the eastern African rift: Meru district - North Tanzania

摘要: This research was aimed at finding fresh and safe groundwater easily deliverable to an area, located in Northern Tanzania. The study area suffers water shortage, due widespread alkaline volcanism, high fluoride contents (F- up 70 mg/l) affects the groundwater. The achievement of this goal has been pursued through a multidisciplinary approach research. The stretches over 440 km2 lies northern part Arumeru District. Climate is semi-arid, with dry relatively rainy seasonal alternance. Four principal hydrogeological complexes have identified within different lithologies. They occur volcanic formations, singularly or superimposed each other. Subordinate perched aquifers are present sedimentary formations local occurrence. flow system interpreted on base springs spatial distribution joined lithological geometrical reconstruction aquifers. dominant pattern consisting multidirectional from higher elevation south, towards lower north complicated by occurrence structures such as graben, faults, lava dome tholoids. After identification main source, interference among F surface drown. Finally, aquifer be individuated structural where input prevented which well drilled, able supply least 3.8 l/s low fluoride.