Evidence of the dependence of groundwater resources on extreme rainfall in East Africa
Groundwater recharge sustains the groundwater resources on which there is global dependence for drinking water and
irrigated agriculture. For many communities, groundwater is the only perennial source of water. Here, we present a newly
compiled 55-year record of groundwater-level observations in an aquifer of central Tanzania that reveals the highly episodic occurrence of recharge resulting from anomalously intense seasonal rainfall.