A study conducted by researchers at São Paulo State University (UNESP) in Brazil measured the contributions of rainwater and groundwater to the maintenance of springs and rivers in the vicinity of Brotas, a city in the central portion of São Paulo state located in the Upper Jacaré-Pepira sub-basin, where the urban water supply, agriculture and tourism rely strongly on groundwater.
Rainwater insufficient to replenish the Guarani Aquifer owing to overuse and drought, study warns
