This hydrogeological system was named by the researcher and his collaborators ‘Grande Amazonia Aquifer System’ (Saga). "The Saga is a transboundary hydrogeological system, since it encompasses other countries in South America. But 67% of the system is located in Brazil," Abreu said.
"This underground reserve represents more than 80% of the total water of the Amazon. The water of the Amazonian rivers, for example, represents only 8% of the hydrological system of the biome, and the atmospheric waters have approximately the same percentage of participation" Abreu said during the 66th Annual Meeting of the Brazilian Society for the Progress of Science (SBPC).
According to Abreu, previous investigations indicated that the Alter do Chão Aquifer, in the Santarém district of the state of Pará, houses an underground freshwater reservoir with an estimated volume of 86.4 billion cubic meters.
"We were greatly surprised by the results of the study and so we decided to deepen them. To our amazement, we discovered that the Alter do Chão Aquifer integrates a hydrogeological system that includes the sedimentary basins of the Acre, Solimões, Amazonas and Marajó. Together, these four basins they have an area of approximately 1,300,000 square kilometers, "said the scientist.
However, Abreu points out that the volume of water from the Saga that can be used in the medium term for human and industrial supply, or for agricultural irrigation, will be very small, due to the size of the reserve and the depth of the wells built currently in the region, which do not exceed 500 meters and have a high flow, from 100 to 500 cubic meters per hour.