For the catchment process, we have the rivers Maipo and Mapocho in the Metropolitan Region, important sources for catching raw water flowing down from the Andes. In the south of the country, our sources are surface water catchments, together with groundwater aquifers. We hold the legal title to the water usage rights for all our sources.
In the center of the country, we have important water reserves to ensure the necessary supplies when source water is scarce. The three most important reserves in the Santiago Basin are: El Yeso reservoir, with a maximum capacity of 220 million m3; Laguna Negra, with 600 million m3, and Laguna Lo Encañado, with 7 million m3 ; and Estanques de Pirque, with 1.500 million of liters.