Feijão Forensic Seepage Analysis
After the catastrophic January 2019 failure of Dam I at the Córrego do Feijão iron-ore mine, a 3D seepage model was calibrated to the field pore-water-pressure record — water-level indicators, piezometers, CPTu dissipation tests, and drainage flows — collected in the years and months before the failure. Unsaturated, climate-driven modeling resolved the soil-suction regime above the water table, and the calibrated pore-water pressures were passed to the forensic deformation analysis.