Risk analysis of Brazilian dams (SNISB/PNSB universe). Project 1: 169 dams with urban surface water intakes downstream within the rupture reach (D_max). Project 2: 361 dam pairs with cascade failure potential identified via BHO hydrographic network (Pfafstetter + nudistbacc). Methodology by COSEB/Terrahidro, July 2026. (under construction and validation)