Meteorologist Suheily López Belén reported on 2026-06-25 that rain recorded in Las Piedras on Monday is flowing toward the Carraízo reservoir following a surge in the Río Gurabo. ^[1] The Carraízo Reservoir in Puerto Rico returned to the 'observation' level on September 1, 2026, after rainfall from the remnants of Tropical Storm Dolly. ^[2] A surge in the Río Gurabo was recorded at 6:38 p.m. in the Río de Las Piedras neighborhood, which is part of the Río Grande de Loíza watershed. ^[3] The Authority of Aqueducts and Sewers (AAA) reported that remnants of Tropical Storm Dolly caused a slight increase in water levels for 14 reservoirs over the last 24 hours. ^[4] The Carraízo reservoir in Trujillo Alto increased by seven centimeters to reach 37.14 meters and remains under operational adjustments, 14 centimeters away from entering the control phase. ^[5] The Carraízo Reservoir needed to reach a water level of 38.50 meters to exit the 'operational adjustments' level and return to the 'observation' level. ^[6] Fifteen reservoirs in Puerto Rico recorded increases in water levels, while four experienced declines, as of September 1, 2026. ^[7] The remnants of Tropical Storm Dolly brought rainfall and thunderstorms to parts of eastern Puerto Rico, causing the water level increases in reservoirs. ^[8]