SunStar DRRMO to conduct dredging in Mandalagan river BACOLOD. The Bacolod City Disaster Risk Reduction and Management Office collects more than eight truckloads of garbage at Mambuloc Creek Monday, February 22, 2021. (DRRMO photo) + February 22, 2021 AFTER the dredging and excavation activities at Mambuloc Creek in Bacolod City, the Disaster Risk Reduction and Management Office (DRRMO) is planning to continue its operation in Mandalagan River in Barangay Mandalagan to ease flooding in some areas in the city. Executive Assistant Joemarie Vargas, cluster head of DRRMO, on Monday, February 23, 2021, said they will find a way to penetrate along Purok Carvic to ease flooding, especially near a mall in the area.