This project will be conducted to generate information on the hydrogeomorphic processes that shaped the nine nonwadeable rivers within the Samar Island Natural Park, namely: Catubig, Catarman and Pambujan rivers in Northern Samar; Calbiga, Gandara and Golden rivers in Western Samar; and Can-avid Oras, Suribao and Taft rivers in Eastern Samar. Channel migration zones (CMZ) will be delineated taking into account trends in channel movement, disturbance history, changes in boundary conditions, topography, bank erodibility, hydrology, sediment supply, and woody debris loading, to determine how habitat functions were affected by years of protection, and to predict areas at risk of channel erosion due to fluvial processes. Configurations of the rivers will be measured using a combination of manual, aerial and boat surveys, supported and validated by the Geographical Information System platform. Data will also be gathered from key informants in the community using a pre-structured survey questionnaire. The rivers will be assessed to determine Avulsion Hazard Zone (AHZ), Erosion Hazard Areas (EHA), and the Disconnected Migration Area (DMA). Policy recommendations and strategies will be formulated, to extenuate effects of natural hazards on humans and biodiversity and to protect and restore riverine and adjacent riparian areas.