In recent years, floods frequently occur in the world, which cause serious damage of
properties and loss of lives. An assessment of flood risk in the river basin is thus very important for
development activities and river basin management. In this study, the flood damage assessment method
was developed for the assessment of flood risk in data-poor river basins by using physical based
numerical model, satellite-based information and socio-economic factors. The Pampanga river basin of
the Philippines was selected for the case study. For the flood damage assessment, the hazard
characteristics such as flood depth and duration were computed by using Rainfall Runoff Inundation (RRI)
model. Agriculture and household which are major exposures in the flood prone areas were taken into
account for the flood damage assessment. The potential damages of agriculture were estimated by using
the damage function of agriculture and flood characteristics. The damage functions of agriculture for its
each growing stages were defined as the function of flood depth and duration. Field investigation and
questionnaire surveys were conducted at the selected Barangays (Villages) in the Pampanga river basin
to develop methodology for household damage estimation. The appropriate damage functions for
household building and assets damages were developed based on the flood and household
characteristics. The estimated damages of agriculture and household were consistent with the reported
values. The developed method can be applied in other river basins where damages data are poorly
available.