Abstract
This study aims at examining flood damage in the eastern fringe of Metro Manila by 2009 tropical storm Ondoy in comparison with the previous study for the 1989 flood in the same area. Data on distribution of flood depth were obtained from the National Mapping and Resource Information Authority and overlaid with the landform classification map using GIS in order to understand landform-flood relationships for the whole study area. Then the two sample sites for detailed field investigation were selected and field interviews with local people were conducted for verifying field situations of flooding. As the results, it was revealed that 100-year return period heavy rainfall by Ondoy was causing higher floodwater level at the meandering point along the Marikina River accelerated by the recent completion of the several bridges, and the subdivision situated on a former river course was got serious flood damage due to the dyke break. In contrast, a lacustrine plain was not seriously submerged as reported by the previous study due to the completion of the lakeshore dyke and drainage pumping stations; however, the lakeside subdivision built in an informal planning process was inevitably submerged.
