The document summarizes a public presentation on Typhoon Ondoy (Ketsana) and the Marikina River flood of September 26, 2009. It includes information on rainfall intensity and flood frequency statistics for the Marikina River Basin. It also discusses hydrologic modeling of the basin that was conducted, which estimated a peak flood discharge of 5770 cubic meters per second for the 2009 event, exceeding the previous 100-year flood level.