The flood hazards depicted in this site are the product of flood simulations using Flo2d, a Federal Emergency Management Agency (FEMA)-approved flood routing application software. The inundation maps were simulated using rainfall delivered by tropical storm Ondoy on 26 September 2009 over 3 arc second topography from the Shuttle Radar Topography Mission (SRTM). The rainfall event is considered as an extreme event that can generate floods with a 100-150 year return period.

These hazard maps are indicative inundation maps for large flood events and useful only for knowing where not to be during extremely heavy rainfall. For local governments, these flood hazard maps can be used for localized emergency response (i.e. evacuation and access routes, road closures, siting of key rescue facilities) and for urban planning. It should not be used for insurance and bank appraisal purposes.

These hazard maps are only as good as the topographic map base that was used in the flood simulation. Detailed and more accurate flood hazard maps of any city can be conducted upon request to the National Institute of Geological Sciences, University of the Philippines Flo2d simulation team (email us).

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