How We Do It
     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.

Frequently Asked Questions:

Q: Do the flood maps take into account pumping stations, spillways, canals, and the like?
A: The flood maps are based off elevation data, and only major infrastructure has been taken into account (i.e. dams). Flood mitigation infrastructure, especially for small areas, were not accounted for. Just the same, man-made basins and garbage build-up can cause a difference between the hazard map and the real thing.

Q: Why didn't my street flood during the last typhoon, but it says on the map that it will flood?
A: The amount of rainfall expected to generate these kinds of flood is the same as Ondoy (average rainfall within a month, compressed into less than a day). If it did not flood where it was supposed to during the last typhoon, then the typhoon did not release the same amount of rainfall as Ondoy did.

Q: Why is this street not flooded on the map, but it flooded there during Ondoy.
A: The basemap used for the simulations are only accurate up to a 90 by 90 meter area, so streets and houses located within this area may experience inaccuracies. Adjacent streets and areas (where the elevation has changed) may be the ones flooded but your street is not.

Q: Did it flood in insert name of street here during Ondoy/the last typhoon?
A: Please check the map yourself, we do not commit to memory each and every street and area which does or does not flood.

Q: Do you have a flood hazad map of insert place here?
A: All the areas where we have produced flood hazard maps are already uploaded, and we upload them as we finish them. We do not have the resources or volunteers to regularly release hazard maps, so requests will have to be made to prioritize certain areas and compensation given to those who will produce it.

Q: I intend to buy property/a house in this area, do you have a more accurate map which can show me if it floods in that area?
A: With the accuracy of 90x90 meters for each hazard area, it is too big to ascertain if a lot or house is in danger of flooding. The best course of action is to ask the residents there if it floods in the area, or inspect yourself if there may be causes for flooding in the area (clogged canals, nearby creeks, etc.)

Q: The street name of insert street here is wrong. It should be...
A: The map is courtesy of Google Maps, and therefore we have no control over what appears on the map except for the colored squares which represents flood hazards.