How to map flood areas from a set of points containing surface and height of water?

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I am working on the damages made by the typhoon Haiyan. I use QGIS 2.0 with extensions and toolbox, and MapInfo. I have vectors, rasters of the place.

I want to map the flood area along the coastline with analyze of the height of water. The picture below shows a result approaching what i would like to obtain



Beside i have a set of 70 points, with long/lat, area inundation, height of water



that are represented on this map



I suppose that a Satellite image has been used to get the points.

My questions are:


  1. is it possible to represent the areas of inundation with the attributes in the table?
  2. If no, what is the method they could have used ? (may be not easy to guess it!)
  3. If yes, what is the method to proceed?
Anyone has an idea ? Thanks a lot for your help:)



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