floodplain delineation and flood management..

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hello friends, has anyone used GIS in floodplain delineation and flood management if yes please share how to do that. What are your experiences.

2 Answers

  1. Below is a simple GIS methodology, the skill is to determine the height to which the water will rise during the event (e.g. 1:100y) one intends to model.
    1).You need good surface elevation data (e.g. LiDAR) to create topographic surface (raster)
    2).Then create water surface profile using hydraulic engineering methodology/software. i.e. expected height to which the water will rise during the specified flood event.
    3).Get the difference between the water surface and land surface to determine the extents of the flood plain for the given event.
    Methodology using ESRI ArcView tools. http://resources.arcgis.com/en/help/main/10.1/index.html#//015w00000062000000

  2. it was useful but ground data is also important