By relevant thematic layers, this study means rainfall,
flood plain in the past, terrain elevating, water
block-age, soil drainage capability, and monthly rainfalls,
etc., which were recorded in the geographical
form.
In order to develop the flood model, understanding
and determination of flood causative factors are crucial.
These factors are selected based on the knowledge
acquired from collected during our recent on-site
survey. A public hearing was organized and 100 local
administrative governors, sub-districts headmen, village
chiefs, academic and local representatives in the
area at risk were participated [2]. This information
formed the bases of the overlay functions, constituting
to nine relevant factors, which were sampled and
analyzed on a reference frame, i.e., Digital Elevation
Model (DEM) digitized from elevating contours [2, 4].