Generating 5 to 100 year flood maps

Discussion created by ms_petrelli on Apr 30, 2010
Latest reply on May 6, 2010 by DBaird-esristaff

I would like to generate a 5, 25, 50 and 100 year flood map of a major river system in my country (Jamaica). I am not sure where to start. I have elevation data, historical data, river shapefiles etc. What would i need to do this in ArcGIS 9.3 and how do I go about doing such maps? I also have Spatial and 3D Analyst extensions. Do i need the HEC software?