Best reference material to explain floodway modeling?

[beej67]

Is the HEC-RAS documentation adequate, or are there other sources as or more important to read and understand? I have a project coming up where I'll be taking a floodplain model and doing a floodway analysis on it, among other tasks.

Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East -

http://www.campbellcivil.com