This is very simple and the most straightforward flow modeling using HECRAS 5.0 which is capable of hydraulic modeling in 2dimensional space.
The input files are not that much accurate and you may double check it again from the technical aspect. There are different parameters that should be defined and given as input to HECRAS 5.0.
The screen recording was done by the Webinaria program which is a free and open source program.
The background image of the desktop is Berlin, Germany(Source ESA : http://www.esa.int/spaceinimages/cont...)