Dear @Ulrich,
Yes, I did modify the OF adapter according to the suggestion of Moaxm.
And I was able to run the dam break case with the Help of Kyle Davis.
Later on, it was a matter of fine-tuning the Implicit mapping. 
After this we received a good agreement for the elastic dam break (preCICE).
I actually started the work on this after looking at the LinkedIn postby DHCAE team. 
Edit: Here I have posted the results.