Dear Fabio Cian and co-authors,

thank you very much again for your submission 'Flood depth estimation by means of high-resolution SAR images and LiDAR data'.
The referees agree that the manuscript is of interest for the readers of NHESS and the flood risk community.

However, combining the reports it appears that a more thorough presentation of the state of the art in SAR based flood mapping is needed and that more details on how your method differs from those already published are required. In this context, please include Cohen et al. (2017) in this list of additional references. Furthermore, the description of the flood event dynamics in the three study areas apparently needs some improvement.

Your responses seem to take-up most of the constructive comments of the referees and will allow to present your approach and results more clear. I think a further elaboration of the differences between your approach and the existing body of literature is essential.
In addition to the reviewer comments I would like to ask you to provide some quantitative information regarding the sensitivity of the assumptions made in your procedure on the results. What are the limitations of these assumptions? How does the vertical accuracy of the underlying DEM affect your results? These sources of uncertainty have to be addressed more clearly in the discussion.

Please follow the guidelines of NHESS to prepare and submit your revision (as .pdf) including (1) comments from referees/public, (2) author's response to each comment one by one, and (3) author's changes in manuscript. Regarding author's changes, a marked-up manuscript version (track changes in Word, latexdiff in LaTeX) converted into a *.pdf. Additionally, you have to upload the new version of the manuscript.

If you have any question regarding the procedure or interpretation of the comments, please do not hesitate to contact me for clarification.

Kind regards,
Kai Schröter

NHESS Editor


Reference:

Cohen, S., Brakenridge, G. R., Kettner, A., Bates, B., Nelson, J., McDonald, R., Huang, Y.-F., Munasinghe, D. and Zhang, J.: Estimating Floodwater Depths from Flood Inundation Maps and Topography, JAWRA Journal of the American Water Resources Association, doi:10.1111/1752-1688.12609, 2017.

Dear Fabio Cian and co-authors,

thank you for the good work on revising the manuscript. I think it is now mature for publication in NHESS. Congratulations!
Reading through the manuscript I have spotted some small technical things which you can find in the annotated pdf-file. Please check if you can correct them.

Best regards
Kai Schröter