HESSD-Manuscript “Technical note: Stage and water width measurement of a mountain stream using a simple time-lapse camera” (HESS 2017-285).

Dear Dr. P. Leduc

Thanks for providing your response to the comments by the reviewers. I think the comments have been well addressed and I add just a few remarks for clarification:

Referee 1:
- It might be that the reviewer wanted to refer to Tsubaki et al. (2012). Please check whether this would make sense.

Referee 2:
- No comment.

Referee 3:
- Please explain more explicitly that the use of the boulder was not an essential feature of the application. Comments by two referees indicate that this was not sufficiently clear.

- Practical aspects of implementation: Many of the comments by referee 3 link to the question of how to use your approach at a different site. I agree with your answers that it is impossible to provide a fully quantitative description of the procedure that can be applied at other locations because the actual numbers are context dependent. Nevertheless, the information you provide in your responses (including the approximate time required to get a site installed and calibrated) is useful information. You may consider to summarize such practical aspects in an additional paragraph. By doing so you may encourage others to take up your method, indeed.

- Please include the figures on the distributions as Supplementary Material and insert the thresholds such that the reader gets a (qualitative) understanding. If I get it right the threshold is simply defined such that you (hardly) have any overlap between water and non-water pixels. You may explicitly mention this as the decision criteria.

Please revise the manuscript according to your response considering my comments above.

Sincerely

Christian Stamm
Editor HESS


References:
Tsubaki, R., Y. Kawahara, Y. Muto and I. Fujita (2012). "New 3-D flow interpolation method on moving ADCP data." Water Resources Research 48(5): 15 p.

Dear Dr. Leduc

thanks for the modification of the manuscript. Please add a proper Title page to the Supplementary Material to get it ready for publication.

Christian Stamm