This is a very interesting and valuable paper for this special issue on transboundary rivers. The authors have benefited from valuable constructive comments by two reviewers, bot of whom wanted more explanation and discussion of the methods used and the results. The authors have also responded positively to these comments and have agreed to do the revisions requested.

Since the revisions requested and proposed are rather substantial, I have decided to seek the opinions of the reviewers one more time. Please submit the revised version as soon as possible and I will endeavor to get it reviewed expeditiously.

I am glad to see that the authors have satisfactorily responded to the concerns and suggestions of the reviewers, and as a result the manuscript is now substantially improved. Both reviewers were positively impressed with the paper in the first round and I do not see any need for the paper to go for another round of reviews. I am therefor recommending that the paper be published in its present form except for one minor technical correction:

I request that wherever the word "nexuses" appears that it be replaced by just "nexus". I do not think nexus has a plural form like this (in my opinion) and it is better to go with "nexus" everywhere.

Congratulations to the authors for an excellent paper and thanks for submitting their paper to the HESS special issue