I've now looked through the manuscript and the response to reviewers. I think the authors have done a good job of answering reviewers' queries.

I have also gone through the paper carefully. I really like this paper! It is an excellent example of fusing model results with topography and data. The results are very interesting.

I do have a number of questions about the discussion and conclusions. I do suggest one more (optional) model run that I think will make the conclusions stronger (see pdf). But mainly I have queries about the interpretation of the model runs.

My comments and queries are in the pdf. I look forward to reading the revised version.

Thanks for the revisions. Thinks are much clearer now. I have a few minor technical issues remaining before this gets sent to the copyeditors.

I was indeed confused: I thought you used the actual lithology map when you simulated the lithologically heterogeneous sites. I now understand what was done (I think).
Did you try to run the models using the actual lithology values (that is, different K values for each pixel) from the map?

The table is much clearer with the footnotes, but I still find it slightly confusing to have "L_E overbar fixed" in the table. I think it would be clearer to say "L_E = 1" here. Is there a reason that wasn't done?

Also:
Why is it called L_E in many places but in table 3 it is called L_L?
Table 2: commas are used instead of full stops (i.e., the table use the continental European convention instead of English language convention). This needs to be changed

Dear Benjamin and co-authors,

Thank you for working with AE Simon Mudd and his referees during the review and revision process. Due to the ongoing corona virus crisis, Simon has needed some extra time to deal with your manuscript, but we are now ready to accept your work for publication, provided you deal with some last technical issues. These are outlined by the AE, and I request that you deal with them, unless you have good reasons not to. The explanation of how you dealt with lithology may take an extra sntence. The L_E issue may also be clarified briefly. The table notation is a copy editing issue, but it would help to use European convention.

When you have dealt with these last details, your manuscript will be prpared for publication by Copernicus. Please respond to prompts from the publishers without delay, so that the time to publication is kept short.

Thank you for submitting your work to ESurf. I trust that it will get good attention.

Niels Hovius