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The authors of this paper provide a valuable discussion on the potential dangers of conduit skeletonization and subcatchment aggregation. For assessing these potential dangers, a "base model" (includes all sewers, nodes, inlets and gutters) and simplified models (successive removal of elements) of two catchments were used. The discussers congratulate the authors for their work on this relevant issue and for presenting their results in a clear and well organized way. The discussers however would like to raise some questions and comments regarding the results and their interpretation as presented in the paper.

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This is an author-produced, peer-reviewed version of this article. The final, definitive version of this document can be found online at Journal of Hydrologic Engineering, published by American Society of Civil Engineers. Copyright restrictions may apply. DOI: 10.1061/(ASCE)HE.1943-5584.0000184