The main objective of the article is the assessment of both uncertainty in precipitation forcing and in the structure of several land-surface models by simulating hydrological variables. Methodology proceeds by studying the relative differences of three simulated hydrological variables by running five state-of–the-art models each forced by six precipitation datasets of various source. I think there is a strong need of capturing the relative influence of uncertainty from as well the datasets as the model structure to increase efficiency in hydrological predictions for water resources and to explore the possible usefulness of multi-model/multi-forcing ensembles. Therefore, the assessment of integrated structural errors would be an addition to the scientific literature on this topic and would definitely be a topic of interest for HESS audience. The paper is generally wellwritten in an understandable way, and the use of English is good. However, I my view the manuscript in its current state of is yet ready for publication and needs revision before it can be accepted. I hope the authors are willing to modify their manuscript, also taking into account the comments provided here. I feel the paper might benefit from a thorough restructuring to assure the manuscript meets the expected quality for HESS publications. Specific comments of three