The paper will be sent to the reviewers for revisions

The paper has improved significantly since the last revision, and the reviewers are happy with the result.
Please clarify with respect to the comments of Reviewer 2
I would separate Table 1 into 2 tables, one for the data used for configuring the model and the other with the data used for calibrating the model.
I would separate each item (e.g. instead of having stream discharge and water quality, have 2 separate items). Also, they should mention where the stream discharge and water quality was measured (e.g. outlet or internal stations), possibly relating each item to the calibration stage where it was used.
The table and text should also clarify whether the model was calibrated using only outlet data, or also internal station data. Finally, Figure 1 should list the measurement stations that were actually used for model calibration, possibly cross-referencing with Table 1.