Journal of Hydrology: Regional Studies (2017) 155–156 Contents lists available at ScienceDirect Journal of Hydrology: Regional Studies journal homepage: www.elsevier.com/locate/ejrh Peer Review Report Peer review report on “Assessment of changes in riverine nitrate in the Sesan, Srepok and Sekong tributaries of the Lower Mekong River Basin” Original Submission 1.1 Recommendation Major Revision Comments to Author: Study area The relations of 3S rivers and 35 basins are unclear How many basins does each river include? line 136 When and where were these values observed? Was daily coldest temperature 19 ◦ C even at the time of average annual temperature 22 ◦ C (Table 1)? line 164–165, Fig Which of nitrate concentration and nitrate nitrogen concentration are these values? Ordinarily, 62 mg/L of nitrate concentration is 14 mg/L of nitrate nitrogen concentration calibration and validation of water discharge, Table How did you decided parameters? Did you use same parameters at eight monitoring stations or same parameters at rivers or different parameters at each monitoring station? How did you simulate the water discharge of 35 rivers? You should explain more detail How did you obtain the meteorology data of the Mekong river basin? calibration of nitrate load Which did you calibrate nitrate concentration or nitrate load? If you calibrated nitrate concentration, please show the results of nitration concentration calibration If you calibrated directly nitrate load, how did you use the water discharge? You should explain more detail method, although you referenced Abbaspour, 2013 Why did not you validate the nitrate load? Table Please use the significant digit more carefully Fig 2, line 158–160 You estimated the water discharge at Siempang and Andoungmeas You should show the nitrate concentration instead of nitrate load, because you did not get the observed nitrate loads of these rivers Fig 2, Fig You should use same unit DOI of the original article:http://dx.doi.org/10.1016/j.ejrh.2016.07.004 2214-5818/$ – see front matter http://dx.doi.org/10.1016/j.ejrh.2016.12.045 156 Peer Review Report / Journal of Hydrology: Regional Studies (2017) 155–156 line 302–310 The economic growth of Cambodia is remarkable during simulation period Did you consider influence of the economic development? 10 line 328–329 Why did the Sekong have a lower correlation? First revision 3.1 Recommendation Accept Comments to the author Not available Takanobu Inoue Toyohashi University of Technology, Architecture and Civil Engineering, 1-1 Tempaku, Hibarigaoka, Toyohashi, Aichi 441-8580, Japan ...156 Peer Review Report / Journal of Hydrology: Regional Studies (20 17) 155–156 line 3 02? ??310 The economic growth of Cambodia is remarkable during simulation period Did you consider in? ??uence of the. .. in? ??uence of the economic development? 10 line 328 – 329 Why did the Sekong have a lower correlation? First revision 3.1 Recommendation Accept Comments to the author Not available Takanobu Inoue Toyohashi... Comments to the author Not available Takanobu Inoue Toyohashi University of Technology, Architecture and Civil Engineering, 1-1 Tempaku, Hibarigaoka, Toyohashi, Aichi 441-8580, Japan