Name of Referee: Phil Brunner
Affiliation: School of Chemistry, Physics and Earth Sciences, Flinders University, Adelaide, Australia

Name of Referee: Heejun Chang
Affiliation: Department of Geography, Portland State University, Oregon, United States

Name of Referee: Matt Davison
Affiliation: Department of Applied Mathematics, University of Toronto, Canada

Name of Referee: Pierre Goovaerts
Affiliation: Biomedware, Ann Arbor, Michigan, United States

Name of Referee: Jonathan R.M. Hosking
Affiliation: Thomas J. Watson Research Center, Yorktown Heights, NY, United States

Name of Referee: Richard Chandler
Affiliation: Department of Statistical Science at University College London, United Kingdom

Nominated by Kieran M. O'Connor, Associate Editor: "Dr. Chandler has a clear grasp of the essentials of the manuscript, his appreciation of the need for the authors to make concessions to the less statistically-tuned-in readership of the journal, and his very detailed list of comments and corrections. "

Name of Referee: Robin Clarke
Affiliation: Institute of Hydraulic Research, Federal University of Rio Grande do Sul, Brazil

Nominated by Kieran M. O'Connor, Associate Editor: "The detailed but incisive reviews of Dr. Clarke are models of the reviewing process."

Name of Referee: Ellen M. Douglas
Affiliation: Environmental, Earth and Ocean Sciences Department, University of Massachusetts, Boston, United States

Nominated by Konstantine P. Georgakakos, Editor: "Dr. Douglas has shown consistently comprehensive and helpful reviews."

Name of Referee: Eric Gaume
Affiliation: Department Water and Environment, Laboratoire Central des Ponts et Chaussées, Paris, France

Nominated by Kieran M. O'Connor, Associate Editory: "Dr. Gaume puts a lot of effort into his reviews, going into great depth, being meticulously fair, and providing real help and advice to the authors on how to improve their manuscripts. Truly excellent reviews!"

Name of Referee: David Cecil Mason
Affiliation: Environmental Systems Science Centre, University of Reading, United Kingdom

Nominated by Ehab Meselhe, Associate Edtior: "Dr. Mason's reviews are timely, comprehensive, detailed and helpful to reach an overall assessment of the manuscript."

Name of Referee: Noah Paul Molotch
Affiliation: Department of Civil and Environmental Engineering, University of California, Los Angeles, United States

Nominated by Konstantine P. Georgakakos, Editor: "The reviews of Dr. Molotch are consistently detailed, incisive, and written to help the authors improve their manuscript."

Name of Referee: Taha Ouarda
Affilication: L'Institut national de la recherche scientifique (INRS), University of Quebec, Canada

Nominated by Demetris Koutsoyiannis, Associate Editor: "Dr. Ouarda's reviews are incisive and comprehensive."

Name of Referee: José Alfredo Vásquez
Affilication: Northwest Hydraulic Consultants, North Vancouver, BC, Canada

Nominated by Ehab Meselhe, Associate Edtior: "Dr. Vasquez' reviews are timely, comprehensive, detailed and helpful to reach an overall assessment of the manuscript."

Name of Referee: Philip Brunner
Affilication: School of Chemistry, Physics and Earth Sciences, Flinders University, Adelaide, Australia

Name of Referee: Meinhard Bayani Cardenas
Affilication: Department of Geological Sciences, University of Texas at Austin

Name of Referee: Griet Heuvelmans
Affilication: Vlaamse Milieumaatschappij, Brussels, Belgium

Name of Referee: John Nieber
Affilication: Department of Bioproducts and Biosystems Engineering, University of Minnesota, Minnesota, USA

Name of Referee: Dan Rosbjerg
Affilication: Technical University of Denmark, Lyngby, Denmark

Name of Referee: Tammo Steenhuis
Affilication: Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York, USA

Name of Referee: Donald Percival
Affiliation: Department of Statistics, University of Washington, United States and Applied Physics Laboratory, University of Washington, Seattle, United States

Name of Referee: Arthur J. Horowitz
Affiliation: U.S. Geological Survey, Atlanta, United States

Name of Referee: Naomi Detenbeck
Affiliation: US Environmental Protection Agency (EPA), Washington, D.C.., United States

Name of Referee: Dawen Yang
Affiliation: Department of Hydraulic Engineering, Tsinghua University, Beijing, China

Name of Referee: Werner Aeschbach-Hertig
Affiliation: Institute of Environmental Physics, University of Heidelberg, Germany