Peer review is the driving force of journal development, and reviewers are gatekeepers who ensure that Hydrology maintains its standards for the high quality of its published papers. Thanks to the cooperation of our reviewers, in 2020, the median time to first decision was 13 days and the median time to publication was 38 days. The editors would like to express their sincere gratitude to the following reviewers for their precious time and dedication, regardless of whether the papers were finally published:
| Abeynayaka, Amila | Kuriqi, Alban |
| Addamo, Anna M. | Kuzevič, Štefan |
| Afshar, Mehdi H. | Labat, David |
| Aga, Alemu O. | Labate, Antonino |
| Ahmad, Qurat Ul Ain | Lade, Harshad S. |
| Ahmadi, Behzad | Lang, Štěpán |
| Ahmed, Farzana | Lange, Manfred |
| Akbariyeh, Simin | Lazzari, Maurizio |
| Akmalov, Shamshodbek | Li, Hui |
| Alexakis, Dimitrios E. | Li, Qiang |
| Al-Faraj, Furat | Li, Rui |
| Allen, Melissa Ree | Li, Xiaodong |
| Al-Madhhachi, Abdul-Sahib | Liotta, Marcello |
| Al-mamari, Mahmood M. | Lipiński, Seweryn |
| Al-Murib, Muhanned D. | Litt, Guy |
| Amanambu, Amobichukwu | Liu, Changjun |
| Anderson, Ray | Liu, Jih-Shun |
| Apollaro, Carmine | Liu, Ronghua |
| Apollonio, Ciro | Liu, Tao |
| Argaman, Eli | Liu, Tie |
| Arnone, Elisa | Lo, Kwong Fai Andrew |
| Aryal, Yog | Loukas, Athanasios |
| Atique, Usman | Luque-Espinar, Juan A. |
| Auler, Augusto | Ma, Yaoming |
| Avila, Alvaro Javier | Mahmood, Taufique |
| Aygün, Okan | Mahmud, M. Rizaludin |
| Ayzel, Georgy | Malekian, Arash |
| Baba, Wassim Mohamed | Manfreda, Salvatore |
| Babovic, Vladan | Marinello, Francesco |
| Bailey, Ryan T. | Marteau, Baptiste |
| Bajić, Dragoljub | Martinat, Stanislav |
| Ball, Tom | Mastronuzzi, Giuseppe |
| Baltas, Evangelos | Masumoto, Yukio |
| Barańczuk, Jacek | Mateo-Lázaro, Jesús |
| Barber, Michael Ernest | Matos Silva, Maria |
| Barberes, Gabriel | Mazza, Alessandro |
| Barbieri, Maurizio | McMartin, Dena |
| Barešić, Jadranka | Medici, Giacomo |
| Barsanti, Michele | Mekhonoshin, Aleksey |
| Bazo, Juan | Memon, Muhammad Sohail |
| Beceiro, Paula | Mendoza, Rose Marie O. |
| Beranová, Romana | Michelon, William |
| Birylo, Monika | Miglio, Antonio |
| Blade, Ernest | Millares, Agustín |
| Blanco-Ward, Daniel | Mirás-Avalos, José Manuel |
| Błaś, Marek | Młynski, Dariusz |
| Boavida, Isabel | Mohammadi, Babak |
| Bokuniewicz, Henry J. | Molot, Lewis |
| Bonacci, Ognjen | Morosanu, Gabriela |
| Boudhar, Abdelghani | Muhuri, Arnab |
| Boyce, Scott E. | Musayev, Sardorbek |
| Bray, Erin | Nabil, Bachagha |
| Brilly, Mitja | Najibi, Nasser |
| Bujakowski, Filip | Nania, Leonardo |
| Burlakovs, Juris | Napolitano, Francesco |
| Burt, Peter | Nardi, Fernando |
| Bus, Agnieszka | Nawrot, Adam P. |
| Bustos-Terrones, Yaneth | Nedjai, Rachid |
| Cai, Jialiang | Nertan, Argentina |
| Canales, Fausto | Niaghi, Ali Rashid |
| Capraro, Flavio | Nicolis, Orietta |
| Cash, Benjamin A. | Nicu, Ionut Cristi |
| Cerasoli, Sofia | Nippgen, Fabian |
| Cervi, Federico | Nofal, Salah |
| Chang, Ching-Fu | Oh, Sungmin |
| Chanzy, Andre | Oikonomou, Panagiotis D. |
| Chau, Kwok-Wing | Omani, Nina |
| Chen, Wei-Bo | Onaca, Alexandru |
| Chen, Xi | Onyutha, Charles |
| Cheng, Weiming | Operacz, Agnieszka |
| Chishtie, Farrukh | Ostovari, Yaser |
| Cho, Huidae | Paerl, Hans W. |
| Cho, Younghyun | Pajak, Katarzyna |
| Chou, Eric Ting-Kuei | Palermo, Stefania Anna |
| Chouaib, Wafa | Pan, Jinmei |
| Clara Fava, Maria | Pan, Tsung-Yi |
| Colaiuda, Valentina | Panagoulia, Dionysia |
| Colombo, Loris | Papalexiou, Simon Michael |
| Colombo, Nicola | Park, Daeryong |
| Confesor, Remegio | Park, Mincheol |
| Conticello, Federico Rosario | Parlov, Jelena |
| Costanzo, Carmelina | Partsinevelos, Panagiotis |
| Cüneyd Demirel, Mehmet | Pasculli, Antonio |
| Czerwionka, Krzysztof | Pavlic, Kresimir |
| Da Fonseca, André Ribeiro | Pavlovskii, Igor |
| Dąbrowska, Dominika | Paz, Igor |
| Daneshvar, Fariborz | Pech, Pavel |
| Dang, Thanh Duc | Peña, Carlos |
| Dannowski, Ralf | Peña-Haro, Salvador |
| Darabi, Hamid | Pérez Pastor, Alejandro |
| Dawes, Warrick R. | Petaccia, Gabriella |
| De La Casa, Antonio | Peterson, Eric W. |
| De La Fuente, Alberto | Pfannerstill, Matthias |
| De Lima, Isabel Pedroso | Piacentini, Daniela |
| De Lurdes Dinis, Maria | Piccini, Leonardo |
| De Morais, Marcos Vinicius Bueno | Pisaturo, Giuseppe Roberto |
| De Vita, Pantaleone | Pliakas, Fotios-Konstantinos |
| Deb, Proloy | Pochwat, Kamil |
| Delle Rose, Marco | Polykretis, Christos |
| Demertzi, Kleoniki | Pradhanang, Soni M. |
| Demlie, Molla B. | Principato, Francesca |
| Detert, Martin | Ptak, Mariusz |
| Dhakal, Nirajan | Pueppke, Steven |
| Di Curzio, Diego | Qin, Dajun |
| Di Giuseppe, Dario | Quej, Victor H. |
| Di Matteo, Lucio | Quintanar, Arturo |
| Díaz Delgado, Carlos | Racar, Marko |
| Dietrich, Ottfried | Rajulapati, Chandra Rupa |
| Dimitriadis, Panayiotis | Ramadas, Meenu |
| Dimuccio, Luca | Ramage, Joan |
| Ding, Yongjian | Reza, Arif |
| Do Amaral Cunha, Ana Paula Martins | Rianna, Guido |
| Dobre, Mariana | Ricci, Giovanni Francesco |
| Domingo-Pinillos, Juan Carlos | Rienzi, Eduardo A. |
| Dorea, Caetano | Risch, Eric |
| Dornelles, Fernando | Rodrigo-Clavero, María Elena |
| Doro, Kennedy | Rodrigo-Comino, Jesus |
| Dougherty, Erin | Romano, Emanuele |
| Doulgeris, Charalampos | Rosso, Maurizio |
| Dragovich, Deirdre | Rozos, Evangelos |
| Duan, Weili | Rubinić, Josip |
| Dubinina, Elena | Ruescas, Ana B. |
| Duffy, Walter G. | Rymuza, Katarzyna |
| Duncan, Emily | Saavedra, Oliver C. |
| Durán-Valsero, Juan José | Saha, Gopal Chandra |
| Đurin, Bojan | Saha, Korak |
| Durowoju, Olatunde S. | Salazar, Juan F. |
| Dvory, Noam Zach | Salvati, Luca |
| Ehsan Bhuiyan, Md Abul | Sample, David |
| Eliades, Marinos | Sampson, David |
| Elosegi, Arturo | Santonastaso, G. F. |
| ElSaadani, Mohamed | Santos, Ricardo |
| Eltarabily, Mohamed | Sapač, Klaudija |
| Escobar, Yesid Carvajal | Sarma, S.S.S. |
| Espinoza, Carlos Zúñiga | Schiattarella, Marcello |
| Essenfelder, Arthur | Schmidt, Sabine |
| Ezzeddine, Zeinab | Scholz, Miklas |
| Faccini, Francesco | Segoni, Samuele |
| Fan, Jinlong | Seidel, Chad |
| Farmer, William H. | Sellami, Haykel |
| Fernández-Aracil, Patricia | Şerban, Gheorghe |
| Fischer, Christine | Shabani, Afshin |
| Fitzgibbon, John | Shangguan, Ziheng |
| Fonley, Morgan | Sheih, Yuch |
| Frappart, Frédéric | Shen, Shui-Long |
| Gadedjisso-Tossou, Agossou | Shoaib, Muhammad |
| Galagedara, Lakshman | Sidle, Roy C. |
| Gampe, David | Sidorchuk, Aleksey |
| Gangrade, Sudershan | Simeone, Vincenzo |
| Ganske, Anette | Simonneaux, Vincent |
| Garee, Khan | Simpson, Greg D. |
| Garrote Revilla, Julio | Skre, Oddvar |
| Gautam, Mahesh | Słowik-Opoka, Ewa |
| Ge, Yingchun | Soldatenko, Sergei A. |
| Gell, Peter A | Song, Xuehang |
| Gentilucci, Matteo | Soto, David X |
| Georgiou, Pantazis E. | Soulis, Konstantinos |
| Ghafouri-Azar, Mona | Spiliotopoulos, Marios |
| Giacometti, Andrea | Sprenger, Christoph |
| Gierlak, Piotr | Springer, Gregory S. |
| Gilewski, Paweł | Stancalie, Gheorghe |
| Gilewski, Paweł Grzegorz | Steenhuis, Tammo |
| Gioia, Andrea | Stepanova, N Yu |
| Gitz, Dennis C. | Stetler, Larry D. |
| Giudicianni, Carlo | Storto, Andrea |
| Golian, Saeed | Strati, Virginia |
| Goodrich, Gregory B. | Struminska-Parulska, Dagmara I. |
| Gorgoglione, Angela | Sudol, Miroslaw |
| Gourbesville, Philippe | Sun, Shanlei |
| Granata, Francesco | Sun, Shuangke |
| Greco, Michele | Szabó-Takács, Beáta |
| Grinevsky, Sergey O | Szafarczyk, Anna |
| Grochowska, Jolanta | Szatyłowicz, Jan |
| Gurwin, Jacek | Szewczak, Kamil |
| Gutiérrez López, Alfonso | Talchabhadel, Rocky |
| Gutierrez Lopez, Jose | Tamaddun, Kazi |
| Hamedi, Amirmasoud | Tanaka, Tomohiro |
| Hanich, Lahoucine | Tananaev, Nikita |
| Harte, Philip T. | Tebakari, Taichi |
| Hatchett, Benjamin J. | Tegegne, Getachew |
| Haver, Darren L. | Telesca, Vito |
| Hawley, Robert | Thornton, James |
| He, Siwei | Thornton, Jeffrey A. |
| He, Yong | Tilak, Amey S. |
| Heddam, Salim | Tomoyoshi, Nishimura |
| Hejduk, Leszek | Toro, Norman |
| Heo, Jun-Haeng | Totaro, Vincenzo |
| Herrera, Miguel Angel | Tucciarelli, Tullio |
| Hewson, Michael | Turconi, Laura |
| Hofman, Jan | Ulloa, Hugo |
| Hong, Nian | Vaittinada Ayar, Pradeebane |
| Horvat, Bojana | Valipour, Mohammad |
| Hosseiny, Hossein | Vecchio, Antonio |
| Høyer Svendsen, Synne | Venetsanou, Panagiota |
| Hsieh, Ping-Cheng | Venkataraman, Kartik |
| Hssaisoune, Mohammed | Veról, Aline |
| Hu, Caihong | Vespasiano, Giovanni |
| Huang, Tianming | Voda, Mihai |
| Hussain, Yawar | Volpi, Elena |
| Hutorowicz, Andrzej | Voutos, Yorghos |
| Iasiello, Marcello | Vyshkvarkova, Elena V. |
| Ioana-Toroimac, Gabriela | Wagner, Beatrice |
| Iosub, Marina | Wallace, Corey |
| Jabbari, Aida | Wannous, Manal |
| Javeed, Nadeem | Wartalska, Katarzyna |
| Jawecki, Bartosz | Wasilkowski, Daniel |
| Jiang, Jianhua | Webster, Clare |
| Jiménez-Madrid, Alberto | Wetzel, Karl-Friedrich |
| Jones, Ian C. | Williams, Gustavious Paul |
| Jones, Norm | Wirmvem, Mengnjo Jude |
| Jost, Anne | Wojciechowski, Tomasz |
| Juana Sirgado, Luis | Woldemariam, Gezahegn Weldu |
| Jukić, Damir | Wolski, Piotr |
| Júnez Ferreira, Hugo Enrique | Wolter, Calvin |
| Kadir, Tariq | Wright, Steven J. |
| Kagone, Stefanie | Wróżyński, Rafał |
| Kałuża, Tomasz | Wu, Shiangjen |
| Kambezidis, Harry | Xu, Ximeng |
| Kamis, Ahmed Samy | Xuan, Yunqing |
| Kanakoudis, Vasilis | Yang, Jeong Seok |
| Kanduč, Tjaša | Yang, Xiaohua |
| Karabil, Sitar | Yannopoulos, Stavros I. |
| Karakouzian, Moses | Yapiyev, Vadim |
| Karleuša, Barbara | Yettella, Vineel |
| Kasperska-Wołowicz, Wiesława | Yi, Shuang |
| Katzourakis, Vasileios | Yin, Xiaobin |
| Kazama, Shinobu | Yin, Zhenliang |
| Kharismalatri, Hefryan Sukma | Yoon, Seong-Sim |
| Kim, Changhwan | Youssef, Ahmed M. |
| Kim, Dongkyun | Yuan, Ruiqiang |
| Kinzel, Carolina | Zamfir, Rares Halbac-Cotoara |
| Klamerus-Iwan, Anna | Zdon, Andy |
| Kochanek, Krzysztof | Zelenakova, Martina |
| Kociuba, Waldemar | Zema, Demetrio Antonio |
| Kolerski, Tomasz | Zeroual, Ayoub |
| Kollet, Stefan | Zhang, Hao |
| Kong, Yanlong | Zhang, Xinxuan |
| Konstantakopoulou, Foteini | Zheng, Xing |
| Križan, Peter | Zheng, Zicheng |
| Kumar, Pankaj | Zhu, Laiyin |
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