Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Hydrology was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 13 days and the median time to publication was 39 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Abbaszadeh, Peyman | Lim, Nancy Joy |
| Abdelmohsen, Karem | Lin, Kairong |
| Ahmad, Qurat Ul Ain | Liu, Suning |
| Ahmed, Farzana | Liu, Tie |
| Albert, Carlo | Liu, Zhiyu |
| Albert, Ryan J. | Lončarić, Robert |
| Alexandris, Stavros | López Periago, José Eugenio |
| Al-Muqdadi, Sameh W. | Lorenzo-Lacruz, Jorge |
| Andrieu, Hervé | Loukas, Athanasios |
| Antunes Do Carmo, José Simão | Lozano Baez, Sergio Esteban |
| Apollonio, Ciro | Lušić Vukić, Darija |
| Arampatzis, George | Ma, Fei |
| Arciniega-Esparza, Saúl | Malamos, Nikolaos |
| Aricò, Costanza | Malinowska, Miroslawa |
| Avesani, Diego | Malov, Alexander I. |
| Bak, Lukasz | Manda, Alex K. |
| Barešić, Jadranka | Marino, Pasquale |
| Barsanti, Michele | Marković, Tamara |
| Báťková, Kamila | Maroušková, Anna |
| Beceiro, Paula | MARSALEK, JIRI |
| Belfort, Benjamin | Marteau, Baptiste |
| Bhandari, Swastik | Martinat, Stanislav |
| Bhuiyan, Md Abul Ehsan | Martínez Moreno, Francisco José |
| Biggs, Trent | Mataveli, Guilherme Augusto Verola |
| Blagojević, Borislava | Mazur, Andrzej |
| Bonasia, Rosanna | Mazzarella, Adriano |
| Brancelj, Anton | Mdee, Anna |
| Brauer, Dave | Meaški, Hrvoje |
| Brenner, Mark | Medici, Giacomo |
| Burlakovs, Juris | Mehan, Sushant |
| Busico, Gianluigi | Meron, Moshe |
| Cai, Fei | Mesa, Oscar |
| Calligaris, Chiara | Meshesha, Tesfa Worku |
| Capoccioni, Fabrizio | Mester, Tamás |
| Carlson, Cynthia | Miličić, Dragana |
| Carmen, Mateescu | Miller, Douglas |
| Casadei, Stefano | Minďáš, Jozef |
| Castellini, Mirko | Minea, Ionut |
| Castilho, Ana | Miras-Avalos, Jose Manuel |
| Castro-Gama, Mario | Mirosław-Swiatek, Dorota |
| Catarina Paz, Maria | Mobilia, Mirka |
| Cencur Curk, Barbara | Mohssen, Magdy |
| Cervi, Federico | Montenegro, Abelardo Antônio |
| Chang, Yang-Chi | Mora, Abrahan |
| Chapron, Emmanuel | Moreta, Pedro Jose Martin |
| Charizopoulos, Nikos | Mrokowska, Magdalena |
| Chau, Kwok-wing | MURĂRESCU, Ovidiu-Marcel |
| Chen, Chia-Jeng | Muresan, Iulia Cristina |
| Chen, Jui-Sheng | NABIL, BACHAGHA |
| Chen, Wan-Jiun | Nania, Leonardo |
| Chen, Wenfu | Nardini, Andrea |
| Chiu, Yen-Yu | Nascimento, João |
| Chokmani, Karem | Nazari-Sharabian, Mohammad |
| Chowdhury, AFM Kamal | Nedjai, Rachid |
| Chun, Sejong | Neto, Susana |
| Ciampittiello, Marzia | Nones, Michael |
| Clark, Elyse | Nooni, Isaac |
| Clark, Jordan F. | Novak, Gorazd |
| Colombo, Loris | Oh, Sungmin |
| Conoscenti, Christian | Oliveira, João M. |
| Contreras-López, Manuel | Oliveto, Giuseppe |
| Costanzo, Carmelina | Ololade, Olusolao |
| Cresswell, Richard | Ortega-Fernández, Francisco |
| Czerniejewski, Przemysław | Ostrowski, Piotr |
| Daneshvar, Fariborz | Pamuković, Jelena Kilić |
| Dariusz, Kowalski | Panagopoulos, Ioannis |
| Darvini, Giovanna | Papalexiou, Simon Michael |
| Dasallas, Lea | Papanicolaou, Panos |
| De Bartolo, Samuele | Park, Edward |
| De La Casa, Antonio | Park, Inhwan |
| De Luca, Davide Luciano | Patlakas, Platon |
| De Vita, Pantaleone | Pavlovskii, Igor |
| Deidda, Roberto | Pedregal Mateos, Belén |
| Del Campo, Jose Maria | Peleg, Nadav |
| Demertzi, Kleoniki | Penn, Roni |
| Deng, Hailin | Petaccia, Gabriella |
| Diakakis, Michalis | Peterson, Eric W. |
| Diego, Fortugno | Petric, Metka |
| Diomede, Tommaso | Plesiński, Karol |
| Dogančić, Dragana | Ponton, Dominique |
| Domingo-Pinillos, Juan Carlos | Pope, Karen L. |
| Doro, Kennedy | Pueppke, Steven |
| Doulgeris, Charalampos | Qin, Dajun |
| Du, Mingyuan | R. Wright, Kenneth |
| Dubinina, Elena | Racetin, Ivana |
| Dumitran, Gabriela Elena | Rafieeinasab, Arezoo |
| Duque, Carlos | Rahmati-Abkenar, Mahboubeh |
| Durán-Díaz, Pamela | Raimondi, Anita |
| Durán-Valsero, Juan José | Ramaswamy, Venkatsundar |
| Đurin, Bojan | Rasmy, Mohamed |
| Eastin, Matthew D. | Reggiani, Paolo |
| Edwini-Bonsu, Stephen | Renken, Albert |
| El Baba, Moustafa | Retalis, Adrianos |
| Escobar Villanueva, Jairo R. | Revollar, Silvana |
| Evangelista, Stefania | Ricard, Simon |
| Fattah, Kazi Parvez | Rodak, Carolyn |
| Feikema, Paul M. | Rodella, Ilaria |
| Fleituch, Tadeusz | Rodino, Steliana |
| Folton, Nathalie | Rodrigo-Ilarri, Javier |
| Foti, Giandomenico | Rodríguez-Blanco, Maria-Luz |
| Fox, Neil I. | Rogers, D. Christopher |
| Frans, Van Geer | Romano, Emanuele |
| Gampe, David | Rose Marco, Delle |
| Ganske, Anette | Rosselló, Joan |
| Garijo, Carlos | Rozos, Evangelos |
| Garrote Revilla, Julio | Rubinato, Matteo |
| Garrote, Julio | Saitoh, Kenji |
| Gąsiorowski, Dariusz | Sandoval-Herazo, Luis Carlos |
| GebreEgziabher, Merhawi | Sapač, Klaudija |
| Georgiou, Pantazis E. | Sapountzis, Marios |
| Ghafouri-Azar, Mona | Savvidis, Υiannis |
| Gharechelou, Saeid | Sbarbati, Chiara |
| Ghosh, Ruchira | Scorzini, Anna Rita |
| Giesche, Alena | Seleznev, Andrian |
| Gilbert, James M. | Senanayake, Indishe |
| Gilja, Gordon | Senay, Gebriel |
| Giudici, Mauro | Serra, Teresa |
| Giudicianni, Carlo | Shang, Songhao |
| Giuliano, Dreossi | Shangguan, Ziheng |
| Gjetvaj, Goran | Shi, Zheming |
| Glavan, Matjaž | Shirahata, Katsushi |
| Godlewska, Joanna | Sidorchuk, Aleksey |
| Golian, Saeed | Simonelli, Andrea |
| Gomiz Pascual, Juan Jesús | Sisto, Nicholas P. |
| Gonzalez-Cao, Jose | Sivasubramanian, Jayahar |
| Goodrich, Gregory B. | Słowik-Opoka, Ewa |
| Gophen, Moshe | Šmejkal, Marek |
| Graf, Renata | Šobr, Miroslav |
| Grzywna, Antoni | Soltesz, Andrej |
| Gualtieri, Paola | Soria Garcia, Juan Miguel |
| Gupta, Lallan P. | Soulis, Konstantinos |
| Gusarov, Artyom | Srivastava, Ankur |
| Habel, Michał | Srivastava, Shubham |
| Haines, Heather | Stavi, Ilan |
| Hajimirzaie, Seyed | Steenhuis, Tammo |
| Hanaeus, Jörgen | Stepanova, N Yu |
| Hasan, Muhammad | Storto, Andrea |
| He, Jianxun (Jennifer) | Stroj, Andrej |
| He, Jianzhou | Stuart-Williams, Hilary |
| He, Yanling | Su, Qingmu |
| Heddam, Salim | Subetto, Dmitry |
| Heidari, Hadi | Sumner, David |
| Herrera-Grimaldi, Pascual | Sweetkind, Donald |
| Horvat, Bojana | Sylaios, Georgios |
| Hsieh, Ping-Cheng | Szatyłowicz, Jan |
| Huang, Huanting | Szczepanek, Robert |
| Huang, Hung-Pin | Szostakiewicz-Hołownia, Marzena |
| Huber, Milosh | Szturc, Jan |
| Ilangakoon, Nayani | Talchabhadel, Rocky |
| Iticescu, Dr. Habil. Catalina | Tanaka, Hitoshi |
| Jasbinsek, John | Tananaev, Nikita |
| Jiang, Jianhua | Tanda, Maria Giovanna |
| Juez, Carmelo | Taupin, Jean Denis |
| Jukić, Damir | Tegos, Aristoteles |
| Kadir, Tariq | Teloglou, Elias |
| Kaletova, Tatiana | Teodoro, Ana Cláudia |
| Kamis, Ahmed Samy | Thornton, Jeffrey A. |
| Kasaraneni, Varun K. | Tichavsky, Radek |
| Kastridis, Aristeidis | Tiwari, Ananda |
| Khujanazarov, Temur | Tokarev, Igor |
| Kim, Dongkyun | Tomaszewski, Edmund |
| Kim, Duk-Min | Toro, Norman |
| Kim, Heejung | Tosunoğlu, Fatih |
| Kim, Hung Soo | Tran, Hoang Viet |
| Kirby, Mac | Tsanakas, Konstantinos |
| Klimaszyk, Piotr | Tseng, HungWei |
| Koh, Eun-Hee | Turan, Jan |
| Kontakiotis, George | Usowicz, Boguslaw |
| Kordana-Obuch, Sabina | Valdés, Rodrigo |
| Kotowski, Andrzej | Van Noordwijk, Meine |
| Kouamé, Amenan Agnès | Velazquez, Juan Alberto |
| Kovačič, Gregor | Vojtek, Matej |
| Križan, Peter | Volpi, Elena |
| Krupińska, Izabela | Vuillaume, Jean-Francois |
| Krvavica, Nino | Wachecka-Kotkowska, Lucyna |
| Krylov, Alexey | Walker, Glen R. |
| Kumar BATAR, Amit | Wang, Jindong |
| Kumar, Pankaj | Wartalska, Katarzyna |
| Kumari, Nikul | Webb, Ryan |
| Labat, David | Weiss, Steven |
| Lang, Štěpán | Whitledge, Terry E. |
| Larson, Erik B. | Wibig, Joanna |
| Larsson, Rolf | Wootton, Brent |
| Laute, Katja | Wrzesiński, Dariusz |
| Lee, Changgu | Yan, Hongxiang |
| Lee, Eui Hoon | Yannopoulos, Emeritus Stavros |
| Lee, Meng-Tsung | Zabłocki, Sebastian |
| Leibensperger, Eric M. | Zamani, Kaveh |
| Leppänen, Leena | Zarzuelo, Carmen |
| Levresse, Gilles | Zevenbergen, Chris |
| Liaw, Shyue-Cherng |
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