AUTHOR=Mariethoz Gregoire , Gómez-Hernández J. Jaime TITLE=Editorial: Machine Learning for Water Resources JOURNAL=Frontiers in Artificial Intelligence VOLUME=4 YEAR=2021 URL=https://www.frontiersin.org/journals/artificial-intelligence/articles/10.3389/frai.2021.699862 DOI=10.3389/frai.2021.699862 ISSN=2624-8212