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Understanding how catchments respond to change is a central theme of the work of many hydrologists around the world, however, it is fair to say that the vast majority of these studies have focused on water quantity. This study is unique in that it represents a very detailed treatment of how water quality changes due to drought, which is a topic that is becoming ever so important with the rapid changes happening in warming climate for many regions of the world. The authors very cleverly combine both complex models and data-driven analyses to elucidate the effects of extreme drought on river water quality.