Watersheds may not recover from drought

Tim J. Peterson, M. Saft, M. C. Peel, A. John

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)

Abstract

The Millennium Drought (southeastern Australia) provided a natural experiment to challenge the assumption that watershed streamflow always recovers from drought. Seven years after the drought, the runoff (as a fraction of precipitation) had not recovered in 37% of watersheds, and the number of recovered watersheds was not increasing. When recovery did occur, it was not explained by watershed wetness. For those watersheds not recovered, ∼80% showed no evidence of recovering soon, suggesting persistence within a low-runoff state. The post-drought precipitation not going to runoff was found to be likely going to increased evapotranspiration per unit of precipitation. These findings show that watersheds can have a finite resilience to disturbances and suggest that hydrological droughts can persist indefinitely after meteorological droughts.

Original languageEnglish
Pages (from-to)745-749
Number of pages6
JournalScience
Volume372
Issue number6543
DOIs
Publication statusPublished - 14 May 2021

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