Articles | Volume 20, issue 3
https://doi.org/10.5194/hess-20-1117-2016
https://doi.org/10.5194/hess-20-1117-2016
Research article
 | 
15 Mar 2016
Research article |  | 15 Mar 2016

Multiscale evaluation of the Standardized Precipitation Index as a groundwater drought indicator

Rohini Kumar, Jude L. Musuuza, Anne F. Van Loon, Adriaan J. Teuling, Roland Barthel, Jurriaan Ten Broek, Juliane Mai, Luis Samaniego, and Sabine Attinger

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In a maiden attempt, we performed a multiscale evaluation of the widely used SPI to characterize local- and regional-scale groundwater (GW) droughts using observations at 2040 groundwater wells in Germany and the Netherlands. From this data-based exploratory analysis, we provide sufficient evidence regarding the inability of the SPI to characterize GW drought events, and stress the need for more GW observations and accounting for regional hydrogeological characteristics in GW drought monitoring.