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Standardised Precipitation Evapotranspiration Index time series for Integrated Hydrological Units (1961-2012)

Standardised Precipitation Evapotranspiration Index (SPEI) data for different levels of Integrated Hydrological Units (IHU). SPEI is a drought index based on the probability of occurrence of the Climatic Water Balance (CWB) - which is equivalent to the amount of precipitation minus the amount of evapotranspiration - for a given accumulation period as defined by Vicente-Serrano et al. [2]. SPEI is calculated for different accumulation periods: 1, 3, 6, 12, 18, 24 months. Each of these is in turn

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Non-Open government licence
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16/10/2026
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Provenance & evidence

Listed in ukceh-eidc public catalogue API on 2026-10-16; relevance/value screened (haiku).

Metadata observed 14/10/2026 · research sweep: sweep-2026-10-16 (ukceh-eidc)