Standardized Precipitation Evapotranspiration Index (SPEI)

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Ali Hassan Hommadi

SPEI

Rajarshi Datta

You can refer the following paper for detailed methodology regarding SPEI estimation: Article Trivariate frequency analysis of droughts using copulas unde...

Ahmed L. Al Budeiri

You can view this website

It contains the required dehydration equation

https://spei.csic.es/home.html