The Standardized Precipitation Index (SPI) is a statistical tool used to monitor and assess drought conditions based solely on precipitation data. It measures how rainfall over a specific period deviates from the long-term average and expresses it in standard deviation units. Positive values indicate wet conditions, while negative values indicate drought, with different categories representing drought severity. SPI is widely used in climate analysis and water resources management due to its simplicity and flexibility
Water resources department
Presenter:zhian abdulrahman hamad
Date:17/2/2026
